{"id":20642,"date":"2023-05-06T21:58:03","date_gmt":"2023-05-07T01:58:03","guid":{"rendered":"https:\/\/maxtorqueperformance.com\/staging\/?p=20642"},"modified":"2023-05-06T22:08:49","modified_gmt":"2023-05-07T02:08:49","slug":"identifying-unknown-pistons-and-rods-on-the-fly","status":"publish","type":"post","link":"https:\/\/maxtorqueperformance.com\/staging\/index.php\/2023\/05\/06\/identifying-unknown-pistons-and-rods-on-the-fly\/","title":{"rendered":"Identifying Unknown Pistons And Rods On The Fly"},"content":{"rendered":"<div class=\"postie-post\">\n<div>\n<header class=\"entry-header clearfix\" style=\"box-sizing: border-box;        display: block; margin-bottom: 30px; color: rgb(51, 51, 51);        font-family: Arial, sans-serif; font-size: 14px; font-style:        normal; font-variant-ligatures: normal; font-variant-caps: normal;        font-weight: 400; letter-spacing: normal; orphans: 2; text-align:        start; text-indent: 0px; text-transform: none; white-space:        normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width:        0px; text-decoration-thickness: initial; text-decoration-style:        initial; text-decoration-color: initial;\">\n<div class=\"clearfix\" style=\"box-sizing: border-box;\">        <\/div>\n<div class=\"entry-meta\" style=\"box-sizing: border-box; font-size:          14px;\">\n<div class=\"avatar\" style=\"box-sizing: border-box; float: left;            margin-right: 20px; width: 50px; height: 50px;\"><a              href=\"https:\/\/www.streetmusclemag.com\/author\/gregacosta\/\"              class=\"author crop crop-image_290_290\" aria-label=\"Greg              Acosta\" style=\"box-sizing: border-box; background-color:              transparent; color: rgb(51, 122, 183); text-decoration:              none; position: relative; display: block; height: 0px;              padding: 0px 0px 50px; overflow: hidden; border-radius:              50%;\"><img decoding=\"async\"  src=\"https:\/\/www.streetmusclemag.com\/wp-content\/userphoto\/gregacosta.thumbnail.jpg\"                alt=\"gregacosta\" style=\"box-sizing: border-box; border:                0px; vertical-align: middle; object-fit: cover; height:                50px; width: 50px;\" width=\"80\"><\/a><\/div>\n<p>          <span class=\"byline\" style=\"box-sizing: border-box; margin-top:            15px; display: inline-block; color: rgb(89, 89, 89);\">By<span>\u00a0<\/span><span              class=\"author vcard\" style=\"box-sizing: border-box;\"><a                class=\"url fn n\"                href=\"https:\/\/www.streetmusclemag.com\/author\/gregacosta\/\"                style=\"box-sizing: border-box; background-color:                transparent; color: rgb(92, 92, 92); text-decoration:                none; font-weight: 700; text-transform: uppercase;\">GREG                ACOSTA<\/a><\/span><\/span><span>\u00a0<\/span><span            class=\"posted-on\" style=\"box-sizing: border-box; color:            rgb(89, 89, 89); text-transform: uppercase;\">APRIL 28, 2023<\/span><\/div>\n<\/header>\n<div class=\"entry-content\" style=\"box-sizing: border-box; color:        rgb(71, 71, 71); font-size: 16px; line-height: 24px; position:        relative; font-family: Arial, sans-serif; font-style: normal;        font-variant-ligatures: normal; font-variant-caps: normal;        font-weight: 400; letter-spacing: normal; orphans: 2; text-align:        start; text-indent: 0px; text-transform: none; white-space:        normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width:        0px; text-decoration-thickness: initial; text-decoration-style:        initial; text-decoration-color: initial;\">\n<p style=\"box-sizing: border-box; margin: 30px 0px 15px; padding:          0px 20px; line-height: 24px;\">        <\/p>\n<p style=\"box-sizing: border-box; margin: 30px 0px 15px; padding:          0px 20px; line-height: 24px;\">When it comes to this hobby, not          everyone has a spare pile of cash for parts. That often leads to          scouring the internet, swap meets, and junkyards for second-hand          deals on usable parts, like pistons and rods. There\u2019s no shame          in deal-hunting; it\u2019s an interesting hobby where enthusiasts          have to be both good investigators and negotiators. There are          deals to be found, but even the best of deals is a bad deal, if          they are the wrong parts.<\/p>\n<p style=\"box-sizing: border-box; margin: 0px 0px 15px; padding:          0px 20px; line-height: 24px;\">So, we\u2019re not going to even try          and give you negotiation lessons, as in the last few deals we\u2019ve          made, we paid full ask because we needed the parts and didn\u2019t          want to risk losing the deal over a little haggling \u2014 the          antithesis of the deal-hunter\u2019s ethos. But, what we can walk you          through, is how to determine what you\u2019re looking at to help you          get the right parts.<\/p>\n<p style=\"box-sizing: border-box; margin: 0px 0px 15px; padding:          0px 20px; line-height: 24px;\">Generally, when measuring engine          components, you would use the proper micrometers and measure to          the .0001 inch. However, you can identify components with a          simple .001 caliper, as we\u2019ll show here. Plus, it\u2019s a lot easier          to carry a caliper with you, than a 0- to 6-inch mic set. To          demonstrate, we\u2019re going to go through and measure these          \u201cunknown\u201d components from<span>\u00a0<\/span><a href=\"https:\/\/www.jepistons.com\/\" data-id=\"738\" data-type=\"minor\" target=\"_blank\" style=\"box-sizing:            border-box; background-color: transparent; color: rgb(153, 48,            11); text-decoration: none;\" rel=\"noopener\">JE Pistons<\/a><span>\u00a0<\/span>and<span>\u00a0<\/span><a href=\"https:\/\/scatenterprises.com\/\" data-id=\"804\" data-type=\"minor\" target=\"_blank\" style=\"box-sizing:            border-box; background-color: transparent; color: rgb(153, 48,            11); text-decoration: none;\" rel=\"noopener\">SCAT Enterprises<\/a><span>\u00a0<\/span>that          came out of one of our other editor\u2019s semi-mystery engines that          he recently pulled apart.<\/p>\n<section class=\"group-caption group-caption-rendered\"          style=\"box-sizing: border-box; display: block; border: 0px          !important; margin: 10px 0px; background: rgb(255, 255, 255);          max-width: none !important; padding: 0px !important;\">\n<ul class=\"list-attachments thumbnails row-1 clearfix\"            style=\"box-sizing: border-box; margin: 0px 0px 5px; padding:            0px; display: block; line-height: 24px;\">\n<li class=\"thumbnail col-2\" style=\"box-sizing: border-box;              display: block; padding: 0px; margin-bottom: 0px;              line-height: 1.42857; background-color: rgb(255, 255, 255);              border: none; border-radius: 4px; transition: border 0.2s              ease-in-out 0s; float: left; width: 465px; clear: both;\"><a  href=\"https:\/\/www.speednik.com\/files\/2023\/04\/deal-hunting-identifying-an-unknown-piston-and-rod-assembly-2023-04-27_15-48-09_364672-scaled.jpg\"                class=\"group-caption-image-box\"  data-image-mobile=\"https:\/\/www.speednik.com\/files\/2023\/04\/deal-hunting-identifying-an-unknown-piston-and-rod-assembly-2023-04-27_15-48-09_364672-scaled.jpg\"                aria-label=\"Deal Hunting \u2014 Identifying Unknown Pistons And                Rods On The Fly\"                rel=\"shadowbox[sbpost-2462223];player=img;\"                style=\"box-sizing: border-box; background-color:                transparent; color: rgb(153, 48, 11); text-decoration:                none; display: block; padding-right: 5px; border: 0px;\"><img decoding=\"async\"  src=\"https:\/\/www.speednik.com\/files\/2023\/04\/deal-hunting-identifying-an-unknown-piston-and-rod-assembly-2023-04-27_15-48-09_364672-scaled.jpg\"                  alt=\"\" style=\"box-sizing: border-box; border: 0px;                  vertical-align: bottom; display: block; max-width: 100%;                  height: auto; margin: 0px; width: 460px;\"><\/a><\/li>\n<li class=\"thumbnail col-2\" style=\"box-sizing: border-box;              display: block; padding: 0px; margin-bottom: 0px;              line-height: 1.42857; background-color: rgb(255, 255, 255);              border: none; border-radius: 4px; transition: border 0.2s              ease-in-out 0s; float: left; width: 465px;\"><a  href=\"https:\/\/www.speednik.com\/files\/2023\/04\/deal-hunting-identifying-an-unknown-piston-and-rod-assembly-2023-04-27_15-47-59_706859-scaled.jpg\"                class=\"group-caption-image-box\"  data-image-mobile=\"https:\/\/www.speednik.com\/files\/2023\/04\/deal-hunting-identifying-an-unknown-piston-and-rod-assembly-2023-04-27_15-47-59_706859-scaled.jpg\"                aria-label=\"Deal Hunting \u2014 Identifying Unknown Pistons And                Rods On The Fly\"                rel=\"shadowbox[sbpost-2462223];player=img;\"                style=\"box-sizing: border-box; background-color:                transparent; color: rgb(153, 48, 11); text-decoration:                none; display: block; padding-right: 5px; border: 0px;\"><img decoding=\"async\"  src=\"https:\/\/www.speednik.com\/files\/2023\/04\/deal-hunting-identifying-an-unknown-piston-and-rod-assembly-2023-04-27_15-47-59_706859-scaled.jpg\"                  alt=\"\" style=\"box-sizing: border-box; border: 0px;                  vertical-align: bottom; display: block; max-width: 100%;                  height: auto; margin: 0px; width: 460px;\"><\/a><\/li>\n<\/ul>\n<p class=\"wp-caption-text\" style=\"box-sizing: border-box;            margin-top: 20px !important; margin-right: 5px; margin-bottom:            15px; margin-left: 0px; background: 0px 0px; font-size: 16px;            color: rgb(106, 106, 106); font-weight: 700; padding: 10px            10px 10px 15px; text-align: left; line-height: 24px;            border-left: 4px solid rgb(153, 48, 11);\">If you can identify            a part number and a serial number, you might be able to get            specs that way. JE has the ability to look up this combination            and gave us some good information about the parts. However, we            still measured everything because a lot can happen between it            leaving the factory and when you run across it.<\/p>\n<\/section>\n<h3 style=\"box-sizing: border-box; font-family: Roboto, Arial,          sans-serif; font-weight: 500; line-height: 1.1; color: inherit;          margin-top: 20px; margin-bottom: 20px; font-size: 24px;\"><strong            style=\"box-sizing: border-box; font-weight: 700;\">Identifying            Pistons<\/strong><\/h3>\n<p style=\"box-sizing: border-box; margin: 0px 0px 15px; padding:          0px 20px; line-height: 24px;\">To some, the idea of buying a used          piston is akin to buying used underpants, but there are a lot of          pistons on the market that have plenty of life left in them. The          key is to make sure you know what you are looking at and for.          The primary measurement for all pistons is the bore size they          work with, or their diameter. This can be a little bit tricky          and a little bit confusing if you aren\u2019t familiar with measuring          pistons.<\/p>\n<p style=\"box-sizing: border-box; margin: 0px 0px 15px; padding:          0px 20px; line-height: 24px;\">You see, most pistons aren\u2019t          perfectly round, and the crown, which is the spot most would          think to measure, isn\u2019t where you measure a piston\u2019s diameter.          Each manufacturer will specify an exact location of the datum          point, but in general, it\u2019s 90 degrees opposite of the wrist          pin, about half an inch up from the bottom of the skirt. If in          doubt, you can measure various points above and below that          half-inch mark to find the largest point, but it will always be          90 degrees opposite of the wrist pin axis.<\/p>\n<div id=\"attachment_1265486\" class=\"wp-caption alignnone\"          style=\"box-sizing: border-box; max-width: 930px; background: 0px          0px; border: 0px; width: 1450px;\"><a  href=\"https:\/\/www.speednik.com\/files\/2023\/04\/deal-hunting-identifying-an-unknown-piston-and-rod-assembly-2023-04-27_15-52-32_238692.jpg\"            aria-label=\"Deal Hunting \u2014 Identifying Unknown Pistons And            Rods On The Fly\" rel=\"shadowbox[sbpost-2462223];player=img;\"            style=\"box-sizing: border-box; background-color: transparent;            color: rgb(153, 48, 11); text-decoration: none; display:            block;\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-1265486\"              class=\"wp-image-2462228 size-large\"  src=\"https:\/\/www.speednik.com\/files\/2023\/04\/deal-hunting-identifying-an-unknown-piston-and-rod-assembly-2023-04-27_15-52-32_238692-1440x960.jpg\"              alt=\"Identifying pistons\" style=\"box-sizing: border-box;              border: 0px; vertical-align: middle; max-width: 100%;              height: auto; width: 930px;\" width=\"1440\" height=\"960\"><\/a>          <\/p>\n<p id=\"caption-attachment-1265486\" class=\"wp-caption-text\"            style=\"box-sizing: border-box; margin-top: 20px !important;            margin-right: 0px; margin-bottom: 15px; margin-left: 0px;            line-height: 24px; padding-left: 15px; color: rgb(106, 106,            106); font-weight: 700; background: 0px 0px; font-size: 16px;            text-align: left; border-left: 4px solid rgb(153, 48, 11);\">The            datum line for JE pistons is .500-inch above the bottom of the            skirt, 90 degrees from the wrist pin. So we Sharpied the area            and then scribed a line exactly 0.500 inch up.<\/p>\n<\/p><\/div>\n<div class=\"ad responsive-ads clearfix apply-responsive-ads          clearfix with_sidebar select-cluster_2 processed\"          data-banner-count=\"\" data-displayed=\"cluster_2\"          data-group-reponsive=\"desktop\" data-select-cluster=\"cluster_2\"          style=\"box-sizing: border-box; margin-top: 50px; margin-bottom:          50px; margin-left: -30px; width: 990px; padding-left: 0px;          padding-right: 0px; max-width: none;\">\n<div            id=\"sm_billboard_article_cluster_1-cluster_ad--c3-6456cf673e65f\"            class=\"responsive-desktop-adslot cluster_2 size-970-250            size-970-250-1 970x250 sm_billboard_article_cluster_1            formatted cluster cluster-970-250 desktop-adslot            responsive-mapping-refresh\" data-sizes=\"[[970,250]]\"            data-dfp=\"SM_Billboard_Article_Cluster_1\"            data-type=\"sm_billboard_article_cluster_1\"            data-group-screen-size=\"desktop\"            data-google-query-id=\"CMjpl_eM4v4CFa8yTwgdgwIHdw\"            style=\"box-sizing: border-box; text-align: center;            margin-bottom: 0px; max-width: 100%; margin-top: auto;\">\n<div  id=\"google_ads_iframe_\/86903851\/SM_Billboard_Article_Cluster_1_0__container__\"              style=\"box-sizing: border-box; max-width: 100%; display:              inline-block; border: 0pt none;\"><\/div>\n<\/p><\/div>\n<\/p><\/div>\n<p style=\"box-sizing: border-box; margin: 0px 0px 15px; padding:          0px 20px; line-height: 24px;\">Now, the second tricky part of the          diameter measurement is that it won\u2019t match your bore size          exactly. You have to factor in piston-to-wall clearance.          Different piston materials will call for different clearances,          so the actual measurement related to a given bore size will          vary. Knowing these specs is crucial if you are trying to fit an          already finished bore. There\u2019s a little more leeway if you          haven\u2019t done the machine work yet, but you still need to know          that there is a variance there.<\/p>\n<p style=\"box-sizing: border-box; margin: 0px 0px 15px; padding:          0px 20px; line-height: 24px;\">For example, say you were looking          for pistons to fit your 4.030-inch bore. If you were looking for          a set of Hypereutectic pistons, you\u2019d want a piston that          measures in at 4.028 to 4.0285 to achieve the recommended .0015-          to .0020-inch clearance. Conversely, if you were looking for a          2618 piston for that same bore size, you\u2019d want a piston that          measures more closely to 4.025 inches. If you didn\u2019t account for          piston-to-wall clearance in those measurements, and you threw a          caliper on a set of pistons at a yard sale and saw 4.025, you          might pass them up thinking they weren\u2019t the right size for your          project.<\/p>\n<div id=\"attachment_1265485\" class=\"wp-caption alignnone\"          style=\"box-sizing: border-box; max-width: 930px; background: 0px          0px; border: 0px; width: 1450px;\"><a  href=\"https:\/\/www.speednik.com\/files\/2023\/04\/deal-hunting-identifying-an-unknown-piston-and-rod-assembly-2023-04-27_15-52-21_409335.jpg\"            aria-label=\"Deal Hunting \u2014 Identifying Unknown Pistons And            Rods On The Fly\" rel=\"shadowbox[sbpost-2462223];player=img;\"            style=\"box-sizing: border-box; background-color: transparent;            color: rgb(153, 48, 11); text-decoration: none; display:            block;\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-1265485\"              class=\"wp-image-2462227 size-large\"  src=\"https:\/\/www.speednik.com\/files\/2023\/04\/deal-hunting-identifying-an-unknown-piston-and-rod-assembly-2023-04-27_15-52-21_409335-1440x960.jpg\"              alt=\"\" style=\"box-sizing: border-box; border: 0px;              vertical-align: middle; max-width: 100%; height: auto;              width: 930px;\" width=\"1440\" height=\"960\"><\/a>          <\/p>\n<p id=\"caption-attachment-1265485\" class=\"wp-caption-text\"            style=\"box-sizing: border-box; margin-top: 20px !important;            margin-right: 0px; margin-bottom: 15px; margin-left: 0px;            line-height: 24px; padding-left: 15px; color: rgb(106, 106,            106); font-weight: 700; background: 0px 0px; font-size: 16px;            text-align: left; border-left: 4px solid rgb(153, 48, 11);\">Placing            the jaws at the datum point for both lines we got 4.025            inches. While that\u2019s not accurate enough to measure            piston-to-wall clearance, it\u2019s accurate enough to say that            these 2618 pistons are for a 4.030 bore.<\/p>\n<\/p><\/div>\n<h3 style=\"box-sizing: border-box; font-family: Roboto, Arial,          sans-serif; font-weight: 500; line-height: 1.1; color: inherit;          margin-top: 20px; margin-bottom: 20px; font-size: 24px;\"><strong            style=\"box-sizing: border-box; font-weight: 700;\">Beyond Bore            Size<\/strong><\/h3>\n<p style=\"box-sizing: border-box; margin: 0px 0px 15px; padding:          0px 20px; line-height: 24px;\">The next thing to measure is the          wrist pin size. Usually, piston sets will come with wrist pins,          so they will be easy to rough measure \u2013 just throw a caliper on          them and that will tell you what their nominal size is so that          you can match them to your connecting rod. Also, look for a          marking showing the wall-thickness of the wrist pin, or toss the          caliper on it. That spec can be important to your build.<\/p>\n<p style=\"box-sizing: border-box; margin: 0px 0px 15px; padding:          0px 20px; line-height: 24px;\">If the wrist pins aren\u2019t included,          you\u2019ll want to rough measure the diameter of the wrist pin bore          of the piston, again, to make sure they match your rods. If, for          some reason, you are looking at wrist pins by themselves, make          sure you measure the pin\u2019s length as well, as that can vary from          piston to piston, in some designs. If you need a .927-inch          diameter 2.500-inch long pin, a 2.750-inch long wrist pin won\u2019t          do you much good.<\/p>\n<section class=\"group-caption group-caption-rendered\"          style=\"box-sizing: border-box; display: block; border: 0px          !important; margin: 10px 0px; background: rgb(255, 255, 255);          max-width: none !important; padding: 0px !important;\">\n<ul class=\"list-attachments thumbnails row-1 clearfix\"            style=\"box-sizing: border-box; margin: 0px 0px 5px; padding:            0px; display: block; line-height: 24px;\">\n<li class=\"thumbnail col-3\" style=\"box-sizing: border-box;              display: block; padding: 0px; margin-bottom: 0px;              line-height: 1.42857; background-color: rgb(255, 255, 255);              border: none; border-radius: 4px; transition: border 0.2s              ease-in-out 0s; float: left; width: 309.984px;\"><a  href=\"https:\/\/www.speednik.com\/files\/2023\/04\/deal-hunting-identifying-an-unknown-piston-and-rod-assembly-2023-04-27_15-53-40_037384-scaled.jpg\"                class=\"group-caption-image-box\"  data-image-mobile=\"https:\/\/www.speednik.com\/files\/2023\/04\/deal-hunting-identifying-an-unknown-piston-and-rod-assembly-2023-04-27_15-53-40_037384-scaled.jpg\"                aria-label=\"Deal Hunting \u2014 Identifying Unknown Pistons And                Rods On The Fly\"                rel=\"shadowbox[sbpost-2462223];player=img;\"                style=\"box-sizing: border-box; background-color:                transparent; color: rgb(153, 48, 11); text-decoration:                none; display: block; padding-right: 5px; border: 0px;\"><img decoding=\"async\"  src=\"https:\/\/www.speednik.com\/files\/2023\/04\/deal-hunting-identifying-an-unknown-piston-and-rod-assembly-2023-04-27_15-53-40_037384-scaled.jpg\"                  alt=\"\" style=\"box-sizing: border-box; border: 0px;                  vertical-align: bottom; display: block; max-width: 100%;                  height: auto; margin: 0px; width: 304.984px;\"><\/a><\/li>\n<li class=\"thumbnail col-3\" style=\"box-sizing: border-box;              display: block; padding: 0px; margin-bottom: 0px;              line-height: 1.42857; background-color: rgb(255, 255, 255);              border: none; border-radius: 4px; transition: border 0.2s              ease-in-out 0s; float: left; width: 309.984px;\"><a  href=\"https:\/\/www.speednik.com\/files\/2023\/04\/deal-hunting-identifying-an-unknown-piston-and-rod-assembly-2023-04-27_15-53-49_913741-scaled.jpg\"                class=\"group-caption-image-box\"  data-image-mobile=\"https:\/\/www.speednik.com\/files\/2023\/04\/deal-hunting-identifying-an-unknown-piston-and-rod-assembly-2023-04-27_15-53-49_913741-scaled.jpg\"                aria-label=\"Deal Hunting \u2014 Identifying Unknown Pistons And                Rods On The Fly\"                rel=\"shadowbox[sbpost-2462223];player=img;\"                style=\"box-sizing: border-box; background-color:                transparent; color: rgb(153, 48, 11); text-decoration:                none; display: block; padding-right: 5px; border: 0px;\"><img decoding=\"async\"  src=\"https:\/\/www.speednik.com\/files\/2023\/04\/deal-hunting-identifying-an-unknown-piston-and-rod-assembly-2023-04-27_15-53-49_913741-scaled.jpg\"                  alt=\"\" style=\"box-sizing: border-box; border: 0px;                  vertical-align: bottom; display: block; max-width: 100%;                  height: auto; margin: 0px; width: 304.984px;\"><\/a><\/li>\n<li class=\"thumbnail col-3\" style=\"box-sizing: border-box;              display: block; padding: 0px; margin-bottom: 0px;              line-height: 1.42857; background-color: rgb(255, 255, 255);              border: none; border-radius: 4px; transition: border 0.2s              ease-in-out 0s; float: left; width: 309.984px;\"><a  href=\"https:\/\/www.speednik.com\/files\/2023\/04\/deal-hunting-identifying-an-unknown-piston-and-rod-assembly-2023-04-27_15-53-30_443282-scaled.jpg\"                class=\"group-caption-image-box\"  data-image-mobile=\"https:\/\/www.speednik.com\/files\/2023\/04\/deal-hunting-identifying-an-unknown-piston-and-rod-assembly-2023-04-27_15-53-30_443282-scaled.jpg\"                aria-label=\"Deal Hunting \u2014 Identifying Unknown Pistons And                Rods On The Fly\"                rel=\"shadowbox[sbpost-2462223];player=img;\"                style=\"box-sizing: border-box; background-color:                transparent; color: rgb(153, 48, 11); text-decoration:                none; display: block; padding-right: 5px; border: 0px;\"><img decoding=\"async\"  src=\"https:\/\/www.speednik.com\/files\/2023\/04\/deal-hunting-identifying-an-unknown-piston-and-rod-assembly-2023-04-27_15-53-30_443282-scaled.jpg\"                  alt=\"\" style=\"box-sizing: border-box; border: 0px;                  vertical-align: bottom; display: block; max-width: 100%;                  height: auto; margin: 0px; width: 304.984px;\"><\/a><\/li>\n<\/ul>\n<p class=\"wp-caption-text\" style=\"box-sizing: border-box;            margin-top: 20px !important; margin-right: 5px; margin-bottom:            15px; margin-left: 0px; background: 0px 0px; font-size: 16px;            color: rgb(106, 106, 106); font-weight: 700; padding: 10px            10px 10px 15px; text-align: left; line-height: 24px;            border-left: 4px solid rgb(153, 48, 11);\">Finding a part            number on the wrist pin is the easiest way to identify them.            However, measuring OD and length, along with wall thickness is            easy enough with a set of calipers and will get you plenty            close to identify them.<\/p>\n<\/section>\n<p style=\"box-sizing: border-box; margin: 0px 0px 15px; padding:          0px 20px; line-height: 24px;\">Next, we\u2019ll need to determine the          ring package. For rough measurement in a pinch, you can use the          inside jaws on your caliper, but for more precise measurements,          you\u2019ll want to use pin gauges, feeler gauges, or an inside mic.          Not only do you want to measure the size of the top, second, and          oil ring grooves, you\u2019ll want to measure, or at least pay          attention to their spacing and location on the piston, which          might be a concern for your combination.<\/p>\n<div class=\"ad responsive-ads clearfix apply-responsive-ads          clearfix with_sidebar select-cluster_1 processed\"          data-banner-count=\"\" data-displayed=\"cluster_2;cluster_1\"          data-group-reponsive=\"desktop\" data-select-cluster=\"cluster_1\"          style=\"box-sizing: border-box; margin-top: 50px; margin-bottom:          50px; margin-left: -30px; width: 990px; padding-left: 0px;          padding-right: 0px; max-width: none;\">\n<div            id=\"sm_300x250_article_cluster_1-cluster_ad-1-c0-6456cf673e703\"            class=\"responsive-desktop-adslot cluster_1 size-300-250            size-300-250-1 300x250 sm_300x250_article_cluster_1 formatted            cluster cluster-300-250 desktop-adslot\"            data-sizes=\"[[300,250]]\"            data-dfp=\"SM_300x250_Article_Cluster_1\"            data-type=\"sm_300x250_article_cluster_1\"            data-group-screen-size=\"desktop\"            data-google-query-id=\"CJnnl_eM4v4CFZ630QQdrDUGdg\"            style=\"box-sizing: border-box; text-align: right !important;            margin-bottom: 0px; max-width: 100%; float: left; width:            495px; padding: 0px 25px;\">\n<div  id=\"google_ads_iframe_\/86903851\/SM_300x250_Article_Cluster_1_0__container__\"              style=\"box-sizing: border-box; max-width: 100%; display:              inline-block; border: 0pt none;\"><\/div>\n<\/p><\/div>\n<div            id=\"sm_300x250_article_cluster_2-cluster_ad-1-c1-6456cf673e709\"            class=\"responsive-desktop-adslot cluster_1 size-300-250            size-300-250-2 300x250 sm_300x250_article_cluster_2 formatted            cluster cluster-300-250 desktop-adslot\"            data-sizes=\"[[300,250]]\"            data-dfp=\"SM_300x250_Article_Cluster_2\"            data-type=\"sm_300x250_article_cluster_2\"            data-group-screen-size=\"desktop\"            data-google-query-id=\"CJrnl_eM4v4CFZ630QQdrDUGdg\"            style=\"box-sizing: border-box; text-align: left !important;            margin-bottom: 0px; max-width: 100%; float: left; width:            495px; padding: 0px 25px; clear: right;\">\n<div  id=\"google_ads_iframe_\/86903851\/SM_300x250_Article_Cluster_2_0__container__\"              style=\"box-sizing: border-box; max-width: 100%; display:              inline-block; border: 0pt none;\"><\/div>\n<\/p><\/div>\n<\/p><\/div>\n<p style=\"box-sizing: border-box; margin: 0px 0px 15px; padding:          0px 20px; line-height: 24px;\">You\u2019ll also want to note the          compression height of the piston \u2014 the distance between the          center of the wrist pin bore and the crown of the piston. This          measurement, combined with your crankshaft\u2019s stroke and          connecting rod length will determine the piston\u2019s location in          the bore at TDC. If you\u2019re matching to a set of existing rods          and crank, this will be incredibly important.<\/p>\n<section class=\"group-caption group-caption-rendered\"          style=\"box-sizing: border-box; display: block; border: 0px          !important; margin: 10px 0px; background: rgb(255, 255, 255);          max-width: none !important; padding: 0px !important;\">\n<ul class=\"list-attachments thumbnails row-1 clearfix\"            style=\"box-sizing: border-box; margin: 0px 0px 5px; padding:            0px; display: block; line-height: 24px;\">\n<li class=\"thumbnail col-2\" style=\"box-sizing: border-box;              display: block; padding: 0px; margin-bottom: 0px;              line-height: 1.42857; background-color: rgb(255, 255, 255);              border: none; border-radius: 4px; transition: border 0.2s              ease-in-out 0s; float: left; width: 465px; clear: both;\"><a  href=\"https:\/\/www.speednik.com\/files\/2023\/04\/deal-hunting-identifying-an-unknown-piston-and-rod-assembly-2023-04-27_15-59-36_765221-scaled.jpg\"                class=\"group-caption-image-box\"  data-image-mobile=\"https:\/\/www.speednik.com\/files\/2023\/04\/deal-hunting-identifying-an-unknown-piston-and-rod-assembly-2023-04-27_15-59-36_765221-scaled.jpg\"                aria-label=\"Deal Hunting \u2014 Identifying Unknown Pistons And                Rods On The Fly\"                rel=\"shadowbox[sbpost-2462223];player=img;\"                style=\"box-sizing: border-box; background-color:                transparent; color: rgb(153, 48, 11); text-decoration:                none; display: block; padding-right: 5px; border: 0px;\"><img decoding=\"async\"  src=\"https:\/\/www.speednik.com\/files\/2023\/04\/deal-hunting-identifying-an-unknown-piston-and-rod-assembly-2023-04-27_15-59-36_765221-scaled.jpg\"                  alt=\"\" style=\"box-sizing: border-box; border: 0px;                  vertical-align: bottom; display: block; max-width: 100%;                  height: auto; margin: 0px; width: 460px;\"><\/a><\/li>\n<li class=\"thumbnail col-2\" style=\"box-sizing: border-box;              display: block; padding: 0px; margin-bottom: 0px;              line-height: 1.42857; background-color: rgb(255, 255, 255);              border: none; border-radius: 4px; transition: border 0.2s              ease-in-out 0s; float: left; width: 465px;\"><a  href=\"https:\/\/www.speednik.com\/files\/2023\/04\/deal-hunting-identifying-an-unknown-piston-and-rod-assembly-2023-04-27_15-59-25_677238-scaled.jpg\"                class=\"group-caption-image-box\"  data-image-mobile=\"https:\/\/www.speednik.com\/files\/2023\/04\/deal-hunting-identifying-an-unknown-piston-and-rod-assembly-2023-04-27_15-59-25_677238-scaled.jpg\"                aria-label=\"Deal Hunting \u2014 Identifying Unknown Pistons And                Rods On The Fly\"                rel=\"shadowbox[sbpost-2462223];player=img;\"                style=\"box-sizing: border-box; background-color:                transparent; color: rgb(153, 48, 11); text-decoration:                none; display: block; padding-right: 5px; border: 0px;\"><img decoding=\"async\"  src=\"https:\/\/www.speednik.com\/files\/2023\/04\/deal-hunting-identifying-an-unknown-piston-and-rod-assembly-2023-04-27_15-59-25_677238-scaled.jpg\"                  alt=\"\" style=\"box-sizing: border-box; border: 0px;                  vertical-align: bottom; display: block; max-width: 100%;                  height: auto; margin: 0px; width: 460px;\"><\/a><\/li>\n<\/ul>\n<p class=\"wp-caption-text\" style=\"box-sizing: border-box;            margin-top: 20px !important; margin-right: 5px; margin-bottom:            15px; margin-left: 0px; background: 0px 0px; font-size: 16px;            color: rgb(106, 106, 106); font-weight: 700; padding: 10px            10px 10px 15px; text-align: left; line-height: 24px;            border-left: 4px solid rgb(153, 48, 11);\">If you have the            rings on the pistons, measuring the ring pack is            straightforward (left). However, if they are bare pistons,            you&#8217;ll need to measure the ring grooves themselves. Calipers            will get you in the ballpark, but a set of pin gauges or            feeler gauges would be much finer and could identify any wear            more easily.<\/p>\n<\/section>\n<p style=\"box-sizing: border-box; margin: 0px 0px 15px; padding:          0px 20px; line-height: 24px;\">If you\u2019re fitting the rest of the          combo around the pistons you got for a smoking deal, you have a          little more flexibility here. However, you also need to consider          the application as well. If you are going to be feeding tons of          boost to the engine, you don\u2019t want a piston with an          exceptionally small compression height. Conversely, if you\u2019re          looking to turn significant RPM with the engine, you don\u2019t want          a huge, heavy slug in there.<\/p>\n<p style=\"box-sizing: border-box; margin: 0px 0px 15px; padding:          0px 20px; line-height: 24px;\">The last area you need to pay          attention to is the crown of the piston. The first thing is the          valve-relief arrangement. Some pistons have valve reliefs          designed for the valve angles of specific cylinder heads, to the          exclusion of other, potentially more standard valve layouts. The          second thing to pay attention to is the dome volume. The three          main configurations are flat top, dome, and dish (or reverse          dome) pistons.<\/p>\n<div id=\"attachment_1265496\" class=\"wp-caption alignnone\"          style=\"box-sizing: border-box; max-width: 930px; background: 0px          0px; border: 0px; width: 1450px;\"><a  href=\"https:\/\/www.speednik.com\/files\/2023\/04\/deal-hunting-identifying-an-unknown-piston-and-rod-assembly-2023-04-27_15-58-30_915902.jpg\"            aria-label=\"Deal Hunting \u2014 Identifying Unknown Pistons And            Rods On The Fly\" rel=\"shadowbox[sbpost-2462223];player=img;\"            style=\"box-sizing: border-box; background-color: transparent;            color: rgb(153, 48, 11); text-decoration: none; display:            block;\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-1265496\"              class=\"wp-image-2462238 size-large\"  src=\"https:\/\/www.speednik.com\/files\/2023\/04\/deal-hunting-identifying-an-unknown-piston-and-rod-assembly-2023-04-27_15-58-30_915902-1440x960.jpg\"              alt=\"measuring compression height\" style=\"box-sizing:              border-box; border: 0px; vertical-align: middle; max-width:              100%; height: auto; width: 837px;\" width=\"1440\" height=\"960\"><\/a>          <\/p>\n<p id=\"caption-attachment-1265496\" class=\"wp-caption-text\"            style=\"box-sizing: border-box; margin-top: 20px !important;            margin-right: 0px; margin-bottom: 15px; margin-left: 0px;            line-height: 24px; padding-left: 15px; color: rgb(106, 106,            106); font-weight: 700; background: 0px 0px; font-size: 16px;            text-align: left; border-left: 4px solid rgb(153, 48, 11);\">The            compression height of a piston is a very important spec. By            measuring from the crown to the top of the wrist pin bore, and            then adding half the diameter of the wrist pin, you get the            compression height. Compression height plus rod length, plus            half of the crank stroke, subtracted from your block\u2019s deck            height will tell you whether the piston sits in or out of the            hole.<\/p>\n<\/p><\/div>\n<p style=\"box-sizing: border-box; margin: 0px 0px 15px; padding:          0px 20px; line-height: 24px;\">As the name suggests, a flat top          piston is flat, with a 0cc volume (you will want to account for          the volume of any valve reliefs present, however). A dome piston          is one that has material above the crown, designed to reduce the          combustion area and raise compression. A dish piston is the          opposite of a dome piston, where there is a void in the crown of          the piston designed to increase the combustion volume and lower          the compression ratio.<\/p>\n<p style=\"box-sizing: border-box; margin: 0px 0px 15px; padding:          0px 20px; line-height: 24px;\">Measuring the exact dome or dish          volume of a piston is important. Normally that information will          be supplied by the piston manufacturer, but it can be measured          at home. For a dished piston, it\u2019s exactly the same process as          CCing a cylinder head. For a dome piston, it\u2019s the same process          with a little extra math involved, where you calculate the          theoretical volume of a cylinder of fluid, and then subtract the          actual measured volume. The difference is the volume displaced          by the piston\u2019s dome.<\/p>\n<section class=\"group-caption group-caption-rendered\"          style=\"box-sizing: border-box; display: block; border: 0px          !important; margin: 10px 0px; background: rgb(255, 255, 255);          max-width: none !important; padding: 0px !important;\">\n<ul class=\"list-attachments thumbnails row-1 clearfix\"            style=\"box-sizing: border-box; margin: 0px 0px 5px; padding:            0px; display: block; line-height: 24px;\">\n<li class=\"thumbnail col-2\" style=\"box-sizing: border-box;              display: block; padding: 0px; margin-bottom: 0px;              line-height: 1.42857; background-color: rgb(255, 255, 255);              border: none; border-radius: 4px; transition: border 0.2s              ease-in-out 0s; float: left; width: 465px; clear: both;\"><a  href=\"https:\/\/www.speednik.com\/files\/2023\/04\/deal-hunting-identifying-an-unknown-piston-and-rod-assembly-2023-04-27_15-57-42_888877-scaled.jpg\"                class=\"group-caption-image-box\"  data-image-mobile=\"https:\/\/www.speednik.com\/files\/2023\/04\/deal-hunting-identifying-an-unknown-piston-and-rod-assembly-2023-04-27_15-57-42_888877-scaled.jpg\"                aria-label=\"Deal Hunting \u2014 Identifying Unknown Pistons And                Rods On The Fly\"                rel=\"shadowbox[sbpost-2462223];player=img;\"                style=\"box-sizing: border-box; background-color:                transparent; color: rgb(153, 48, 11); text-decoration:                none; display: block; padding-right: 5px; border: 0px;\"><img decoding=\"async\"  src=\"https:\/\/www.speednik.com\/files\/2023\/04\/deal-hunting-identifying-an-unknown-piston-and-rod-assembly-2023-04-27_15-57-42_888877-scaled.jpg\"                  alt=\"\" style=\"box-sizing: border-box; border: 0px;                  vertical-align: bottom; display: block; max-width: 100%;                  height: auto; margin: 0px; width: 460px;\"><\/a><\/li>\n<li class=\"thumbnail col-2\" style=\"box-sizing: border-box;              display: block; padding: 0px; margin-bottom: 0px;              line-height: 1.42857; background-color: rgb(255, 255, 255);              border: none; border-radius: 4px; transition: border 0.2s              ease-in-out 0s; float: left; width: 465px;\"><a  href=\"https:\/\/www.speednik.com\/files\/2023\/04\/deal-hunting-identifying-an-unknown-piston-and-rod-assembly-2023-04-27_15-57-31_899892-scaled.jpg\"                class=\"group-caption-image-box\"  data-image-mobile=\"https:\/\/www.speednik.com\/files\/2023\/04\/deal-hunting-identifying-an-unknown-piston-and-rod-assembly-2023-04-27_15-57-31_899892-scaled.jpg\"                aria-label=\"Deal Hunting \u2014 Identifying Unknown Pistons And                Rods On The Fly\"                rel=\"shadowbox[sbpost-2462223];player=img;\"                style=\"box-sizing: border-box; background-color:                transparent; color: rgb(153, 48, 11); text-decoration:                none; display: block; padding-right: 5px; border: 0px;\"><img decoding=\"async\"  src=\"https:\/\/www.speednik.com\/files\/2023\/04\/deal-hunting-identifying-an-unknown-piston-and-rod-assembly-2023-04-27_15-57-31_899892-scaled.jpg\"                  alt=\"\" style=\"box-sizing: border-box; border: 0px;                  vertical-align: bottom; display: block; max-width: 100%;                  height: auto; margin: 0px; width: 460px;\"><\/a><\/li>\n<\/ul>\n<p class=\"wp-caption-text\" style=\"box-sizing: border-box;            margin-top: 20px !important; margin-right: 5px; margin-bottom:            15px; margin-left: 0px; background: 0px 0px; font-size: 16px;            color: rgb(106, 106, 106); font-weight: 700; padding: 10px            10px 10px 15px; text-align: left; line-height: 24px;            border-left: 4px solid rgb(153, 48, 11);\">CCing a dished            piston was quite easy in this case, since the valve relief            didn&#8217;t break the seal. Measuring dome volume is a little            trickier, but very similar. This piston came out to be a            35.8cc dish. Quick math says that these components, with a            4.100-inch stroke crank, would come in right about 8.8:1            compression. Makes sense for the era this engine was            originally built.<\/p>\n<\/section>\n<div class=\"ad responsive-ads clearfix apply-responsive-ads          clearfix with_sidebar select-cluster_3 processed\"          data-banner-count=\"\"          data-displayed=\"cluster_2;cluster_1;cluster_3\"          data-group-reponsive=\"desktop\" data-select-cluster=\"cluster_3\"          style=\"box-sizing: border-box; margin-top: 50px; margin-bottom:          50px; margin-left: -30px; width: 990px; padding-left: 0px;          padding-right: 0px; max-width: none;\">\n<div            id=\"sm_superbillboard_article_cluster_1-cluster_ad-2-c6-6456cf673e7c7\"            class=\"responsive-desktop-adslot cluster_3 size-970-550            size-970-550-1 970x550 sm_superbillboard_article_cluster_1            formatted cluster cluster-970-550 desktop-adslot            responsive-mapping-refresh\" data-sizes=\"[[970,550]]\"            data-dfp=\"SM_SuperBillboard_Article_Cluster_1\"            data-type=\"sm_superbillboard_article_cluster_1\"            data-group-screen-size=\"desktop\"            data-google-query-id=\"CL6HmPeM4v4CFfqh0QQdqvkDwA\"            style=\"box-sizing: border-box; text-align: center;            margin-bottom: 0px; max-width: 100%;\">\n<div  id=\"google_ads_iframe_\/86903851\/SM_SuperBillboard_Article_Cluster_1_0__container__\"              style=\"box-sizing: border-box; max-width: 100%; display:              inline-block; border: 0pt none;\"><\/div>\n<\/p><\/div>\n<\/p><\/div>\n<h3 style=\"box-sizing: border-box; font-family: Roboto, Arial,          sans-serif; font-weight: 500; line-height: 1.1; color: inherit;          margin-top: 20px; margin-bottom: 20px; font-size: 24px;\"><strong            style=\"box-sizing: border-box; font-weight: 700;\">Measuring            Unknown Rods<\/strong><\/h3>\n<p style=\"box-sizing: border-box; margin: 0px 0px 15px; padding:          0px 20px; line-height: 24px;\">Moving on to the connecting rods,          there are definitely fewer measurements to take, but they are          just as crucial. You aren\u2019t going to be able to determine the          material just by looking at the rod, but you can determine what          rod shape it is, as well as whether it\u2019s a press-fit rod or has          a free-floating brass bushing in it.<\/p>\n<section class=\"group-caption group-caption-rendered\"          style=\"box-sizing: border-box; display: block; border: 0px          !important; margin: 10px 0px; background: rgb(255, 255, 255);          max-width: none !important; padding: 0px !important;\">\n<ul class=\"list-attachments thumbnails row-1 clearfix\"            style=\"box-sizing: border-box; margin: 0px 0px 5px; padding:            0px; display: block; line-height: 24px;\">\n<li class=\"thumbnail col-3\" style=\"box-sizing: border-box;              display: block; padding: 0px; margin-bottom: 0px;              line-height: 1.42857; background-color: rgb(255, 255, 255);              border: none; border-radius: 4px; transition: border 0.2s              ease-in-out 0s; float: left; width: 309.984px;\"><a  href=\"https:\/\/www.speednik.com\/files\/2023\/04\/deal-hunting-identifying-an-unknown-piston-and-rod-assembly-2023-04-27_15-56-30_932101-scaled.jpg\"                class=\"group-caption-image-box\"  data-image-mobile=\"https:\/\/www.speednik.com\/files\/2023\/04\/deal-hunting-identifying-an-unknown-piston-and-rod-assembly-2023-04-27_15-56-30_932101-scaled.jpg\"                aria-label=\"Deal Hunting \u2014 Identifying Unknown Pistons And                Rods On The Fly\"                rel=\"shadowbox[sbpost-2462223];player=img;\"                style=\"box-sizing: border-box; background-color:                transparent; color: rgb(153, 48, 11); text-decoration:                none; display: block; padding-right: 5px; border: 0px;\"><img decoding=\"async\"  src=\"https:\/\/www.speednik.com\/files\/2023\/04\/deal-hunting-identifying-an-unknown-piston-and-rod-assembly-2023-04-27_15-56-30_932101-scaled.jpg\"                  alt=\"\" style=\"box-sizing: border-box; border: 0px;                  vertical-align: bottom; display: block; max-width: 100%;                  height: auto; margin: 0px; width: 304.984px;\"><\/a><\/li>\n<li class=\"thumbnail col-3\" style=\"box-sizing: border-box;              display: block; padding: 0px; margin-bottom: 0px;              line-height: 1.42857; background-color: rgb(255, 255, 255);              border: none; border-radius: 4px; transition: border 0.2s              ease-in-out 0s; float: left; width: 309.984px;\"><a  href=\"https:\/\/www.speednik.com\/files\/2023\/04\/deal-hunting-identifying-an-unknown-piston-and-rod-assembly-2023-04-27_16-28-33_382044-scaled.jpg\"                class=\"group-caption-image-box\"  data-image-mobile=\"https:\/\/www.speednik.com\/files\/2023\/04\/deal-hunting-identifying-an-unknown-piston-and-rod-assembly-2023-04-27_16-28-33_382044-scaled.jpg\"                aria-label=\"Deal Hunting \u2014 Identifying Unknown Pistons And                Rods On The Fly\"                rel=\"shadowbox[sbpost-2462223];player=img;\"                style=\"box-sizing: border-box; background-color:                transparent; color: rgb(153, 48, 11); text-decoration:                none; display: block; padding-right: 5px; border: 0px;\"><img decoding=\"async\"  src=\"https:\/\/www.speednik.com\/files\/2023\/04\/deal-hunting-identifying-an-unknown-piston-and-rod-assembly-2023-04-27_16-28-33_382044-scaled.jpg\"                  alt=\"\" style=\"box-sizing: border-box; border: 0px;                  vertical-align: bottom; display: block; max-width: 100%;                  height: auto; margin: 0px; width: 304.984px;\"><\/a><\/li>\n<li class=\"thumbnail col-3\" style=\"box-sizing: border-box;              display: block; padding: 0px; margin-bottom: 0px;              line-height: 1.42857; background-color: rgb(255, 255, 255);              border: none; border-radius: 4px; transition: border 0.2s              ease-in-out 0s; float: left; width: 309.984px;\"><a  href=\"https:\/\/www.speednik.com\/files\/2023\/04\/deal-hunting-identifying-an-unknown-piston-and-rod-assembly-2023-04-27_15-56-41_764171-scaled.jpg\"                class=\"group-caption-image-box\"  data-image-mobile=\"https:\/\/www.speednik.com\/files\/2023\/04\/deal-hunting-identifying-an-unknown-piston-and-rod-assembly-2023-04-27_15-56-41_764171-scaled.jpg\"                aria-label=\"Deal Hunting \u2014 Identifying Unknown Pistons And                Rods On The Fly\"                rel=\"shadowbox[sbpost-2462223];player=img;\"                style=\"box-sizing: border-box; background-color:                transparent; color: rgb(153, 48, 11); text-decoration:                none; display: block; padding-right: 5px; border: 0px;\"><img decoding=\"async\"  src=\"https:\/\/www.speednik.com\/files\/2023\/04\/deal-hunting-identifying-an-unknown-piston-and-rod-assembly-2023-04-27_15-56-41_764171-scaled.jpg\"                  alt=\"\" style=\"box-sizing: border-box; border: 0px;                  vertical-align: bottom; display: block; max-width: 100%;                  height: auto; margin: 0px; width: 304.984px;\"><\/a><\/li>\n<\/ul>\n<p class=\"wp-caption-text\" style=\"box-sizing: border-box;            margin-top: 20px !important; margin-right: 5px; margin-bottom:            15px; margin-left: 0px; background: 0px 0px; font-size: 16px;            color: rgb(106, 106, 106); font-weight: 700; padding: 10px            10px 10px 15px; text-align: left; line-height: 24px;            border-left: 4px solid rgb(153, 48, 11);\">A rod&#8217;s length is            actually a measurement from the center of the wrist pin to the            center of the crank pin. In order to calculate that, you can            add half of the wrist pin diameter (since we know it from            above), a measurement of the rod main section (left image) and            then half of the big end diameter (center image). As long as            you take both the big end and body length measurements either            with or without the bearing, you&#8217;ll get the right rod length.            Notice in the photo on the right that there is a measurement            with a bearing. That gives us the crank journal diameter.<\/p>\n<\/section>\n<p style=\"box-sizing: border-box; margin: 0px 0px 15px; padding:          0px 20px; line-height: 24px;\">What you can and will need to          measure to identify the rod are the two holes in the rod, and          the distance between them. The first two are relatively          straightforward. Using the inside jaws of a caliper, you can get          a fairly accurate idea of the big end (crank pin) diameter and          the small end (wrist pin) diameter. The next critical component          requires a little bit of math to get.<\/p>\n<p style=\"box-sizing: border-box; margin: 0px 0px 15px; padding:          0px 20px; line-height: 24px;\">Chances are you\u2019ll be using a          six-inch caliper, which means you won\u2019t have the reach to          measure everything in one shot and that\u2019s OK. What you will do          is measure from the top of the rod journal housing to the bottom          of the wrist pin hole. You will then combine that number with          half of the wrist pin diameter and half of the rod journal          diameter. That will give you the center-to-center length of your          connecting rod.<\/p>\n<section class=\"group-caption group-caption-rendered\"          style=\"box-sizing: border-box; display: block; border: 0px          !important; margin: 10px 0px; background: rgb(255, 255, 255);          max-width: none !important; padding: 0px !important;\">\n<ul class=\"list-attachments thumbnails row-1 clearfix\"            style=\"box-sizing: border-box; margin: 0px 0px 5px; padding:            0px; display: block; line-height: 24px;\">\n<li class=\"thumbnail col-2\" style=\"box-sizing: border-box;              display: block; padding: 0px; margin-bottom: 0px;              line-height: 1.42857; background-color: rgb(255, 255, 255);              border: none; border-radius: 4px; transition: border 0.2s              ease-in-out 0s; float: left; width: 465px; clear: both;\"><a  href=\"https:\/\/www.speednik.com\/files\/2023\/04\/deal-hunting-identifying-an-unknown-piston-and-rod-assembly-2023-04-27_15-54-56_618403-scaled.jpg\"                class=\"group-caption-image-box\"  data-image-mobile=\"https:\/\/www.speednik.com\/files\/2023\/04\/deal-hunting-identifying-an-unknown-piston-and-rod-assembly-2023-04-27_15-54-56_618403-scaled.jpg\"                aria-label=\"Deal Hunting \u2014 Identifying Unknown Pistons And                Rods On The Fly\"                rel=\"shadowbox[sbpost-2462223];player=img;\"                style=\"box-sizing: border-box; background-color:                transparent; color: rgb(153, 48, 11); text-decoration:                none; display: block; padding-right: 5px; border: 0px;\"><img decoding=\"async\"  src=\"https:\/\/www.speednik.com\/files\/2023\/04\/deal-hunting-identifying-an-unknown-piston-and-rod-assembly-2023-04-27_15-54-56_618403-scaled.jpg\"                  alt=\"\" style=\"box-sizing: border-box; border: 0px;                  vertical-align: bottom; display: block; max-width: 100%;                  height: auto; margin: 0px; width: 460px;\"><\/a><\/li>\n<li class=\"thumbnail col-2\" style=\"box-sizing: border-box;              display: block; padding: 0px; margin-bottom: 0px;              line-height: 1.42857; background-color: rgb(255, 255, 255);              border: none; border-radius: 4px; transition: border 0.2s              ease-in-out 0s; float: left; width: 465px;\"><a  href=\"https:\/\/www.speednik.com\/files\/2023\/04\/deal-hunting-identifying-an-unknown-piston-and-rod-assembly-2023-04-27_15-54-46_680676-scaled.jpg\"                class=\"group-caption-image-box\"  data-image-mobile=\"https:\/\/www.speednik.com\/files\/2023\/04\/deal-hunting-identifying-an-unknown-piston-and-rod-assembly-2023-04-27_15-54-46_680676-scaled.jpg\"                aria-label=\"Deal Hunting \u2014 Identifying Unknown Pistons And                Rods On The Fly\"                rel=\"shadowbox[sbpost-2462223];player=img;\"                style=\"box-sizing: border-box; background-color:                transparent; color: rgb(153, 48, 11); text-decoration:                none; display: block; padding-right: 5px; border: 0px;\"><img decoding=\"async\"  src=\"https:\/\/www.speednik.com\/files\/2023\/04\/deal-hunting-identifying-an-unknown-piston-and-rod-assembly-2023-04-27_15-54-46_680676-scaled.jpg\"                  alt=\"\" style=\"box-sizing: border-box; border: 0px;                  vertical-align: bottom; display: block; max-width: 100%;                  height: auto; margin: 0px; width: 460px;\"><\/a><\/li>\n<\/ul>\n<p class=\"wp-caption-text\" style=\"box-sizing: border-box;            margin-top: 20px !important; margin-right: 5px; margin-bottom:            15px; margin-left: 0px; background: 0px 0px; font-size: 16px;            color: rgb(106, 106, 106); font-weight: 700; padding: 10px            10px 10px 15px; text-align: left; line-height: 24px;            border-left: 4px solid rgb(153, 48, 11);\">Luckily these rod            bolt tell us almost everything we need to know: Bolt            manufacturer, bolt material, and rod manufacturer. We still            need to measure to find the bolt&#8217;s diameter.<\/p>\n<\/section>\n<p style=\"box-sizing: border-box; margin: 0px 0px 15px; padding:          0px 20px; line-height: 24px;\">The next parameter isn\u2019t          necessarily critical to fitment, but is important to          performance, and that is rod bolt diameter. Simply put the          caliper on the rod bolt and find the diameter. Seems simple, but          if we didn\u2019t include it, invariably someone would point out that          we didn\u2019t address the rod bolts.<\/p>\n<p style=\"box-sizing: border-box; margin: 0px 0px 15px; padding:          0px 20px; line-height: 24px;\">And that\u2019s it. With all those          measurements you will be able to quantify anything without a          part number, that you need to identify. However, that does bring          up the point, that the first thing you should look for on the          mystery parts is a manufacturer and a part or serial number.          Some manufacturers will be able to give you an entire suite of          data based on those numbers alone. Of course, measuring is the          most accurate method, since a lot of things can happen once the          parts leave the warehouse. They are used, after all.<\/p>\n<div class=\"ad responsive-ads clearfix apply-responsive-ads          clearfix with_sidebar select-cluster_1 processed\"          data-banner-count=\"\" data-displayed=\"cluster_1\"          data-group-reponsive=\"desktop\" data-select-cluster=\"cluster_1\"          style=\"box-sizing: border-box; margin-top: 50px; margin-bottom:          50px; margin-left: -30px; width: 990px; padding-left: 0px;          padding-right: 0px; max-width: none;\">\n<div            id=\"sm_300x250_article_cluster_1-cluster_ad-3-c0-6456cf673e868\"            class=\"responsive-desktop-adslot cluster_1 size-300-250            size-300-250-1 300x250 sm_300x250_article_cluster_1 formatted            cluster cluster-300-250 desktop-adslot\"            data-sizes=\"[[300,250]]\"            data-dfp=\"SM_300x250_Article_Cluster_1\"            data-type=\"sm_300x250_article_cluster_1\"            data-group-screen-size=\"desktop\"            data-google-query-id=\"CPOLmPeM4v4CFSS70QQd1mIHWg\"            style=\"box-sizing: border-box; text-align: right !important;            margin-bottom: 0px; max-width: 100%; float: left; width:            495px; padding: 0px 25px;\">\n<div  id=\"google_ads_iframe_\/86903851\/SM_300x250_Article_Cluster_1_1__container__\"              style=\"box-sizing: border-box; max-width: 100%; display:              inline-block; border: 0pt none; width: 300px; height:              250px;\"><\/div>\n<\/p><\/div>\n<div            id=\"sm_300x250_article_cluster_2-cluster_ad-3-c2-6456cf673e878\"            class=\"responsive-desktop-adslot cluster_1 size-300-250            size-300-250-2 300x250 sm_300x250_article_cluster_2 formatted            cluster cluster-300-250 desktop-adslot\"            data-sizes=\"[[300,250]]\"            data-dfp=\"SM_300x250_Article_Cluster_2\"            data-type=\"sm_300x250_article_cluster_2\"            data-group-screen-size=\"desktop\"            data-google-query-id=\"CPSLmPeM4v4CFSS70QQd1mIHWg\"            style=\"box-sizing: border-box; text-align: left !important;            margin-bottom: 0px; max-width: 100%; margin-top: auto; float:            left; width: 495px; padding: 0px 25px;\">\n<div  id=\"google_ads_iframe_\/86903851\/SM_300x250_Article_Cluster_2_1__container__\"              style=\"box-sizing: border-box; max-width: 100%; display:              inline-block; border: 0pt none;\">            <\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>By\u00a0GREG ACOSTA\u00a0APRIL 28, 2023 When it comes to this hobby, not everyone has a spare pile of cash for parts. [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[41],"tags":[],"class_list":["post-20642","post","type-post","status-publish","format-standard","hentry","category-techpost"],"_links":{"self":[{"href":"https:\/\/maxtorqueperformance.com\/staging\/index.php\/wp-json\/wp\/v2\/posts\/20642","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/maxtorqueperformance.com\/staging\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/maxtorqueperformance.com\/staging\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/maxtorqueperformance.com\/staging\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/maxtorqueperformance.com\/staging\/index.php\/wp-json\/wp\/v2\/comments?post=20642"}],"version-history":[{"count":0,"href":"https:\/\/maxtorqueperformance.com\/staging\/index.php\/wp-json\/wp\/v2\/posts\/20642\/revisions"}],"wp:attachment":[{"href":"https:\/\/maxtorqueperformance.com\/staging\/index.php\/wp-json\/wp\/v2\/media?parent=20642"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/maxtorqueperformance.com\/staging\/index.php\/wp-json\/wp\/v2\/categories?post=20642"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/maxtorqueperformance.com\/staging\/index.php\/wp-json\/wp\/v2\/tags?post=20642"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}