{"id":5372,"date":"2026-09-07T12:47:57","date_gmt":"2026-09-07T12:47:57","guid":{"rendered":"https:\/\/ultrasuonindt.it\/applications\/automotive-and-motorsport\/measuring-engine-cylinder-walls\/"},"modified":"2026-09-17T21:19:48","modified_gmt":"2026-09-17T21:19:48","slug":"measuring-engine-cylinder-walls","status":"publish","type":"page","link":"https:\/\/ultrasuonindt.it\/en\/applications\/automotive-and-motorsport\/measuring-engine-cylinder-walls\/","title":{"rendered":"Measuring engine cylinder walls"},"content":{"rendered":"\n<div class=\"wp-block-columns are-vertically-aligned-top is-layout-flex wp-container-core-columns-is-layout-7387b849 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-vertically-aligned-top is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:36%\">\n<figure class=\"wp-block-image size-full has-custom-border\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"700\" height=\"700\" src=\"https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/dakota_ndt-strumenti_di_misura_ad_ultrasuoni-strumento_r9-sonic-tester_presnetazione_prodotto.jpg?resize=700%2C700&#038;ssl=1\" alt=\"Dakota R9 Sonic Tester for measuring cylinder walls\" class=\"wp-image-244 has-border-color\" style=\"border-color:#000000;border-width:1px;border-radius:15px\" srcset=\"https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/dakota_ndt-strumenti_di_misura_ad_ultrasuoni-strumento_r9-sonic-tester_presnetazione_prodotto.jpg?w=700&amp;ssl=1 700w, https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/dakota_ndt-strumenti_di_misura_ad_ultrasuoni-strumento_r9-sonic-tester_presnetazione_prodotto.jpg?resize=300%2C300&amp;ssl=1 300w, https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/dakota_ndt-strumenti_di_misura_ad_ultrasuoni-strumento_r9-sonic-tester_presnetazione_prodotto.jpg?resize=150%2C150&amp;ssl=1 150w\" sizes=\"auto, (max-width: 700px) 100vw, 700px\" \/><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:4%\"><\/div>\n\n\n\n<div class=\"wp-block-column is-vertically-aligned-top is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:60%\">\n<div class=\"wp-block-group has-background is-layout-flow wp-block-group-is-layout-flow\" style=\"border-top-right-radius:6px;border-bottom-right-radius:6px;border-left-color:#225f78;border-left-width:6px;background-color:#ebf1f4;padding-top:24px;padding-right:28px;padding-bottom:24px;padding-left:28px\">\n<p class=\"wp-block-paragraph\" style=\"color:#225f78;font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.408), 18px);font-style:italic;font-weight:400;line-height:1.6\">The question is always the same: <strong>how much material is left<\/strong> between the bore surface and the water jacket. It cannot be seen from outside, it cannot be measured with callipers, and getting it wrong means a failure on the track. <\/p>\n<\/div>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<ul class=\"wp-block-list\" style=\"list-style:none;padding-left:0px;line-height:1.6\"><li style=\"list-style:none\"><strong style=\"color:#225f78\">\u2713<\/strong> Remaining thickness <strong>between liner and water jacket<\/strong><\/li><li style=\"list-style:none\"><strong style=\"color:#225f78\">\u2713<\/strong> Documented decision on <strong>reboring<\/strong><\/li><li style=\"list-style:none\"><strong style=\"color:#225f78\">\u2713<\/strong> Grid of points along <strong>stroke and circumference<\/strong><\/li><li style=\"list-style:none\"><strong style=\"color:#225f78\">\u2713<\/strong> <strong>A-Scan<\/strong> on the RX8-DL to validate the reading on a curved surface<\/li><li style=\"list-style:none\"><strong style=\"color:#225f78\">\u2713<\/strong> <strong>Data logger<\/strong>: the map of the block stays on file<\/li><li style=\"list-style:none\"><strong style=\"color:#225f78\">\u2713<\/strong> <strong>Non-destructive<\/strong> inspection, repeatable at every overhaul<\/li><\/ul>\n<\/div>\n<\/div>\n\n<div style=\"height:28px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n<p class=\"wp-block-paragraph\">A used engine block has a value that depends entirely on an invisible figure. If it has been rebored once too often, the wall left between the bore surface and the water passage may already be at the limit; if it is still untouched, it will take another oversize. From outside the two cases look identical, and no mechanical measurement reaches that position.  <\/p>\n\n<p class=\"wp-block-paragraph\">Ultrasonic measurement settles the matter by resting the probe on the cylinder surface: the time of flight to the water jacket gives the wall thickness directly. Repeating the reading along the <strong>stroke<\/strong> and around the <strong>circumference<\/strong> builds the real profile, which is almost never uniform: core shift in the casting and previous rebores leave some zones thinner than others. <\/p>\n\n<div style=\"height:50px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n<div class=\"wp-block-cover is-light popmake-4066 popmake-739\" style=\"border-width:1px;min-height:250px;aspect-ratio:unset;\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"1200\" height=\"250\" class=\"wp-block-cover__image-background wp-image-727 size-full\" alt=\"\" src=\"https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/banner_technical_support_choose_products.png?resize=1200%2C250&#038;ssl=1\" data-object-fit=\"cover\" srcset=\"https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/banner_technical_support_choose_products.png?w=1200&amp;ssl=1 1200w, https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/banner_technical_support_choose_products.png?resize=300%2C63&amp;ssl=1 300w, https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/banner_technical_support_choose_products.png?resize=1024%2C213&amp;ssl=1 1024w, https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/banner_technical_support_choose_products.png?resize=768%2C160&amp;ssl=1 768w\" sizes=\"auto, (max-width: 1000px) 100vw, 1000px\" \/><span aria-hidden=\"true\" class=\"wp-block-cover__background has-background-dim-30 has-background-dim\" style=\"background-color:#d3d6dc\"><\/span><div class=\"wp-block-cover__inner-container is-layout-constrained wp-container-core-cover-is-layout-15701bb7 wp-block-cover-is-layout-constrained\">\n<p class=\"has-text-align-right has-ti-fg-color is-style-default has-luminous-vivid-amber-color has-text-color has-link-color wp-elements-1 wp-block-paragraph\" style=\"font-size:clamp(21.536px, 1.346rem + ((1vw - 3.2px) * 1.374), 35px);\"><strong>Need help choosing the right product?<\/strong><\/p>\n\n\n\n<div class=\"wp-block-buttons is-content-justification-right is-layout-flex wp-container-core-buttons-is-layout-b507c051 wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button popmake-4066 popmake-739\"><a class=\"wp-block-button__link has-ti-accent-color has-cyan-bluish-gray-background-color has-text-color has-background has-link-color wp-element-button\">Contact us<\/a><\/div>\n<\/div>\n<\/div><\/div>\n\n<div style=\"height:50px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n<p class=\"wp-block-paragraph\">With the model equipped with a data logger that grid is stored and becomes the <strong>map of the block<\/strong>: comparable with other engines, reusable at the next overhaul and attachable to the engine\u2019s documentation when it changes hands. That is the difference between a measurement and a figure that holds its value over time. <\/p>\n\n<h2 class=\"wp-block-heading\" style=\"color:#225f78\">R9 or RX8-DL<\/h2>\n\n<figure class=\"wp-block-table is-style-stripes\"><table class=\"has-fixed-layout\"><thead><tr><th style=\"background-color:#225f78;color:#ffffff;padding:10px\">Feature<\/th><th style=\"background-color:#225f78;color:#ffffff;padding:10px\">Dakota R9<\/th><th style=\"background-color:#225f78;color:#ffffff;padding:10px\">Dakota RX8-DL<\/th><\/tr><\/thead><tbody><tr><td><strong>Thickness measurement<\/strong><\/td><td>Yes<\/td><td>Yes<\/td><\/tr><tr><td><strong>A-Scan display<\/strong><\/td><td>No<\/td><td>Yes<\/td><\/tr><tr><td><strong>Data logger<\/strong><\/td><td>No<\/td><td>Yes<\/td><\/tr><tr><td><strong>Mapping of the block<\/strong><\/td><td>On paper only<\/td><td>Stored in the instrument<\/td><\/tr><tr><td><strong>Typical use<\/strong><\/td><td>Quick check in the workshop<\/td><td>Engine preparation and history<\/td><\/tr><\/tbody><\/table><\/figure>\n\n<h2 class=\"wp-block-heading\" style=\"color:#225f78\">Why the A-Scan matters on a curved surface<\/h2>\n\n<div class=\"wp-block-columns are-vertically-aligned-top is-layout-flex wp-container-core-columns-is-layout-7387b849 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-vertically-aligned-top is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:36%\">\n<figure class=\"wp-block-image size-full has-custom-border\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"680\" height=\"680\" src=\"https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/dakota_ndt-strumenti_di_misura_ad_ultrasuoni-applicazione_con_PMX2-DL-Action-Shot_misura_su_materiale_reale-web-680x680-1.webp?resize=680%2C680&#038;ssl=1\" alt=\"Thickness measurement on a real mechanical component\" class=\"wp-image-957 has-border-color\" style=\"border-color:#000000;border-width:1px;border-radius:15px\" srcset=\"https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/dakota_ndt-strumenti_di_misura_ad_ultrasuoni-applicazione_con_PMX2-DL-Action-Shot_misura_su_materiale_reale-web-680x680-1.webp?w=680&amp;ssl=1 680w, https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/dakota_ndt-strumenti_di_misura_ad_ultrasuoni-applicazione_con_PMX2-DL-Action-Shot_misura_su_materiale_reale-web-680x680-1.webp?resize=300%2C300&amp;ssl=1 300w, https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/dakota_ndt-strumenti_di_misura_ad_ultrasuoni-applicazione_con_PMX2-DL-Action-Shot_misura_su_materiale_reale-web-680x680-1.webp?resize=150%2C150&amp;ssl=1 150w\" sizes=\"auto, (max-width: 680px) 100vw, 680px\" \/><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:4%\"><\/div>\n\n\n\n<div class=\"wp-block-column is-vertically-aligned-top is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:60%\">\n<p class=\"wp-block-paragraph\">Inside a cylinder the geometry does not help: the surface is curved and the opposite wall is not parallel.<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>The <strong>curvature<\/strong> makes coupling the probe more critical<\/li><li>The backwall echo can be <strong>weak or split<\/strong>: without the A-Scan there is no telling<\/li><li>The <strong>internal ribs<\/strong> of the block can generate intermediate echoes<\/li><li>The A-Scan shows <strong>where the gate has locked on<\/strong> and makes it possible to discard a wrong reading<\/li><\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">On a part where an error has consequences on the track, being able to look at the waveform is worth the price of the feature.<\/p>\n<\/div>\n<\/div>\n\n<h2 class=\"wp-block-heading\" style=\"color:#225f78\">Recommended instruments<\/h2>\n\n<figure class=\"wp-block-table is-style-stripes\"><table class=\"has-fixed-layout\"><thead><tr><th style=\"background-color:#225f78;color:#ffffff;padding:10px\">Instrument<\/th><th style=\"background-color:#225f78;color:#ffffff;padding:10px\">Why in this application<\/th><\/tr><\/thead><tbody><tr><td><a href=\"https:\/\/ultrasuonindt.it\/en\/products\/special-instruments\/dakota-rx8-dl-advanced-sonic-tester-with-engine-mapping\/\"><strong>Dakota RX8-DL Sonic Tester<\/strong><\/a><\/td><td>A-Scan and data logger: complete mapping of the block<\/td><\/tr><tr><td><a href=\"https:\/\/ultrasuonindt.it\/en\/products\/special-instruments\/dakota-r9-sonic-tester-for-motorsport-and-racing\/\"><strong>Dakota R9 Sonic Tester<\/strong><\/a><\/td><td>Essential measurement in the workshop, without storage<\/td><\/tr><tr><td><a href=\"https:\/\/ultrasuonindt.it\/en\/products\/thickness-gauges\/dakota-pmx2-dl-precision-gauge-with-a-scan\/\"><strong>Dakota PMX2-DL<\/strong><\/a><\/td><td>When resolution down to 0.001 mm on machined components is needed<\/td><\/tr><tr><td><a href=\"https:\/\/ultrasuonindt.it\/en\/products\/probes-and-accessories\/transducers-for-precision-thickness-gauges\/\"><strong>Dedicated probes<\/strong><\/a><\/td><td>The probe suited to the curvature is part of the solution<\/td><\/tr><\/tbody><\/table><\/figure>\n\n<h2 class=\"wp-block-heading\" style=\"color:#225f78\">Frequently asked questions<\/h2>\n\n<div class=\"schema-faq wp-block-yoast-faq-block\"><div class=\"schema-faq-section\" id=\"faq-question-1757849001000\"><strong class=\"schema-faq-question\">Does the block have to be sectioned in order to measure?<\/strong><p class=\"schema-faq-answer\">No, and that is exactly the point. The block has to be accessible with the probe from inside the cylinder, but it is not cut or sacrificed: the measurement is non-destructive and can be repeated on the same engine at every overhaul. <\/p><\/div><div class=\"schema-faq-section\" id=\"faq-question-1757849002000\"><strong class=\"schema-faq-question\">How many points are needed to map a cylinder?<\/strong><p class=\"schema-faq-answer\">Enough to cover both the stroke and the circumference, because the wall is not uniform: core shift in the casting and previous rebores create thinner zones. The grid is set according to the geometry of the block and to how much margin is being sought. <\/p><\/div><div class=\"schema-faq-section\" id=\"faq-question-1757849003000\"><strong class=\"schema-faq-question\">Does it work on aluminium blocks with fitted liners?<\/strong><p class=\"schema-faq-answer\">It depends on how liner and block are mated: ultrasound does cross the interfaces between different materials, but every transition generates an echo and the result has to be interpreted. The case has to be assessed in practice: tell us the material, the type of liner and the geometry and we will confirm whether the measurement is reliable. <\/p><\/div><\/div>\n\n<p class=\"wp-block-paragraph\">Back to <a href=\"https:\/\/ultrasuonindt.it\/en\/applications\/automotive-and-motorsport\/\">Automotive and Motorsport<\/a>. To choose the Sonic Tester, <a href=\"https:\/\/ultrasuonindt.it\/en\/contact\/\">write to us<\/a> stating the type of block, the material and whether you need the map to be stored. <\/p>\n\n<div class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\">\n<div style=\"height:50px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h5 class=\"wp-block-heading\">Further information and contacts <\/h5>\n\n\n\n<p class=\"has-small-font-size wp-block-paragraph\"><a href=\"http:\/\/www.roder.it\">Systems division and sensor integration partner : www.roder.it<\/a><br\/><a href=\"https:\/\/ultrasuonindt.it\/chi-siamo\/\">More information about RODER SRL : about us<\/a><br\/>Contact for general information : <a href=\"mailto:info@roder.it\">info@roder.it<\/a><br\/>Contact for information about these products : <a href=\"mailto:info@roder.it\">info@roder.it<\/a><\/p>\n\n\n\n<p class=\"has-small-font-size wp-block-paragraph\"><br\/>The information contained on this web page is provided for information purposes only. Although it has been compiled with the utmost care, it does not constitute a contractual offer or a binding commitment to supply. It may contain transcription, translation or typographical errors. For precise and up-to-date information, please contact our company directly.    <\/p>\n\n\n\n<p class=\"has-small-font-size wp-block-paragraph\">Some images on this website have been intentionally generated using Artificial Intelligence (AI). This is because, for many applications and projects, it is not possible to disclose photographs of the installation or of the actual system due to confidentiality agreements, confidentiality clauses and non-disclosure agreements (NDAs). <\/p>\n\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>The question is always the same: how much material is left between the bore surface and the water jacket. It cannot be seen from outside, it cannot be measured with callipers, and getting it wrong means a failure on the track. \u2713 Remaining thickness between liner and water jacket \u2713 Documented decision on reboring \u2713 [&hellip;]<\/p>\n","protected":false},"author":157040980,"featured_media":5373,"parent":3228,"menu_order":1,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_yoast_wpseo_focuskw":"engine cylinder wall measurement","_yoast_wpseo_title":"Engine cylinder wall measurement | Sonic tester for motorsport","_yoast_wpseo_metadesc":"Measurement of the remaining thickness between liner and water jacket on engine blocks with the Dakota R9 and RX8-DL Sonic Testers: mapping and the reboring decision.","_wpcom_ai_launchpad_about_page":false,"_wpcom_ai_launchpad_gallery_page":false,"_wpcom_ai_launchpad_contact_page":false,"_wpcom_ai_launchpad_events_page":false,"_wpcom_ai_launchpad_video_page":false,"_wpcom_ai_launchpad_portfolio_piece":false,"footnotes":""},"class_list":["post-5372","page","type-page","status-publish","has-post-thumbnail","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Engine cylinder wall measurement | Sonic tester for motorsport<\/title>\n<meta name=\"description\" content=\"Measurement of the remaining thickness between liner and water jacket on engine blocks with the Dakota R9 and RX8-DL Sonic Testers: mapping and the reboring decision.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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This page is the starting point: you can enter from\u2026","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"Dakota NDT ultrasonic thickness measurement applications in industry","src":"https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/dakota_ndt-strumenti_di_misura_ad_ultrasuoni-strumento_dakota_applicazioni_misura_spessore-web-1200x1200-1.webp?fit=1200%2C1200&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/dakota_ndt-strumenti_di_misura_ad_ultrasuoni-strumento_dakota_applicazioni_misura_spessore-web-1200x1200-1.webp?fit=1200%2C1200&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/dakota_ndt-strumenti_di_misura_ad_ultrasuoni-strumento_dakota_applicazioni_misura_spessore-web-1200x1200-1.webp?fit=1200%2C1200&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/dakota_ndt-strumenti_di_misura_ad_ultrasuoni-strumento_dakota_applicazioni_misura_spessore-web-1200x1200-1.webp?fit=1200%2C1200&ssl=1&resize=700%2C400 2x, https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/dakota_ndt-strumenti_di_misura_ad_ultrasuoni-strumento_dakota_applicazioni_misura_spessore-web-1200x1200-1.webp?fit=1200%2C1200&ssl=1&resize=1050%2C600 3x"},"classes":[]}],"_links":{"self":[{"href":"https:\/\/ultrasuonindt.it\/en\/wp-json\/wp\/v2\/pages\/5372","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ultrasuonindt.it\/en\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/ultrasuonindt.it\/en\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/ultrasuonindt.it\/en\/wp-json\/wp\/v2\/users\/157040980"}],"replies":[{"embeddable":true,"href":"https:\/\/ultrasuonindt.it\/en\/wp-json\/wp\/v2\/comments?post=5372"}],"version-history":[{"count":5,"href":"https:\/\/ultrasuonindt.it\/en\/wp-json\/wp\/v2\/pages\/5372\/revisions"}],"predecessor-version":[{"id":6508,"href":"https:\/\/ultrasuonindt.it\/en\/wp-json\/wp\/v2\/pages\/5372\/revisions\/6508"}],"up":[{"embeddable":true,"href":"https:\/\/ultrasuonindt.it\/en\/wp-json\/wp\/v2\/pages\/3228"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/ultrasuonindt.it\/en\/wp-json\/wp\/v2\/media\/5373"}],"wp:attachment":[{"href":"https:\/\/ultrasuonindt.it\/en\/wp-json\/wp\/v2\/media?parent=5372"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}