{"id":136629,"date":"2025-04-14T21:59:48","date_gmt":"2025-04-15T04:59:48","guid":{"rendered":"https:\/\/blogv2prod.wpenginepowered.com\/blog\/?p=136629"},"modified":"2025-04-14T21:59:50","modified_gmt":"2025-04-15T04:59:50","slug":"what-is-a-dual-mass-flywheel","status":"publish","type":"post","link":"https:\/\/www.carparts.com\/blog\/what-is-a-dual-mass-flywheel\/","title":{"rendered":"What Is a Dual Mass Flywheel?"},"content":{"rendered":"<!DOCTYPE html PUBLIC \"-\/\/W3C\/\/DTD HTML 4.0 Transitional\/\/EN\" \"http:\/\/www.w3.org\/TR\/REC-html40\/loose.dtd\">\n<html><body><span class=\"span-reading-time rt-reading-time\" style=\"display: block;\"><span class=\"rt-label rt-prefix\">Reading Time: <\/span> <span class=\"rt-time\"> 4<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span><style>.kadence-column136629_26c99e-69 > .kt-inside-inner-col,.kadence-column136629_26c99e-69 > .kt-inside-inner-col:before{border-top-left-radius:0px;border-top-right-radius:0px;border-bottom-right-radius:0px;border-bottom-left-radius:0px;}.kadence-column136629_26c99e-69 > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column136629_26c99e-69 > .kt-inside-inner-col{flex-direction:column;}.kadence-column136629_26c99e-69 > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column136629_26c99e-69 > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column136629_26c99e-69{position:relative;}@media all and (max-width: 1024px){.kadence-column136629_26c99e-69 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column136629_26c99e-69 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column136629_26c99e-69 inner-column-1 qk-look-widget\"><div class=\"kt-inside-inner-col\">\n<div class=\"wp-block-ultimate-post-row ultp-block-9f992e  qk-main-wrap\"><div class=\"ultp-row-wrapper\"><div class=\"ultp-row-content\">\n<div class=\"wp-block-ultimate-post-column ultp-block-c5b179\"><div class=\"ultp-column-wrapper\"><style>.wp-block-kadence-advancedheading.kt-adv-heading136629_a4c6f7-2b, .wp-block-kadence-advancedheading.kt-adv-heading136629_a4c6f7-2b[data-kb-block=\"kb-adv-heading136629_a4c6f7-2b\"]{text-align:center;font-size:20px;font-style:normal;}.wp-block-kadence-advancedheading.kt-adv-heading136629_a4c6f7-2b mark.kt-highlight, .wp-block-kadence-advancedheading.kt-adv-heading136629_a4c6f7-2b[data-kb-block=\"kb-adv-heading136629_a4c6f7-2b\"] mark.kt-highlight{font-family:Inter;font-weight:500;font-style:normal;color:#f76a0c;-webkit-box-decoration-break:clone;box-decoration-break:clone;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}.wp-block-kadence-advancedheading.kt-adv-heading136629_a4c6f7-2b img.kb-inline-image, .wp-block-kadence-advancedheading.kt-adv-heading136629_a4c6f7-2b[data-kb-block=\"kb-adv-heading136629_a4c6f7-2b\"] img.kb-inline-image{width:150px;vertical-align:baseline;}<\/style>\n<div class=\"kt-adv-heading136629_a4c6f7-2b summary-title wp-block-kadence-advancedheading\" data-kb-block=\"kb-adv-heading136629_a4c6f7-2b\"><span>Summary<\/span><\/div>\n\n\n\n<ul class=\"wp-block-list\">\n<li>A dual mass flywheel has two separate flywheels that come with their own damper springs, friction material, and ball bearings, which allow them to move independently.<\/li>\n\n\n\n<li>Gear trouble and excessive vibration are the most common symptoms of a failing flywheel. In most cases, the symptoms of a failing flywheel are likened to a slipping clutch.<\/li>\n\n\n\n<li>Overheating and contamination can cause the flywheel to wear out faster than its intended service life.<\/li>\n<\/ul>\n<\/div><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n\n\n\n\n<p>A <a href=\"https:\/\/www.carparts.com\/search?q=dual_mass_flywheel\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Dual Mass Flywheel\">Dual Mass Flywheel<\/a> dampens engine vibrations and prevents them from being transmitted to the passenger compartment via the transmission and shift linkage.<\/p>\n\n\n\n<p>This type of flywheel setup is often found in high-performance and diesel-powered engines.<\/p>\n\n\n\n<p>A dual mass flywheel has two separate flywheels that come with their own damper springs, friction material, and ball bearings, which allow them to move independently.<\/p>\n\n\n\n<p>By allowing some sort of movement to exist between the two flywheels, the damper is able to absorb engine torque peaks and normal vibration, resulting in a smooth drivetrain operation.<\/p>\n\n\n\n<p>In a dual mass flywheel setup, the two flywheels twist out of phase by as much as 60 degrees. This is what allows the system to absorb torsional oscillations.<\/p>\n\n\n\n<p>The entire damper assembly in a dual mass flywheel is completely sealed.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">The Flywheel Explained<\/h2>\n\n\n\n<p>A <a href=\"https:\/\/www.carparts.com\/flywheel\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"flywheel\">flywheel<\/a> is a heavy plate that helps create inertia. As the crankshaft speeds up while a cylinder fires, internal engine friction causes the crankshaft to slow down while waiting for the cylinder to fire again.<\/p>\n\n\n\n<p>The flywheel provides inertia to help the crankshaft maintain a constant speed.<\/p>\n\n\n\n<p>It also plays a part in absorbing heat due to clutch operation by acting as a heat sink for the clutch friction disc.<\/p>\n\n\n\n<p>Generally, the four major roles of a flywheel include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Smooth out or dampen engine power pulses<\/li>\n\n\n\n<li>Absorb heat from clutch operation<\/li>\n\n\n\n<li>Create a connection point that permits the starter motor to crank the engine<\/li>\n\n\n\n<li>Serve as an application surface for the clutch friction disc<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Dual Mass vs. Single Mass Flywheel<\/h2>\n\n\n\n<p>Aside from the number of flywheels, there are other ways to differentiate a single mass from a dual mass flywheel.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Efficiency<\/h3>\n\n\n\n<p>While a single mass flywheel is great for quicker engine revving and frequent gear changes, it&rsquo;s not as effective as a dual mass flywheel when it comes to reducing noise and vibrations.<\/p>\n\n\n\n<p>In addition, having a dual mass flywheel allows for smoother engine operation, improving overall fuel economy.<\/p>\n\n\n\n\n\n\n<h3 class=\"wp-block-heading\">Application<\/h3>\n\n\n\n<p>As mentioned, large vehicles with diesel engines and a manual transmission usually have a dual mass flywheel setup. There are, however, some petrol cars that also come with dual mass flywheels.<\/p>\n\n\n\n<p>Meanwhile, single mass flywheels are usually found in racing engines and off-road vehicles.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Durability<\/h3>\n\n\n\n<p>Both flywheel setups are equally durable, but a single mass flywheel has a bit of an advantage.<\/p>\n\n\n\n<p>A single mass flywheel has a greater thermal and warp resistance than a dual mass flywheel. Also, a single mass flywheel can be resurfaced when needed, so it has a longer service life than its counterpart.<\/p>\n\n\n\n<p>In the case of a dual mass flywheel, its hollow design makes it more susceptible to heat-related warping than a single mass flywheel.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Cost<\/h3>\n\n\n\n<p>Given the complex design of a dual mass flywheel, it can be quite expensive to replace. You&rsquo;ll also need to replace the entire assembly, unlike a single mass flywheel.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Bad Flywheel Symptoms<\/h2>\n\n\n\n<p>In the case of a damaged dual mass flywheel, symptoms are often likened to a slipping clutch. Once the torque-limiting friction material connecting the primary and secondary flywheels fail, you&rsquo;ll need to replace the entire assembly.<\/p>\n\n\n\n<p>Here are some of the other signs of a bad flywheel.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Gear Trouble<\/h3>\n\n\n\n<p>A slipping flywheel means the gears are slipping, too. A rapid increase in engine speed without an increase in ground speed when shifting gears is a telltale sign of slippage.<\/p>\n\n\n\n<p>A damaged flywheel can also make it difficult for you to switch gears. If left unaddressed, you might not even get out of the driveway.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Burning Smell<\/h3>\n\n\n\n<p>If the flywheel&rsquo;s friction surface gets contaminated, you might get a whiff of something burning in your vehicle. This can also be caused by excessive friction in the clutch.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Excessive Vibration<\/h3>\n\n\n\n<p>Reducing vibrations is one of the main responsibilities of the flywheel, regardless of whether it&rsquo;s a single or dual mass type.<\/p>\n\n\n\n<p>So if you notice that your vehicle is getting more uncomfortable to drive in due to vibrations felt all over the cabin, it might be time to replace your flywheel.<\/p>\n\n\n\n<p>The flywheel is bound to wear out after some time, resulting in discoloration, hairline cracks, or even smeared metal on its surface.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What Causes a Flywheel to Wear Out?<\/h2>\n\n\n\n<p>Aside from age, other factors can cause the flywheel to wear out faster than its intended service life.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Contamination<\/h3>\n\n\n\n<p>Oil or grease contamination can significantly reduce a flywheel&rsquo;s efficiency, as it can cause the flywheel and clutch to slip.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Improper Installation<\/h3>\n\n\n\n<p>Misalignment, imbalance, and inadequate torque can negatively impact the flywheel&rsquo;s performance.<\/p>\n\n\n\n<p>To avoid these issues, it&rsquo;s best to leave flywheel replacement at the hands of an experienced professional. Flywheel replacement might not be the easiest task for an average DIYer, and doing it poorly can result in more issues down the road.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Overheating<\/h3>\n\n\n\n<p>The flywheel can only endure so much. Poor driving practices and car maintenance can accelerate wear on several components, causing the engine to overheat.<\/p>\n\n\n\n<p>When this happens, the flywheel can warp under extreme heat and develop cracks on the surface.<\/p>\n<\/body><\/html>\n","protected":false},"excerpt":{"rendered":"<p><span class=\"span-reading-time rt-reading-time\" style=\"display: block;\"><span class=\"rt-label rt-prefix\">Reading Time: <\/span> <span class=\"rt-time\"> 4<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span>A Dual Mass Flywheel dampens engine vibrations and prevents them from being transmitted to the passenger compartment via the transmission&#8230; <a href=\"https:\/\/www.carparts.com\/blog\/what-is-a-dual-mass-flywheel\/\" rel=\"nofollow\">Read More<\/a><\/p>\n","protected":false},"author":4,"featured_media":136630,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_genesis_hide_title":false,"_genesis_hide_breadcrumbs":false,"_genesis_hide_singular_image":false,"_genesis_hide_footer_widgets":false,"_genesis_custom_body_class":"","_genesis_custom_post_class":"","_genesis_layout":"","footnotes":""},"categories":[52,3747],"tags":[435],"ppma_author":[2607],"class_list":{"0":"post-136629","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-diy","8":"category-engine","9":"tag-flywheel","10":"entry"},"acf":{"adrotate_specific_mobile_ad":"","adrotate_specific_desktop_ad":""},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>What Is a Dual Mass Flywheel? - In The Garage with CarParts.com<\/title>\n<meta name=\"description\" content=\"Read all about the dual mass flywheel and how it differs from a single mass one in this article.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.carparts.com\/blog\/what-is-a-dual-mass-flywheel\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"What Is a Dual Mass Flywheel? - In The Garage with CarParts.com\" \/>\n<meta property=\"og:description\" content=\"Read all about the dual mass flywheel and how it differs from a single mass one in this article.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.carparts.com\/blog\/what-is-a-dual-mass-flywheel\/\" \/>\n<meta property=\"og:site_name\" content=\"In The Garage with CarParts.com\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/carpartscom\" \/>\n<meta property=\"article:published_time\" content=\"2025-04-15T04:59:48+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-04-15T04:59:50+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2025\/04\/dual-mass-flywheel-explained.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"2048\" \/>\n\t<meta property=\"og:image:height\" content=\"1364\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@carpartscom\" \/>\n<meta name=\"twitter:site\" content=\"@carpartscom\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"5 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/what-is-a-dual-mass-flywheel\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/what-is-a-dual-mass-flywheel\\\/\"},\"author\":[{\"@type\":\"Person\",\"$id\":\"4\",\"name\":\"CarParts.com Research Team\",\"jobTitle\":\"Expert Automotive Writer\",\"description\":\"The CarParts.com Research Team is composed of experienced automotive and tech writers working with (ASE)-certified automobile technicians and automotive journalists to bring up-to-date, helpful information to car owners in the US. 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