{"product_id":"atomic-barra-street-chain-tensioner","title":"Atomic - Barra Street Chain Tensioner","description":"\u003ch2\u003eAtomic - Barra Street Chain Tensioner\u003c\/h2\u003e\n\u003cdiv class=\"atomic-header\"\u003e\n\u003cdiv class=\"atomic-subtitle\"\u003eOEM+ Replacement | Billet Steel Construction\u003c\/div\u003e\n\u003cdiv class=\"atomic-subtitle\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0587\/5548\/1713\/files\/Atomic_Barra_Street_Tensioner_2-2.jpg?v=1788439490\" alt=\"\" width=\"251\" height=\"377\"\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"atomic-section\"\u003e\n\u003cdiv class=\"atomic-grid\"\u003e\n\u003cdiv\u003e\n\u003ch2\u003eA Durable OEM+ Solution\u003c\/h2\u003e\n\u003cp\u003eThe Atomic Barra Street Chain Tensioner is designed as a drop-in OEM+ replacement to offer a significantly more durable and refined solution for factory and performance street applications. Built from Billet Steel, it improves upon the factory design's kinematics, damping, and material strength.\u003c\/p\u003e\n\u003cp\u003eWhile we have heavily improved how the tensioner regulates chain tension and dampens harmonics, it is designed to operate within factory-like parameters. For extreme setups (120+psi oil pressure, 150lbs springs, stage 5 cams, harsh limiters), please see our upcoming\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eAtomic Race Tensioner\u003c\/strong\u003e.\u003c\/p\u003e\n\u003ch2\u003eKey Capabilities\u003c\/h2\u003e\n\u003cul class=\"atomic-list\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eFactory replacement, performance street builds.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOil Pressure Limits:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eTuned for mild increases to factory oil pressure (Recommended Max: 80psi).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDeck Height Limits:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eTolerates +\/- 1mm deck height variations.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0587\/5548\/1713\/files\/Atomic_Barra_Street_Tensioner_7-2.jpg?v=1788439490\" alt=\"\" width=\"262\" height=\"393\"\u003e\u003cbr\u003e\n\u003cdiv class=\"img-caption\"\u003eCNC Billet Steel Body, Piston, and Ratchet.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"atomic-section\"\u003e\n\u003ch2\u003eEngineering Enhancements\u003c\/h2\u003e\n\u003cdiv class=\"atomic-card-grid\"\u003e\n\u003cdiv class=\"atomic-card\"\u003e\n\u003ch3\u003eMaterial \u0026amp; Alignment\u003c\/h3\u003e\n\u003cul class=\"atomic-list\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eBillet Construction:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eBillet steel body, piston, and ratchet for vastly improved tolerances and finish.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRevised Geometry:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eImproved kinematics and orientation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEnlarged Piston:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eIncreased size improves contact surface and tooth size, reducing tensioner tooth wear through better engagement.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"atomic-card\"\u003e\n\u003ch3\u003eDamping \u0026amp; Hydraulics\u003c\/h3\u003e\n\u003cul class=\"atomic-list\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eICV \u0026amp; TFD:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eIntegrated Check Valve \u0026amp; Tuned Flow Damping circuits to enhance absorption of chain whip.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCold Start Flow:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eImproved air bleeding speeds up damping function, especially critical on cold starts.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMain Spring:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eIncreased stiffness aids cold starts on modified engines.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"atomic-card\"\u003e\n\u003ch3\u003eFailsafes \u0026amp; Protection\u003c\/h3\u003e\n\u003cul class=\"atomic-list\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eSingle Tooth Ratchet:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eMuch deeper 90° engagement avoids ratchet float and loss of engagement.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReduced Tooth Count:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003ePrevents 'over-ratchet' which over-extends the piston and forces the guide to absorb chain harmonics.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMechanical Backstop:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThe body acts as a backstop in the event of ratchet or oil supply loss.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOver-extension Protection:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eAdded to avoid piston pump-up and guide\/chain snaps.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"atomic-section\"\u003e\n\u003cdiv class=\"atomic-grid\"\u003e\n\u003cdiv\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0587\/5548\/1713\/files\/Atomic_Barra_Street_Tensioner_6-2.jpg?v=1788439490\" alt=\"\" width=\"280\" height=\"420\"\u003e\u003cbr\u003e\u003cbr\u003e\n\u003cdiv class=\"img-caption\"\u003eIntegrated Check Valve and Billet Ratchet system.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable class=\"spec-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eComponent\u003c\/th\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBody\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCNC Billet Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePiston\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCNC Billet Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRatchet\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCNC EN Billet Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDamping Tech\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eICV (Integrated Check Valve), TFD (Tuned Flow Damping)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eTarget Oil Pressure\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMax 80psi\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRecommended Guide\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eAtomic Billet Street Chain Guide\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"atomic-section\"\u003e\n\u003cdiv class=\"alert-box danger\"\u003e\n\u003ch3\u003e⚠️ CRITICAL WARNINGS\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eDO NOT ADD CLICKS TO THE RATCHET. DO NOT FORCE OUT THE PISTON OR LEVER THE GUIDE. INSTALL THE TENSIONER AND PULL THE PIN ONLY.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eModification of any part of the tensioner voids the warranty. Removal of the check valve system or any other component (other than the retention pin which is removed during install) will void warranty.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"alert-box\"\u003e\n\u003ch3\u003eKnown Setup Limitations\u003c\/h3\u003e\n\u003cul class=\"atomic-list\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh Oil Pressure:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eSetups exceeding 100psi will experience timing system issues and will require our upcoming Race Tensioner.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExtra Tall Deck Height:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eSetups with thick head gaskets and unskimmed blocks\/heads may require guide modification to allow installation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUsage:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eAvoid high RPM with cold oil pressure. Use gentle rev limiters.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"atomic-section\"\u003e\n\u003cdiv class=\"atomic-grid\"\u003e\n\u003cdiv\u003e\n\u003ch3\u003e🔧 Installation Advice\u003c\/h3\u003e\n\u003cul class=\"atomic-list\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eLoctite\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eall mounting bolts.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrime oil system\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eby cranking prior to start to fill the head and tensioner with oil.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNormal Operation:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThe tensioner may make a buzzing noise for several seconds after first start as air bleeds out of the system.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDO NOT\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eattempt to add more tension to the guide manually.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003ch3\u003e🔍 Troubleshooting\u003c\/h3\u003e\n\u003cul class=\"atomic-list\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eCannot install (piston fully in):\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eDeck height is likely out of the designed range. Contact Atomic with your head gasket and head\/block specs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLoud rattle\/tap after first start:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eIf noise persists and worsens with RPM, you may have left the retention pin in behind the ratchet mechanism. The pin MUST be removed prior to startup.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePersistent tapping\/buzzing:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eIf you have good oil feed and the pin is removed, you are likely experiencing normal NVH from the Barra timing system. The Street tensioner improves dynamics, but is limited by other factory chain paths. If the noise sounds abnormal or particularly harsh, it may be the guide hitting the tensioner body. Contact Atomic for advice. \u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Atomic Performance Products","offers":[{"title":"Default Title","offer_id":48824591974645,"sku":null,"price":299.0,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0018\/4257\/7517\/files\/Atomic_Barra_Street_Tensioner_4-2_2000x_c1ec19e1-810c-4d62-9648-29b556e82b3d.jpg?v=1788917098","url":"https:\/\/golebysparts.au\/products\/atomic-barra-street-chain-tensioner","provider":"Goleby's Parts","version":"1.0","type":"link"}