{"product_id":"atomic-barra-street-chain-tensioner","title":"Atomic Barra Street Chain Tensioner","description":"\u003cdiv class=\"atomic-header\"\u003e\n\u003ch1 class=\"atomic-title\"\u003e\u003cspan\u003eAtomic Barra Street Chain Tensioner\u003cbr\u003e\u003c\/span\u003e\u003c\/h1\u003e\n\u003cdiv class=\"atomic-subtitle\"\u003eOEM+ Replacement | Billet Steel Construction\u003c\/div\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 'GRENADE 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\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 \u003cstrong\u003esignificantly more durable and refined solution\u003c\/strong\u003e for factory and performance street applications. \u003cstrong\u003eMachined in Sydney\u003c\/strong\u003e from Billet Steel, it improves upon the factory design's kinematics, damping, and material strength all of which improve load bearing ability and therefore durability.\u003c\/p\u003e\n\u003cp\u003eWhile we have heavily improved how the tensioner regulates chain tension and dampens harmonics, it is designed to operate optimally up to \u003cstrong\u003e85psi of oil pressure\u003c\/strong\u003e. You \u003cem\u003ecan\u003c\/em\u003e run more oil pressure than that, but doing so will subject you to the same limitations as the factory tensioner: over-tensioning the chain. The more oil pressure you have, the more tension you put on the chain. \u003cstrong\u003eOver-tensioning can cause the timing chain or chain guide to snap due to excessive force\u003c\/strong\u003e. The total load capacity of the timing system is reduced as you introduce more spring pressure, aggressive cam profiles, increase RPM and introduce other shocks like harsh limiters or poor harmonic damping.\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eAt 85psi, we are confident this tensioner will not have the same reliability issues as factory units.\u003c\/span\u003e Our comprehensive testing program included such tests as revving to 6000rpm and hold on a harsh rev limiter instantly from a dead cold start. We've tried. Multiple times. \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 Factory replacement, performance street builds.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOil Pressure Limits:\u003c\/strong\u003e Recommended Max 85psi.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDeck Height Limits:\u003c\/strong\u003e Tolerates +\/- 1mm deck height variations.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cimg class=\"atomic-img\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0587\/5548\/1713\/files\/Atomic_Barra_Street_Tensioner_7-2.jpg?v=1788439490\" alt=\"Atomic Barra Street Chain Tensioner\"\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 Billet steel body, piston, and EN steel ratchet for vastly improved tolerances, finish and strength.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRevised Geometry:\u003c\/strong\u003e Improved kinematics and orientation for lower noise, vibration and harshness.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEnlarged Piston:\u003c\/strong\u003e Increased 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 Integrated 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 Improved air bleeding speeds up damping function, especially critical on cold starts.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMain Spring:\u003c\/strong\u003e Increased stiffness aids cold starts on modified engines.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGuaranteed ICV sealing\u003c\/strong\u003e: Every unit is machine tested before being packaged to guarantee perfect check valve function  \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 Significant improvement to ratchet tooth design using a single, deeper 90° engagement tooth. Not only does this increase the load-handling ability of the tensioner, but we have also slightly increased the tooth spacing\/damping window. This reduces the harshness introduced when the ratchet lock takes the force, allowing hydraulic damping to properly dissipate the energy BEFORE it smashes into the locker.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReduced Tooth Count:\u003c\/strong\u003e Reduces '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 The 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 Added 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\u003ch2\u003eFactory vs. Atomic Tooth Design\u003c\/h2\u003e\n\u003cdiv\u003e\n\u003cimg class=\"atomic-img\" alt=\"Atomic vs Factory Tensioner Tooth Comparison\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0587\/5548\/1713\/files\/Atomic_tensioner_locker_comparison.jpg?v=1789547266\"\u003e\n\u003cdiv class=\"img-caption\"\u003eNotice the updated single tooth design and optimized tooth spacing, which increases the damping window and overall load capacity.\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 class=\"atomic-img\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0587\/5548\/1713\/files\/Atomic_Barra_Street_Tensioner_6-2.jpg?v=1788439490\" alt=\"Tensioner Detail View\"\u003e\n\u003cdiv class=\"img-caption\"\u003eIntegrated Check Valve and Single Tooth 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 Billet EN 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 85psi\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=\"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 all mounting bolts.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrime oil system\u003c\/strong\u003e by 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 The tensioner may make a buzzing noise for several seconds after first start as air bleeds out of the system. This usually only repeats if the engine is not started for extended periods. \u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDO NOT\u003c\/strong\u003e attempt to add more tension to the guide manually\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRotate engine by hand\u003c\/strong\u003e before sealing up. Tensioner may extend one click so please note tensioner movement and resting position. We recommend taking a photo for future reference. This will also help with troubleshooting or warranty claims if difficulties arise. \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 Deck 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 If 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 If 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":"FFP","offers":[{"title":"Default Title","offer_id":49758966317127,"sku":null,"price":299.0,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0585\/8751\/2903\/files\/Atomic_Barra_Street_Tensioner_4-2_600x_6d9c2384-967d-4157-a27d-0dcc6cd6dc6e.webp?v=1791853943","url":"https:\/\/www.ffpgarage.com.au\/products\/atomic-barra-street-chain-tensioner","provider":"FFP","version":"1.0","type":"link"}