{"product_id":"acl-6b2484h-rod-bearings-porsche-991-turbo","title":"ACL Porsche 991 3.8L Turbo Connecting Rod Bearing Set","description":"\u003ch4\u003ePrecision Bearings Built for the 991 Turbo's High Boost Loads\u003c\/h4\u003e\n\u003cp\u003eThe Porsche 991 Turbo's MA1.71 flat-six spins hard and loads its rod bearings with serious cylinder pressure from the factory twin-turbo setup. ACL's 6B2484H race series connecting rod bearing set replaces the stock bearings with a trimetal construction engineered to survive higher RPM, added boost, and repeated track sessions without the fade that stock bearings eventually show.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eTrimetal construction (hardened steel back, copper-lead intermediate layer, tin overlay) for superior load capacity over stock bimetal bearings\u003c\/li\u003e\n\u003cli\u003eReduced-friction surface finish that lowers operating temperatures and supports engine longevity under sustained boost\u003c\/li\u003e\n\u003cli\u003eIncreased oil film retention for consistent lubrication during hard acceleration and extended high-RPM pulls\u003c\/li\u003e\n\u003cli\u003eManufactured to tight tolerance bands for consistent, predictable clearances across the full 6B2484H set\u003c\/li\u003e\n\u003cli\u003ePurpose-built application for the 991 3.8L Turbo engine family, not a generic universal-fit bearing\u003c\/li\u003e\n\u003cli\u003eTrusted by engine builders for daily-driven and track-prepped 991 Turbo builds alike\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eFitment Table\u003c\/h4\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eYear Range\u003c\/th\u003e\n\u003cth\u003eMake\u003c\/th\u003e\n\u003cth\u003eModel\u003c\/th\u003e\n\u003cth\u003eTrim\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2013-2016\u003c\/td\u003e\n\u003ctd\u003ePorsche\u003c\/td\u003e\n\u003ctd\u003e911 (991)\u003c\/td\u003e\n\u003ctd\u003eTurbo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2013-2016\u003c\/td\u003e\n\u003ctd\u003ePorsche\u003c\/td\u003e\n\u003ctd\u003e911 (991)\u003c\/td\u003e\n\u003ctd\u003eTurbo S\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2013-2016\u003c\/td\u003e\n\u003ctd\u003ePorsche\u003c\/td\u003e\n\u003ctd\u003e911 (991)\u003c\/td\u003e\n\u003ctd\u003eTurbo Cabriolet\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2013-2016\u003c\/td\u003e\n\u003ctd\u003ePorsche\u003c\/td\u003e\n\u003ctd\u003e911 (991)\u003c\/td\u003e\n\u003ctd\u003eTurbo S Cabriolet\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch4\u003eSpecifications\u003c\/h4\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eDetail\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMPN\u003c\/td\u003e\n\u003ctd\u003e6B2484H-STD\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eACL\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBearing Type\u003c\/td\u003e\n\u003ctd\u003eConnecting Rod Bearing Set\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConstruction\u003c\/td\u003e\n\u003ctd\u003eTrimetal (steel back, copper-lead layer, tin overlay)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eClearance Size\u003c\/td\u003e\n\u003ctd\u003eStandard (STD)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEngine Code\u003c\/td\u003e\n\u003ctd\u003eMA1.71 3.8L Turbo H6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRecommended Use\u003c\/td\u003e\n\u003ctd\u003eStreet and track performance applications\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUPC\u003c\/td\u003e\n\u003ctd\u003eNot published by manufacturer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch4\u003eWhat's Included\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eOne complete set of ACL 6B2484H connecting rod bearing shells sized for all cylinders\u003c\/li\u003e\n\u003cli\u003eManufacturer packaging with bearing size and clearance identification\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eAbout ACL\u003c\/h4\u003e\n\u003cp\u003eACL Bearing Company has manufactured engine bearings in Australia for decades, supplying both OE replacement and race series bearings to builders worldwide. The ACL Race Series line uses trimetal construction specifically to handle the increased loads and temperatures found in forced-induction and high-RPM performance engines, making it a common choice for Porsche, European, and domestic performance rebuilds.\u003c\/p\u003e\n\u003ch4\u003eRelated Parts on Our Site\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/collections\/porsche-parts-accessories\"\u003ePorsche Parts \u0026amp; Accessories\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/collections\/bearings\"\u003eBearings\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/collections\/engine-hardware\"\u003eEngine Hardware\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eFAQ\u003c\/h4\u003e\n\u003cstrong\u003eWhat is the 6B2484H-STD?\u003c\/strong\u003e\u003cp\u003eThe 6B2484H-STD is ACL's Race Series trimetal connecting rod bearing set built specifically for the Porsche 991 3.8L Turbo engine (MA1.71). It replaces the factory rod bearings with a construction designed for higher load and temperature tolerance.\u003c\/p\u003e\n\u003cstrong\u003eWill this bearing set fit a non-turbo 991 Carrera?\u003c\/strong\u003e\u003cp\u003eNo. This bearing set is sized specifically for the MA1.71 3.8L Turbo engine and is not designed for the naturally aspirated 991 Carrera engines, which use different bearing dimensions.\u003c\/p\u003e\n\u003cstrong\u003eWhat does STD clearance mean?\u003c\/strong\u003e\u003cp\u003eSTD indicates standard clearance, precision finished to match OEM crankshaft journal specifications. It is the correct choice for a stock or lightly refreshed crankshaft that has not been machined undersize.\u003c\/p\u003e\n\u003cstrong\u003eDo I need to replace main bearings at the same time?\u003c\/strong\u003e\u003cp\u003eIt is not required, but many engine builders replace main and rod bearings together during a rebuild to ensure consistent wear characteristics and avoid a second teardown later.\u003c\/p\u003e\n\u003cstrong\u003eIs this bearing set suitable for track use?\u003c\/strong\u003e\u003cp\u003eYes. The trimetal construction is specifically engineered for the higher loads and sustained temperatures seen in track driving and forced-induction applications, making it a common upgrade for track-prepped 991 Turbo builds.\u003c\/p\u003e\n\u003cstrong\u003eWhat is trimetal bearing construction?\u003c\/strong\u003e\u003cp\u003eTrimetal bearings use three layers, a hardened steel back for strength, a copper-lead intermediate layer for load capacity, and a thin tin overlay for break-in protection and corrosion resistance, offering more durability than a standard two-layer bimetal bearing.\u003c\/p\u003e\n\u003cstrong\u003eCan I reuse my old bearings after inspection?\u003c\/strong\u003e\u003cp\u003eRod bearings are a wear item and should be replaced as a full set any time the rod caps are removed, since partial reuse can create uneven clearances and premature failure.\u003c\/p\u003e\n\u003cstrong\u003eDoes this bearing set come with installation instructions?\u003c\/strong\u003e\u003cp\u003eDetailed clearance-checking and installation procedures are not included in the box and should follow a qualified engine builder's process, including plastigauge or micrometer clearance verification before final torque.\u003c\/p\u003e\n\u003ch4\u003eInstall Instructions\u003c\/h4\u003e\n\u003col\u003e\n\u003cli\u003eRemove the engine and disassemble to access the connecting rods and crankshaft per the factory service procedure.\u003c\/li\u003e\n\u003cli\u003eInspect the crankshaft rod journals for wear, scoring, or out-of-round condition and machine if necessary before bearing installation.\u003c\/li\u003e\n\u003cli\u003eClean all oil galleries and mating surfaces thoroughly before installing new bearing shells.\u003c\/li\u003e\n\u003cli\u003eInstall the ACL 6B2484H-STD bearing shells into the rod and cap, ensuring correct orientation and full seating in the bearing bore.\u003c\/li\u003e\n\u003cli\u003eVerify oil clearance using plastigauge or a micrometer and bore gauge before final assembly.\u003c\/li\u003e\n\u003cli\u003eTorque connecting rod bolts to the manufacturer's specified value using the correct sequence and a calibrated torque wrench.\u003c\/li\u003e\n\u003cli\u003ePrime the oiling system before first startup to ensure immediate lubrication to the new bearings.\u003c\/li\u003e\n\u003cli\u003eFollow a proper break-in procedure and recheck for leaks or unusual noise after the first heat cycle.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003ch4\u003eProp 65 Warning\u003c\/h4\u003e\n\u003cp\u003eWARNING: This product can expose you to chemicals including lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information, visit www.P65Warnings.ca.gov.\u003c\/p\u003e\n","brand":"ACL","offers":[{"title":"Default Title","offer_id":46320993960015,"sku":"ACL6B2484H-STD","price":172.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1062\/7920\/files\/acl-6b2484h-porsche-991-turbo-rod-bearing-set-1.png?v=1785502969","url":"https:\/\/www.blackopsautoworks.com\/products\/acl-6b2484h-rod-bearings-porsche-991-turbo","provider":"Black Ops Auto Works","version":"1.0","type":"link"}