{"product_id":"acl-race-rod-bearing-set-bmw-m3-e46-s54b32","title":"ACL Race Series connecting rod bearings for BMW M3 E46 S54B32","description":"\u003cp\u003eACL Race Series connecting rod bearings for BMW M3 E46 S54B32 (part number 6B1569H), designed for engines that will operate under much higher loads and higher RPMs than stock.\u003c\/p\u003e\u003cp\u003eThese are tri-metal bearings: SAE 1010 steel backing, a copper-lead-tin layer approximately 0.3 mm thick, a nickel barrier, and a lead-tin-copper overlay that conforms to the crankshaft surface and resists seizure. In connecting rod bearings, the overlay is thinner to better withstand fatigue.\u003c\/p\u003e\u003cp\u003eRace Series bearings feature increased crush and a slightly more eccentric shape than standard bearings—two details designed to ensure the bearing remains secure and properly lubricated as the block and rod deform under load.\u003c\/p\u003e\u003cp\u003eIn standard size, ACL specifies them for a crankpin diameter of 48.975 to 48.991 mm, with a bearing width of 16.0 mm. For this diameter, they recommend an oil clearance of approximately 0.052 to 0.062 mm, measured with a micrometer and bore gauge. If the crankshaft has been reground, the dimensions will change.\u003c\/p\u003e\u003cp\u003eThey do not feature the final silver-tin plating of standard bearings, so their dark, brownish-black and bluish color is factory standard and does not indicate a defect. ACL advises against polishing the bearing surface to adjust clearance; if more clearance is needed, they should be combined with the HX version, which provides an additional 0.025 mm of clearance.\u003c\/p\u003e\u003cp\u003eBefore ordering, please confirm the dimensions of your crankshaft (standard or reground); if you have any questions, write to us with your engine code.\u003c\/p\u003e","brand":"ACL","offers":[{"title":"Default Title","offer_id":50813076603214,"sku":"ACL-6B1569H-STD","price":185.23,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0816\/7329\/0062\/files\/acl-m3-e46.jpg?v=1735903587","url":"https:\/\/driftandgrip.com\/en\/products\/acl-race-rod-bearing-set-bmw-m3-e46-s54b32","provider":"Drift \u0026 Grip","version":"1.0","type":"link"}