{"product_id":"acl-trimetal-reinforced-rod-bearings-opel-family-ii","title":"ACL Race Series connecting rod bearings for Opel Family II","description":"\u003cp\u003eThese ACL Race Series connecting rod bearings, part number 4B2322H, are for the Opel Family II engine. They are the standard choice when opening an engine for performance upgrades.\u003c\/p\u003e\u003cp\u003eInternally, they feature three layers on a high-strength steel backing: a copper-lead-tin lining, a thin nickel barrier, and a lead-tin-copper sliding layer, which is the surface that interfaces with the crankshaft. In the connecting rod bearings, this top layer is thinner to better withstand fatigue.\u003c\/p\u003e\u003cp\u003eCompared to standard bearings, the Race series has increased crush in the housing, which improves retention and heat transfer, as well as greater eccentricity to support the oil film when the engine is revving high.\u003c\/p\u003e\u003cp\u003eIn standard size, ACL specifies them for a crankpin diameter of 48.971 to 48.987 mm, with a bearing width of 19.3 mm. For this diameter, they recommend an oil clearance of approximately 0.052 to 0.062 mm, measured using a micrometer and bore gauge. If the crankshaft has been reground, the measurements will change.\u003c\/p\u003e\u003cp\u003eThey do not have the silver tin finish of standard bearings, so their dark color—ranging from brown and black to bluish—is normal from the factory and does not indicate any defect. ACL advises against polishing the bearing surface to adjust clearance; if more is needed, they can be combined with the HX version, which provides an additional 0.025 mm of clearance.\u003c\/p\u003e\u003cp\u003eIf the crankshaft has been reground or you are unsure about the required size, please contact us with your engine code before ordering.\u003c\/p\u003e","brand":"ACL","offers":[{"title":"Default Title","offer_id":50813099245902,"sku":"ACL-4B2322H\/94","price":66.54,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0816\/7329\/0062\/files\/acl-rod-bearings_7b50568a-8d74-4a05-aeda-9b2f6a701b7b.jpg?v=1735903829","url":"https:\/\/driftandgrip.com\/en\/products\/acl-trimetal-reinforced-rod-bearings-opel-family-ii","provider":"Drift \u0026 Grip","version":"1.0","type":"link"}