{"product_id":"acl-trimetal-reinforced-main-bearings-nissan-350z-280-300-bhp-vq35de","title":"ACL Race Series main bearings for Nissan 350Z - 280 and 300 bhp (VQ35DE)","description":"\u003cp\u003eACL Race Series main bearing set for Nissan 350Z - 280 and 300 bhp (VQ35DE), part number 4M2633H. These support the crankshaft in the block, and in a tuned engine, the proper delivery of oil to the entire crankshaft depends on them.\u003c\/p\u003e\u003cp\u003eThese are tri-metal bearings: an SAE 1010 steel backing, a copper-lead-tin layer approximately 0.3 mm thick, a nickel barrier, and a surface layer of lead, tin, and copper that conforms to the crankshaft surface and resists seizing.\u003c\/p\u003e\u003cp\u003eThe upper bearings feature a full, 180° oil groove, while the lower ones have a partial groove to ensure oil flow to the connecting rods is not interrupted, with a tapered groove end to prevent pressure spikes. ACL manufactures them with more \"crush\" (housing interference) than standard bearings to ensure a secure fit and better heat dissipation, as well as greater eccentricity, which helps maintain the oil film when the housing deforms at high RPMs.\u003c\/p\u003e\u003cp\u003eIn the standard size, ACL specifies this for a crankshaft journal of 59.951 to 59.975 mm and recommends an oil clearance of approximately 0.061 to 0.073 mm for that diameter. If the crankshaft has been reground, the measurement changes.\u003c\/p\u003e\u003cp\u003eThey do not have the silver tin finish of standard bearings, so their dark, brownish-black and bluish color is factory-standard and does not indicate any defect. ACL advises against polishing the bearing surface to adjust clearance; if more 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 measurement 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":50813095444814,"sku":"ACL-4M2633H\/89","price":84.29,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0816\/7329\/0062\/files\/acl-main-bearings_29473e31-e503-41e4-b244-1939e97a7538.jpg?v=1735903817","url":"https:\/\/driftandgrip.com\/en\/products\/acl-trimetal-reinforced-main-bearings-nissan-350z-280-300-bhp-vq35de","provider":"Drift \u0026 Grip","version":"1.0","type":"link"}