{"product_id":"acl-trimetal-reinforced-main-bearings-toyota-lotus-2zz-ge-celica-elise-exige","title":"ACL Race Series main bearings for Toyota and Lotus 2ZZ-GE (Celica, Elise, Exige)","description":"\u003cp\u003eACL Race Series main bearings for Toyota and Lotus 2ZZ-GE (Celica, Elise, Exige), part number 5M1857H. These are the bearings that support the crankshaft in the block, and in a tuned engine, they are responsible for ensuring oil effectively reaches the entire crankshaft.\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 works against the crankshaft.\u003c\/p\u003e\u003cp\u003eThe upper shells have a full 180° oil groove, while the lower shells have a partial groove to ensure oil flow to the connecting rods is not restricted; the end of the groove is tapered to prevent pressure spikes. Race Series bearings have increased crush and a slightly more eccentric shape than standard bearings, both designed to ensure the bearing remains stationary and well-lubricated even when the block and rods deform under load.\u003c\/p\u003e\u003cp\u003eIn standard size, ACL specifies them for a crankshaft journal diameter of 47.988 to 48.000 mm, recommending an oil clearance of approximately 0.051 to 0.061 mm for this diameter. If the crankshaft has been ground, the measurement changes.\u003c\/p\u003e\u003cp\u003eThey do not have the silver-tin finish found on standard bearings, so their dark, brownish-black-bluish color is the factory finish and does not indicate any defect. ACL advises against polishing the bearing surface to adjust clearance; if more is needed, combine them with the HX version, which provides an additional 0.025 mm of clearance.\u003c\/p\u003e\u003cp\u003eIf the crankshaft has been ground or you are unsure of the required size, please contact us with your engine code before ordering.\u003c\/p\u003e","brand":"ACL","offers":[{"title":"Default Title","offer_id":50813124149582,"sku":"ACL-5M1857H\/131","price":173.02,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0816\/7329\/0062\/files\/acl-main-bearings_d9d5e606-a744-446f-99db-3d2945ace878.jpg?v=1735903931","url":"https:\/\/driftandgrip.com\/en\/products\/acl-trimetal-reinforced-main-bearings-toyota-lotus-2zz-ge-celica-elise-exige","provider":"Drift \u0026 Grip","version":"1.0","type":"link"}