{"product_id":"acl-trimetal-reinforced-main-bearings-mitsubishi-4g61-4g62","title":"ACL Race Series main bearings for Mitsubishi 4G61, 4G62","description":"\u003cp\u003eACL Race Series main bearings for Mitsubishi 4G61, 4G62, part number 5M1144H. These 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\u003eThe structure is trimetal, consisting of a steel back, a copper, lead, and tin lining, a nickel barrier, and a soft surface layer that adapts and prevents seizing even under very high loads.\u003c\/p\u003e\u003cp\u003eThe upper bearings feature a full 180° oil groove, while the lower bearings have a partial groove to ensure oil flow to the connecting rods is not interrupted, with a tapered groove end to prevent pressure spikes. Race Series bearings have increased crush and a slightly more eccentric shape than standard bearings—two details designed to ensure the bearing remains stationary and well-lubricated as the block and rod deform under load.\u003c\/p\u003e\u003cp\u003eIn standard size, ACL specifies them for a crankshaft journal diameter of 56.980 to 57.000 mm, recommending an oil clearance of approximately 0.059 to 0.070 mm for this diameter. If the crankshaft has been reground, the measurement changes.\u003c\/p\u003e\u003cp\u003eThey do not have the silver-tin flash plating of standard bearings, so their dark, brownish-black-bluish color is as they come from the factory 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\u003eBefore ordering, 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":50813086204238,"sku":"ACL-5M1144H\/64","price":151.95,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0816\/7329\/0062\/files\/acl-main-bearings_52b829dd-c050-4289-acb9-a45c085f1ab8.jpg?v=1735903756","url":"https:\/\/driftandgrip.com\/en\/products\/acl-trimetal-reinforced-main-bearings-mitsubishi-4g61-4g62","provider":"Drift \u0026 Grip","version":"1.0","type":"link"}