{"product_id":"acl-trimetal-reinforced-rod-bearings-toyota-1fz-fe","title":"ACL Race Series connecting rod bearings for Toyota 1FZ-FE","description":"\u003cp\u003eACL Race Series connecting rod bearing set for Toyota 1FZ-FE, part number 6B7990H. This is ACL's competition range, the same used in drift, circuit, and drag racing engines.\u003c\/p\u003e\u003cp\u003eThese are tri-metal bearings: SAE 1010 steel backing, a 0.3 mm copper-lead-tin intermediate layer, a nickel barrier, and a lead-tin-copper overlay that conforms to the crankshaft surface and resists seizure. In the connecting rod bearings, the overlay is thinner to better withstand fatigue.\u003c\/p\u003e\u003cp\u003eCompared to standard bearings, the Race range has more crush for better seating and heat transfer, and increased eccentricity to promote an oil film at high engine speeds.\u003c\/p\u003e\u003cp\u003eIn the standard size, ACL specifies them for a connecting rod journal of 56.980 to 57.000 mm, with a bearing width of 21.4 mm. For this diameter, they recommend an oil clearance of about 0.059 to 0.070 mm, measured with a micrometer and bore gauge. If the crankshaft has been ground, the measurement changes.\u003c\/p\u003e\u003cp\u003eThey do not have the final silver tin plating 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, confirm the measurement of your crankshaft (standard or ground); if you have any questions, write to us with your engine code.\u003c\/p\u003e","brand":"ACL","offers":[{"title":"Default Title","offer_id":50813129785678,"sku":"ACL-6B7990H\/143","price":118.68,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0816\/7329\/0062\/files\/acl-rod-bearings_822ad8b3-f46e-4bf1-964d-ef0d72028790.jpg?v=1735903964","url":"https:\/\/driftandgrip.com\/en\/products\/acl-trimetal-reinforced-rod-bearings-toyota-1fz-fe","provider":"Drift \u0026 Grip","version":"1.0","type":"link"}