ACL Race Series connecting rod bearings for Ford BD Cosworth
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- Collection at our shopCartagena, Spain
ACL Race Series connecting rod bearing set for Ford BD Cosworth, part number 4B1060H. This is ACL’s competition range, the same used in drift, circuit, and drag racing engines.
They feature three layers over a high-strength steel backing: a copper-lead-tin lining, a thin nickel barrier, and a lead-tin-copper sliding layer that works against the crankshaft. On connecting rod bearings, the surface layer is thinner to better withstand fatigue.
Race Series bearings feature higher crush and a slightly more eccentric shape than standard bearings—two details designed to keep the bearing from moving and ensure proper lubrication when the block and connecting rod deform under load.
In standard size, ACL specifies them for a crankpin diameter of 49.200 to 49.213 mm, with a bearing width of 19.17 mm. For this diameter, an oil clearance of approximately 0.052 to 0.062 mm is recommended, measured with a micrometer and bore gauge. If the crankshaft is reground, the measurements will change.
They do not have the silver-tin final plating of standard bearings, so their dark color—ranging between brown, black, and bluish—is the factory finish 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 0.025 mm of additional clearance.
If the crankshaft is reground or if you are unsure of the required size, please contact us with the engine code before placing your order.