ACL Race Series main bearings for Renault Sport F4R R3
Fits
Renault
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- Collection at our shopCartagena, Spain
ACL Race Series main bearing set for Renault Sport F4R R3, part number 5M7819H. These support the crankshaft in the block and, in a tuned engine, are responsible for ensuring that oil reaches the entire crankshaft correctly.
Internally, 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 what works against the crankshaft.
The upper bearings have a full 180° oil groove, while the lower bearings have a partial groove to avoid interrupting oil flow to the connecting rods, and the end of the groove is tapered to prevent pressure spikes. The Race Series bearings have increased crush and a slightly more eccentric shape than standard bearings—two details designed to keep the bearing from moving and properly lubricated when the block and connecting rod deform under load.
They do not have the final silver tin plating found on standard bearings, so their dark color (a mix of brown, black, and bluish) is as intended 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.
If the crankshaft has been reground or you are unsure of the required size, please message us with your engine code before ordering.