ACL Race Series connecting rod bearings for Renault 5 Turbo and GT Turbo
Fits
Renault
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- Collection at our shopCartagena, Spain
ACL Race Series connecting rod bearings for Renault 5 Turbo and GT Turbo (part number 4B7906H), designed for engines that will operate under much higher loads and at higher RPMs than stock.
These are tri-metal bearings: an SAE 1010 steel base, a copper-lead-tin layer approximately 0.3 mm thick, a nickel barrier, and a surface overlay of lead, tin, and copper that conforms to the crankshaft surface and resists seizing. In connecting rod bearings, the overlay is thinner to better withstand fatigue.
ACL manufactures them with more "crush" (housing interference) than standard bearings to ensure they remain securely seated and dissipate heat better, as well as with more eccentricity, which helps maintain the oil film when the housing deforms at high RPMs.
In standard size, ACL specifies them for a connecting rod journal of 43.965 to 43.980 mm, with a bearing width of 17.75 mm. For this diameter, they recommend an oil clearance of approximately 0.048 to 0.057 mm, measured with a micrometer and bore gauge. If the crankshaft has been reground, the measurement changes.
They 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 clearance is needed, they should be paired with the HX version, which provides an additional 0.025 mm of clearance.
Before ordering, confirm your crankshaft measurement (standard or reground); if you have any questions, email us with your engine code.