ACL Race Series connecting rod bearings for Nissan VQ20, VQ25, VQ30
Fits
Nissan
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- Collection at our shopCartagena, Spain
ACL Race Series connecting rod bearing set for Nissan VQ20, VQ25, VQ30, part number 6B2630H. This is ACL's competition line, the same used in drift, circuit, and drag racing engines.
They are tri-metal bearings: a SAE 1010 steel backing, a copper-lead-tin layer approximately 0.3 mm thick, a nickel barrier, and a lead-tin-copper surface layer that conforms to the crankshaft surface and resists seizing. In the rod bearings, the surface layer is thinner to better withstand fatigue.
Compared to a standard bearing, the Race series has more housing crush, which improves retention and heat transfer, and greater eccentricity to promote an oil film when the engine is revving high.
In standard size, ACL specifies them for a rod journal of 44.956 to 44.974 mm, with a bearing width of 17.0 mm. For that diameter, they recommend an oil clearance of about 0.049 to 0.058 mm, measured with a micrometer and bore gauge. If the crankshaft has been ground, the measurement changes.
They do not have the silver-tin final coating of normal bearings, so their dark color, ranging from brown and black to 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 are combined with the HX version, which provides 0.025 mm more clearance.
If the crankshaft has been ground or you do not know which size you need, write to us with your engine code before ordering.