King Race Bearings U-Groove - Engine Builder Magazine
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King Race Bearings U-Groove

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In racing main bearings, the groove’s shape and size perform a vital role. The groove should be wide enough to allow sufficient oil flow, but narrow enough to maximize the working surface.

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In today’s race engines, contrary to popular belief, there is significant load on the upper main bearing shells. The extra load is a product of the inertia forces generated by high RPM. The extra force demands higher load capacity.

In response, King Racing’s TechLab developed U-Groove – a unique 90-degree oil groove shape. U-Groove increases bearing load capacity by expanding the surface area, while keeping oil flow capacity intact.

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