U-Groove - Greater load surface

  • Better load distribution across the bearing surface
  • A more stable hydrodynamic lubrication regime
  • Greater bearing durability at high RPM’s

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.

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 90⁰ oil groove shape. U-Groove™ increases bearing load capacity by expanding the surface area, while keeping oil flow capacity intact.

U-Groove™ Technical Paper

Modified Design of Oil Groove for High Performance Bearings