BB chevy main bearings ?

[Reed Granrt]

Originally Posted by CFMCNC

Full grooved will deplete the hydrodynamic oil wedge between the shaft and bearing surface.Bill C.

This is a double edge sword. One will help the rods and one will help the mains.
The more groove you put in the main bearing, the more you oil the rod but ALSO the more groove you run, the more hydrodynamic wedge you take from the mains. Contrary to what most people think, the loss of the wedge may not hurt the main bearing but the crankshaft no longer rides in the center of the wedge that you work so hard to develop. Loosing the wedge will cause the crank to move upwards in the bearing and should/could result in more friction in running in the main bearing. The increase in friction should/could cause elevated oil temps. You may never see the elevated temp from such a short run, but needless to say it is there. If you are having no rod bearing issues, then go down on the groove as this will help establish the wedge better. I dont know this to be true but sure sounds good any how. HeHe
reed