Originally Posted by Kestas
I never heard of a surface being too highly polished for hydrodynamic lubrication. I believe it can be a factor in low-speed applications, where you sometimes want to create mini reservoirs for oil lubrication. But not for hydrodynamic lubrication.
My thoughts as well, since in fully hydrodynamic lubrication there is total separation of the journal and the bearing due to the oil wedge, which is caused by the relative motion of the journal wrt bearing.
In the cylinder bore you want cross-hatching or laser dot depressions for mini oil reservoirs.
I would think there is point of diminishing returns in terms of journal finish verses oil entrainement.