gruntguru wrote: ↑
Wed Aug 02, 2017 6:34 am
Oil bath lubrication might further reduce friction.
I am not sure that oil bath would reduce drag. Oil bath was not in use a decade ago from the parts I have seen.
I would say a lubricating mist is best for drag reduction but I do not see how that gets done in a hub.
A grease NLGI Number (relative hardness) has nothing to to with its viscosity number. A thick looking grease can have a very low viscosity at the point where the bearing elements are in contact. I would say using the proper amount of grease (packing?) that the lubrication drag is very similar to a liquid lubricant.
Preparation/setup of wheel bearings is a very precise science. Timken offers a service to NASCAR teams that packs and sets the prelaod of their front hubs. Interesting that it is considered beyond the skill set of the teams.