[Diy_efi] (off topic) Disk pad wear reduction ...

[Shannen Durphey]

Bernd Felsche wrote:
> The reason for running some lubrication is because the diameter of
> the inner race is different to that of the outer race so the rolling
> element has to slip against one or both surfaces. It follows that
> the closer the circumferences of the races, the lower the amount of
> slip - been thinking about this sort of thing a lot over the past
> couple of weeks.

At one time the ads for GM wheel bearings read "Nothing rolls like a ball."
This was around the same time that barrel ground roller bearings could be
found in larger vehicles.  Both designs were supposed to offer less
resistance, and both cost more to produce.

I do know that the older cars (1950's) with drum brakes and ball type wheel
bearings seem to have less drag, as watched with the vehicle on the hoist
and the wheels in the air.  I also know that US manufacturers switched back
to ball bearings in most vehicles during the '80s, about the same time they
introduced the lockup torque converter and reduced drag disc brake systems.

Shannen

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