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

[Bernd Felsche]

On Fri, Dec 06, 2002 at 09:16:09AM -0600, Greg Hermann wrote:
> At 11:59 PM 12/6/02, Mike wrote:

> >next thing to check is the issue of light greased vs sealed oil bearings
> >for the wheels <sigh>

> >*grin*

> >Thanks for going to the trouble to describe this :)

> For reduced wheel bearing drag in an economy run, one might try
> what the Nascar boys do for qualifying--10 wt or light synthetic
> oil in the wheel bearings, no grease.

Dry, with no seals is even lower friction as there's no viscous drag
on the rolling. I don't think that the normal wheel bearing will do
3000km though... not the way bearings are loaded and sized for road
cars. Heavier grease lube acts more like a gear-oil by helping to
distribute contact pressure resulting in longer life.

If you want to try it out, strip down the bearing an wipe it "dry"
before re-assembly. There are some lubricants that can be used for
dry-lube such as spray-on PTFE or silicone; or even gun-oil such as
Ballistol. All of these tend to leave a stick-free surface.

Coincidentally, I'm working on the design of wheel hubs for a solar
race car.

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.

Then there's also the matter of lubricating the cage...

-- 
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