Paul Having grief trying to locate the bearing that Tracy uses in
the Reduction box.  It is 80mm OD,  60mm ID and 4mm thick. Both sides
and needles are made into the one unit.  Is there a bearing number or
where can I get these??

Neil Ungar


I can't find that exact size either. Look at these two. Tracy1.jpg
and Tracy.jpg Both are RPM limited to 3600 RPM. Not good.

No need for an exact replacement. A stack of at least three needle
bearings will work well. Each bearing will rotate at 1/3 shaft
speed.


Perhaps you are talking about a Ford C6 part inside the planet
carrier? Sounds like it as 80 mm is over 3 inches in diameter. Too
big for the helical gear thrust bearing. In that case the RPM is much
lower. Slauson would have it.


Randy Kempf is taking over the gear box building effort and can ship
over seas. I am going to focus on the ignition systems. Randy Kempf
<naa73x@gmail.com Paul Lamar


Paul   Are you relying upon the oil viscosity to divide the speed
between the 3 thrust elements? Regards Bill McDonald

It will work dry or wet with oil I suspect. As you go down through
the stack. For every action there is an equal and opposite reaction

We know for a fact it works as some people have hundreds of hours on
them. .

Paul Lamar


The system of adding 2 or more axial rolling element bearings to
reduce
the speed of each works as friction increases with speed.

EG. having 6000 rpm and two bearings, each will turn near 3000 rpm. It
cannot happen that one runs 5000 rpm and tho other only 1000 rpm as the
difference in friction does not allow this. (Only if one seizes then the
other one will run full speed, and likely will then not last too long.)

Rolf Pfeiffer


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