mike h wrote:

Other than 'belling' the mouth of the oil pickup, and machining the oil
passage boss to the front cover for a bigger Oring, what sort of oil

mods

have folks done? I'm at about that stage in my rebuild.

Mike Harrington

You got me there Mike.

In almost four years of this newsletter people have had little or no
trouble with the oil system itself other than cooling. Some have mentioned
the "windowed main" or rotor bearing inserts.

I am using 3rd gen main bearings, which have a deeper oil groove and small
windows around the periphery.

Did you disable
the oil thermostat in the nose of the e-shaft?

Yes - I got a pellet from Bruce T. But I would have found one somewhere.

Also some have enlarged the oil jets in the e-shaft that supply
cooling oil to the rotors. There is a plus and minus to this idea.
Larger jets could mean lower oil pressure to the bearings.
I would suspect it would be a good idea in conjunction
with a larger capacity oil pump.

With a 1990 turbo core motor, I have IIRC the largest volume oil pump
available. The 3rd gen was the same size. I will be using the pressed-in
jets in the Eshaft.

I've seen several racing motors with these mods and they had normal oil
pressures (well, given the 80PSI regulator) even when cold.

Have you put in teflon encap silicone oil O-rings in the rotor
oil scraper rings?

I decided not too - I wasn't burning much oil from the rings at 160K miles,
and the orings in the oil control rings looked fine when I removed them. I
just got stock replacements.

I will also be using the external oil reservoir for the OMP, as soon as the
gentleman making them makes the one I need. (I'm on a list :)

Mike Harrington

OMP = oil metering pump.

Our man Richard Sohn must be doing a land office business with these things.
Good for him.

Paul Lamar
 
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