> > Thanks, Paul.

The reason I asked is that is what I did on my engine. I used a #47

drill to

make the jets.
My oil pressure is now lower than without the mod, about 45PSI at any

RPM

above 2000, while before the mod it ran closer to 60PSI. At idle, when

the

oil is hot, it runs much lower, about 15 PSI. I was wondering if that is
normal for this mod. I did check the oil pump and first pressure

regulator

by blocking off the oil inlet to the rear housing and while cranking got
~90PSI, which is normal. Maybe the second regulator is bypassing too

much,

but I suspect that the jet mod lowered my oil pressure. Has anyone else
tried this mod with different results?

Chuck Dunlap

Interesting. It should only affect it at low RPM. At high RPM centrifugal
load on the spring loaded ball valve in the e-shaft rotor cooling squirter
causes it to open. It looks like, from the curves in the book, the
ball valve is fully open at 3000 RPM.

What is the diameter of a #47 drill Chuck?
2 mm is .0787 inch. Perhaps a #47 is too large.

Paul Lamar

Ed Anderson wrote:

Hi Paul, Chuck

    I have had the eccentric oil  jets installed in my engines (both the 86
and now the 91) and can say you should not see that kind of oil pressure.
My oil pressure does not drop below 30 psi at idle and is 75 psi above 4000
rpm. This is with the used oil pump I installed at Tracy Crooks.  With my
original oil pump low was 50 psi at idle and 85 psi at 4000 and above.  I
agree with Paul, I think your jets may be too large.  I am not certain the
exact size I have as I got the jets from Bruce Turrentine, but assume they
are 2mm.

Ed Anderson

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