Paul
     > Have you any suggestions for a rotary PCV system using
     > a turbo? Have not seen it covered in my yr of
     > following your posts. And is there a better term to
     > replace "crankcase" in this acronym?
     > regards, Robert

     To my knowledge nobody has dealt with that. Blow by does not seem to
be a large
     if any  problem in AC use. Not like there is windage on the
crankshaft.

If I recall correctly, Tracy Crook said something about some oil blowing
out of his engine at around 7,000 RPM, and that he was working on
correcting it. It seems that he was having the problem
since he started using the 2.85/1 redrive. If he is having a problem, it
would be good to know how to alleviate it.

Brian Trubee

Bruce Turrentine cut away part of the breather system on the RX8 engine
Tracy
is using. Here is an illustration of what was cut away.

Paul Lamar

Archie wrote:

Not sure if this is applicable to the rotary, but all our piston racing
engines
incorporate both mechanical and exhaust augmented vacuum devices.
We want negative pressure in the "crank case", to eliminate blowby and
improve ring sealing. We do, in fact, install the main crank seals backward
due to the amount of vacuum. If a mechanical vacuum pump is not used,
a 5 or 6 section scavenge pump is used. My aircraft, a Sidewinder,
uses one of those ahem! "L" brand aircraft engine, and when I got tired of
belly cleaning, decided to use race car type exhaust augmentation.
Now, anything that enters the exhaust, is "cooked", plus I have a slight
vacuum in the crankcase at operating rpm.
Sorry about the long wind, a habit from teaching I guess.
Archie

 
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