Re: [Fot] VACUUM SYSTEM

["Greg Solow" <gregmogdoc@surfnetusa.com>]

I believe that because of this possibility vacuum systems were not legal in 
SCCA sports car racing. This may have changed.

    Our engine in Baby Doll V does not use a vacuum system. We have an oil 
separator on the side of the block that drains back into the crankcase and 
vents to the catch can, and a baffled vent on the upper side of the valve 
cover. Our rear seal is a Chrysler 383 engine lip seal that is a two piece 
seal that rides on the rear of the crank that has been welded and ground 
smooth to the original size, but with no threads. We use permatex high temp 
silicone gasket maker with felt to seal the rear cap. The engine is 
completely dry running at speeds up to 7200 rpm. The catch tank usually has 
nothing or just a 1/2 inch or so of oil in it. A little mist does accumulate 
around the vent on the valve cover.
    The rear seal is something we developed around 1988 and have used 
successfully ever since. Max's Teflon seal looks to be a promising 
alternative if you are not using a "billet" crank that is custom made.
                                                                             
                Greg Solow 
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