On Monday 10 April 2006 07:52, N197TR4@cs.com wrote:
> Sure, pulling negative pressure in the crankcase will help the oil stay
> inside
> ... that's no proof the seal is good or bad.
>
> Pry tell, how do you pull a vacuum on the crankcase with no manifold vacuum
> ? Or do you race with the throttles closed ?
> <G>
>
> Randall
Negative crankcase pressure is used in high horsepower engines to help, I
believe, reduce windage HP losses. A separate vacuum pump is used.
At 500+ HP, I suspect that the energy used to drive the pump is negligible
versus the benefit it provides, but at our 100 HP level, it would be just for
show.
--
Hoyt
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