The Cosworth Vega had a check valve on each exhausr manifold runner with a
line to the valve cover or air cleaner(I forget which) rather than an air pump.
kw
In a message dated 11/24/2004 2:41:46 PM Pacific Standard Time,
andycost@earthlink.net writes:
> I've always wanted to do the negative crankcase pressure trick ala NASCAR.
> They sell a kit at www.summitracing.com
> It has a tube with a valve at either end. One end welds onto the exhaust
> manifold and the other onto the valve cover. Drawing a vacuum on the
>crankcase
> increases piston ring seal and raises the compression in the combustion
> chamber. It also reduces oil foaming in the sump which decreases windage
> associated drag.
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