[no subject]

["Jim Steck" <4sfed@xxxxxxxxx>]

You live a very sheltered life  ;-)  This is a very common drag-racer / hot
rod trick.  A kit for a dual exhaust V-8 is available from Jeg's for $31.99,
part no.  720-6002.

Regards,
Jim Steck

> ---------------------------snip ----------------------------
> Andy Menapace writes (snipped):

> "... I think it would be easy to convert the system to a filter on the cam
> cover and oil return line to the dipstick. ... Does this type of
modification
> add horse
> power? "

> to follow up my own post...

> Vizard describes a two-stage crankcase pressure reduction system in the
book
> "Tuning BL's A-Series Engine", with the benefits claimed to be reduced
work
> for the oil rings, so much so that the rings can be somewhat detensioned
and
> still be effective, reduced oil dilution in the intake charge, leading to
less
> octane loss from dilution, and reduced windage losses in the engine from
> pumping air around the crankcase. the first stage is venting to the intake
> manifold, which at idle is under vacuum and will draw pressure from the
> crankcase. the second stage involves running a vent pipe into the stream
of
> exhaust, in line with the flow direction, which draws pressure as exhaust
gas
> speeds increase in non-idle conditions. an anti-reversion valve is
required
> for the second stage to avoid blowing up the crankcase in the event of a
> backfire. for effectiveness, says Vizard, the engine should be air tight,
> which he defines as able to hold 15-20" H20 vacuum, meaning that the
dipstick
> and distributor holes would need to be addressed. also required is a good
> oil-vapor separator.

> it sounds like an interesting idea to me. i've never seen it on any car.
> anyone ever try something like this? maybe Andy will volunteer his car as
a
> guinea pig...

> - -jason frautschi
> annapolis, md
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