[alfa] Re: vapor separator system/increasing hp

[jason paul frautschi <jpfrautschi@xxxxxxxxxxxxx>]

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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