Quote:
Originally Posted by neukin
So when a piston goes up your negative pressure would be bad so whats the gain?
Also like i said the whole reason for it is to keep hot and oiled air out of the intake system since it can create detonation. (oil in ic and oil on your MAF isnt good either)
The oil that shoots out of the valve cover from excessive pressure (kicked up from cams and such) is caught by the can and the filter is large thus letting any positive air move through the filter. Id use another vac source like i said in the last post. The only reason the factory setup goes into the intake is for emissions and its legal.
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I don't want to go to far off topic here... there's no advantage to having a pressurized motor, forcing the piston upwards certainly isn't worth the other problems its going to cause nor does it make sense from an engineering standpoint.
You want vacuum, not just a pressure vent, look at stock setups from any car - PCV valve to the IM, usually a vent to the intake. Why would they design it there if it was pointless? Might as well just seal everything shut. Whoever designed the SR put in the factory air/water separator above the exh. mani stock..
You also realize that almost every vacuum source (minus exhaust flow) is going back into the motor anyways.
The idea of the evac system is to remove pressure, search it, google it, whatever... every car comes with one, some ls1's have a seperate vaccuum pump designated for it. Oil shooting from a VC is usually a sign of more serious issues than standard crankcase pressure.
I started a thread a while back and here's some more info
http://www.honda-tech.com/showthread.php?t=1199935