Quote:
Originally Posted by pbonsalb
The open vent works, but can transmit smell into the passenger compartment. A vacuum operated system is better because it will pull more air and any pressure in the crankcase costs power. You do see plenty of high power old muscle cars with open vents (breather filters on the valve covers), but the really serious people use belt driven vacuum pumps designed for this purpose. Electric pumps have mixed results -- they typically are not powerful enough.
I am currently running an exhaust scavenge on my turbo E36M3; I have also run an open vent, a breather vent and a catch can. The only one I did not like was the recirculating catch can -- it still pulled oil vapor through into the intake manifold because the suction from the supercharger inlet (before the turbo, I was running a Vortech T Trim) was so strong.
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I agree the recirculating in line catch can still isn't 100% for the cost/hassle. I like the exhaust setup though; running like a Moroso setup? into the downpipe?