Quote:
Originally Posted by mrg666
WRX PCV valve and our stock PCV valve have the same functionality and fit. The difference should be the higher pressure that WRX PCV valve can hold up. This is my understanding.
I don't know about the Harrop system. But one thing is obvious (at least to me) that the compressor (centrifugal or screw) is pressurizing the intake manifold. The crankcase should not be connected to the intake manifold without a check valve. And if there is a catch can, the check valve should be on the hose connecting the catch can to intake manifold.
If Harrop has a built-in check valve on the port connecting to crankcase, if this is what you mean, that I can understand. In that case, I agree, no additional check valve or WRX PCV valve replacement needed.
|
What he was getting at is the Harrop connects to the stock PCV on the vacuum side of the supercharger (throttle body most likely), so there is no difference from stock and you don't need a check valve.