Quote:
Originally Posted by Kodename47
From my understanding is the WRX PCV had a check valve to prevent manifold pressure pressurising the crank case. If your blower connections on are pre-compressor then they will be in vacuum and there is no difference to how it is NA. @ mrg666 runs a centrifugal system where the OEM intake manifold is used so when in boost the PCV hoses are pressurised from the supercharger. I would suggest that the Harrop is like the Sprintex, it'll be obvious as the brake booster line will be connected to the same location. |
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.