Subject: Re: 30 dollar 12HP+ air foil? by CentralCoaster on 2009/12/17 5:33:49
Quote:
anesthes wrote:
Thats horsecrap. The PVC is fed from the left side of the manifold, and the fresh air comes from the throttle body (on some years). The fresh air circuit is cast into the bac side of the throttle body, the airfoil has nothing to do with that.
No, the PCV fresh air is in front of the throttle blades. Right between the throttle bores up top where the airfoil bolts in. (If it fed from the vacuum side, and the pcv enters the vacuum side, there'd be not much of a pressure difference, and no flow.) At wot, there isn't much manifold vacuum, so the PCV system doesn't flow much. All it's really doing then is allowing blowby to escape through the fresh air connection and through the pcv. If you block the fresh air vent, you will increase crankcase pressure slightly at WOT.
