Deleting the Crankcase vent?

BillyBoy

I know I’m reviving a decade old thread, so no one may even have this info anymore. Can I check Spohn, if I run vents on the rear ports (that usually connect to the intake tubes), and leave the front PCV hoses (with the check valves, that connect to the front of the manifold) connected like OEM, will that work fine?

I’m seeing so much conflicting info on the PCV and CCV system for these motors, hard to make heads or tails of it.

projectpanda

Yes, running rear ports vented to atmosphere with front PCV valve is fine. The rears allow venting when the PCV valve closes.

I speak from experience, if you block the rears with the PCV valves up front, you will create a too much vacuum that it will pull oil up enough to cause the low oil light to come on.

ideally, if you want to keep the PCV valve, utilize a closed system with the rears plumbed to the intakes to assist in bring fresh air or help suck the vented pressure when the PCV valve closes.

otherwise, vent everything to atmosphere, front and rear.

I am speaking with regards to a NA setup.

I know for the SR20 engines, its seen to be most benefited to run it how Phunk mentioned so it seems it applies to boosted VQ also.

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RHM 75mm TB & ported up/low mani., 3" intakes, Z1 Headers, Motordyne ART pipes, Henko Autolab 3" y pipe & exhaust, Tein MonoSport, SPL F/R arms, endlinks, and tie rods , Eibach sways, Z1 rotors F/R, diff bush., subframe collar, FDF diff brace