PCV Check valve pressures
 

I’ve read a lot about the stock style PCV valves leaking under boost, and that even the upgraded all metal ones aren’t that reliable.

This seems to be the most common universal check valve, that I can find.
I found a couple of universal 10mm check valves that list an Opening pressure of .2 bar (20kpa, ~3 psi), and a operating pressure of .2 bar to 6 bar.


I know it depends on the situation, but is 3 psi within the crankcase reasonable? Is .2 bar too high of a pressure under acceleration and boost? At idle, even if the crankcase is at atmospheric, the vacuum alone would pull 70 kpa across the check valve.

Should I look for a graph of opening % vs pressure?

Warning. Overthinking Overthinking Warning.

I could not follow your link. Just Use This between stock PCV and IM.

Thanks, I just ordered 4 of them, they were only $5.96.
taxes and shipping were only another $14.00. Jesus