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IMO to do it right, you need a three port can. Most catch can systems are designed for NA (intake is always under vacuum unless WOT).
1)Center port is for crankcase port (dirty gases).
2)NA port with one way check valve when engine not in boost (NA - vacuum in intake)
3)Boost port with one way check valve when engine in boost (Boost - positive pressure in intake)
If your can is large enough you can add a port. The issue with most cans is that their inside volume is too small to work effectively.
IMO to do it right, you need a three port can. Most catch can systems are designed for NA (intake is always under vacuum unless WOT).
1)Center port is for crankcase port (dirty gases).
2)NA port with one way check valve when engine not in boost (NA - vacuum in intake)
3)Boost port with one way check valve when engine in boost (Boost - positive pressure in intake)
If your can is large enough you can add a port. The issue with most cans is that their inside volume is too small to work effectively.
Sent you a PM.
I have a similar setup except, like many others I am using a two port.
One line from the Turbo inlet that works as a vent under vacuum and vacuumed source under boost.
Disadvantage I see is you will draw dirty crankcase through turbo under boost.
With all that said , I still am creating back pressure to pop off the push in oil fill cap occasionally.
If back pressure is building in the crankcase to the extent it blows the oil cap off means that the check valves either under vacuum or boost aren't working correctly. As a result backpressure building in the can doesn't exit out of the can back into the intake side. Or the vacuum source to open and close the check valves isn't great enough.
Vents like these will draw about 3 to five psi of vacuum if installed correctly on the inlet to the turbo or supercharger. The truck guys (Ford) vent cleaned air into the exhaust rather than back thru the turbo or the supercharger.
Last edited by dlandsvZ28; Dec 6, 2020 at 06:55 AM.
Reason: edit content
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