Now I'm confused....I think I've either used the wrong name for something, or misunderstand something.
From what I understand, there's a hose going from the inlet rocker cover to the front of the plenum, with a one-way valve in it that allows flow from the rocker cover side through to the plenum side but not the other way. Blocking/removing this valve and hose will cause pressure to build up inside the oil system, correct? I mean completely doing away with it. Not just removing the valve but leaving the hose. Blocking off flow in EITHER direction.
Here is a picture of my engine bay (please ignore the black squares, just hiding previous edits as they're irrelevant)
In RED is what I'm talking about. I am suggesting that the flow in either direction of that hose be cut off.
In GREEN is the hose going from my exhaust rocker cover through to the bottom of my catch can
In BLUE is the hose going from the top of my catch can back to my intake piping, BEFORE the inlet of the turbo
As you can see, my inlet and exhaust rocker covers are connected by hose as well, allowing gas to equalise between them both. I know this may not be a PROPER catch can setup, but I didn't set it up and it works.
How will I be pressurising the crank case if I remove the ability for gasses to flow between the two points on the red line??