I got rid of mine because I was concerned about pressurising the crankcase with the supercharger. I think the reality is though, that with 5-6lbs of boost that just isn't going to happen. Even with a bit more boost it would be fine.
So right now, I'm just venting both rocker covers to the catch can, then have a filter on the catch can.
I'm thinking of using the setup in the image below:
![Image](https://s20.postimg.cc/go4lfyhrh/revisedcatchcan_zpswgplgau9.jpg)
So essentially still vent the crankcase to the catch can, move the breather/filter back to the crankcase and run a new line to the inlet manifold via a PCV/check valve, and also to the intake side of the supercharger with a check valve.
The theory is this:
- At idle and other times the engine is in vacuum, the PCV will open and create a vacuum in the catch can. The check valve in the supercharger line will be closed meaning that the crankcase should be ventilated.
- On boost, or at least non-vacuum periods the supercharger should continue to ventilate the crankcase by pulling air into it's intake, but via the catch can, so hopefully not too much crap will actually go through it.
- Even if the PCV leaks a bit, the supercharger should more than compensate for it to stop the crankcase pressurising.
I can keep an eye on the vent at the rear and if it's filling with oil, I don't have enough ventilation.
Any thoughts on a better way to do this?