Originally Posted by
ED9man
Does the PCV normally need vaccuum to operate correctly? Or would it work going to a catch can instead of the IM?
No. It needs a vacuum source to open. Otherwise, it will just be a plug.
Originally Posted by
centerforce99
It works because the gases from the motor creates pressure that needs to be released which is where the PCV comes into play, not really a sucking but a blowing. It appears the catchcan works more as a bypass but I could be wrong. W/O a setup that works the gas has to find another place to get out, hence seals like the oil pan and what not.
The pressure will build up without vacuum. The blowing of the crankcase gases will not force the PCV valve open. It requires vacuum.