cliffyk

If running f/i you can use a check valve in the plenum to PCV valve line to prevent boost from overwhelming that PCV valve blowing back into the crankcase. NAPA used to have a good blister packed selection of them for various hose sizes.

uberstang1

At this point im thinking about just doubling up on catch cans, run one close to the pcv then another close to the plenum and maybe a check valve that sounds like a good idea.

oxfordgt

PCV valves are check valves. They only open when positive pressure pushes on the bottom of them. Take one and try to blow into the top of one. SVO just seal better against boost.

Romer

why not just run the lines directly from the covers to intake before the blower? wouldn't that create constant vacuum sucking out any gasses with no issue of boost in the crank case?

cliffyk

It would, however then all that crap will be going through the blower, and i/c if you've got one; that would be one heck of a mess...

On a serious race car driven or trailered to the track, yank it and put some of those cute little mini-K&N breather caps on there--they oil will be being changed often enough that it won't matter;

On a DD street car leave the PCV system intact and use catch-cans and check valves as needed--unless you want to "clean up the engine bay", as seems a popular pastime, in which case just make sure you drive it 25+ miles at highway speeds at least once a week (3 or 3 would be better), and keep the oil clean...

uberstang1

The passenger side cover actually does go to the intake tube before blower but it never pulled any oil at all, but the pcv was crazy excessive even with the catch can just dont want that on the new motor. Ill run two catch cans to where the battery is and
Aybe between that and the extended hose lengh ill be ok

phoenixfriend84

Why not run it into the exhuast? I'm trying to remember where an old builder told me to get the valve from but its called an anti flashback valve. He put a 5.0 into a Dodge d50 and run his that way. The valve prevented exhuast from traveling through into the crankcase and once running created a vacuum in the crankcase. It was a factory PCB system on something but I can't remember what. All you do is weld a bung onto your exhuast and run some pipe.