Okay so yesterday I was switching my V2 plenum out for a V3 and when I took it off there was a oily film on the top of my plenum. I'm not suggesting that the aftermarket plenum is to blame here. I think all of us have this crap in there no matter what plenum we have. First off why is this there? Secondly, I'm guessing this is what the oil catch catch can things are for but is there an actual way of stopping the oil and not just catching it. Thanks.

 

Assuming you're talking about the Kinetix plenum. It's molded, so it's not really oil, but residual Mold Release. This is so the finished plenum can be removed off the mold with ease. Think of a cake, where you have to butter the pan so the cake can come off easily. Same case here, the cake is the plenum and the pan is the mold.
Just use some paint thinner or acetone to remove it.

 

The oil is from the PVC valve. It vents the air from the crank case into the intake. It does that to A. Remove the gases from the crank case that blow by the rings. B. Burn those gases off to lower emissons. So there is no real way to stop it unless you vent your PVC to air.

 

you mean pcv, pvc is pipe

 

Thanks for the explination. So would one of the oil catch cans stop most of this stuff from going into my intake manifold.

 

Ya thanks

The catch cans will reduce the amount you get in the intake.