Get it from the intake mani...

 

I built a catch-can from an empty WD-40 can. I fiberglassed in 3 nipples ( two on top, one on the bottom ), and then painted it like a barbershop pole, but using red and black instead of red and white...

I haven't using it since I haven't built a intake/air filter system for the turbo yet. The catch can needs vaccum, and never boost, which can only be had between the air filter and the turbo's compressor housing/intake.

If you tap into the manifold ( intake ), then you'll get a vaccum, until you hit boost, then you'd actually be forcing presurized air BACK INTO the valve cover/crank case, which is the oppisite of what a PVC/catch-can is designed to do.

 

could you use a check valve?

 

No, b/c then the presure coming outta the valve cover will have no place to go ( but out the valve cover gasket, out the oil pan gasket, or the piston rings ).

 

No, turn the check valve around the other way, so it will only allow vacuum in, but close under boost

 

good question green! But one of the guys at my old school had a crx and never did any type of catch can setup. what would be the results

 

The vlave cover still won't be able to breath under boost when it needs it the most.

 

Ok, I'll take the question the next step....what exactly is getting hurt inside the crankcase if I leave the stock PCV setup? I'm running 9psi around town and I have no oil on my cheesy little breather filter...sufice it to say, if I am shortening the life of the motor any more that I have to, I will do it.

 

hell i think i did the worst i made a catch can out of a use a/c compressor drier and ran some lines work good and the product on top i have done that it works but fills up quick

 

Does anybody know this?