Thread: Installing an oil catch can on ve

This should help clear up how the ve is setup from the factory.

ahh i see, simple pic. great

Sorry man I thought you had a DE (late at night and didn't see the VVL badge/section)

If you go to install the catch can install it between the VC and intake piping. Also look into installing one between PCV valve and intake manifold.

Maybe I can be of some help.

If that's what you've been reading, then you're being confused. Or you're being confusing to us...

The small PCV hose does go from the valve cover to the intake manifold. That is the way it is done. Not many people put a catch can between there. A few do, but I doubt you found those threads?

I think what you're talking about is the WOT section of the PCV system with the larger diameter tubes. NO ONE runs those to the intake manifold. That is a bad idea. If that's what you've been reading, then you've been finding some cray shit. Do not do that!


This, along with your picture, makes it sound to me like you're trying to retro-fit a catch can like the DE engines have. This is basically pointless, because you already have a catch can setup in your valve cover. The old DE catch can has been made redundant. If, for some crazy reason you just insist on having a catch can in your engine bay then sure you can go ahead and do as you've planned. It will not be worth the expense and clutter if you ask me, but it is up to you. You certainly won't be making things worse. But I'm not sure you'll be making things too much better either. The stock VE already have plenty of oil baffling in both the small PCV hose section and the larger WOT hose sections. I don't see the need to add any catch-cans on a stock or fully modified N/A Ve setup. I just don't.

Could you explain to me how this would be any different compared to running from the block to the CC then from the CC to the VC

Because if you filter the oil from the air BEFORE the valve cover, it will just re-mix with vaporized oil in the VC again and you've accomplished not much. If you do it after the valve cover, then you might be accomplishing something.

All i would be doing is seperating the oil/gas vapors from the air, catch it in the can, and allow the air to go up to the valve cover. The oil seperator in the valve cover serves the same purpose as a catch can but instead of seperating the unburnt fuel vapors from the oil it recirculates it back into the intake.

No, that's not how the oil separators in the valve cover work. They separate the oil and fuel vapors from the air and allow it to drain back into the head (and then on to the block) and in theory only fresh air leaves the valve cover headed for the intake.

Catch cans are seperators, but not all seperators are catch cans.... Deep thoughts that make you go hmm.

so then it doesn't matter if i run it before the valve cover or after the valve cover..