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Im getting ready to do a turbo kit soon in about 4 months, so im gettting ready. here's the deal right now, ive been reading about the pcv system and how to use a catch can, etc. well all the diagrams ive seen show the valve cover breather as a fresh air intake into the motor, well i have a cai and its currently vented to atomsphere, right, and even if i had the stock intake, it would vent to atomsphere also, so my valve cover breahter is blowing air out! its not oily/smokey, but is that a sign of a bad pcv valve? or is that normal... any ideas? thanks!! -- Jeremy

 
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Are you talking about the valve cover vent? Since there is somewhat higher pressure inside the head it tends to blow air out... I've had a breather on mine and it shoots out air and also bits of spray of oil. If you look close on your intake hose inlet to the intake/valve cover you'll see oil residue. And if you take your intake off you'll see it on the throttle body. This is the reason why I took mine off the intake since it pushes air out of the head more often than it vacuums. I'd rather put a little breather and clean that whenever it needs so it wont look dirty in your engine bay and save yourself a dirty throttlebody/intake manifold/valvetrain... It's not worth putting an oil catch can since it's not that much oil blow by.

 
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i dont think it vents to the atmosphere in stock form, it wouldnt be street legal. same with k&n filters on the breather, not street legal. its supposed to be a closed system

 
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yeah but under boost your getting alot more blow by and doesn't a breather and catch can help relive the pressure off the crank case?

 
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you are supposed to have a catch can...

open breather works, but it's a lil messy in some cases and is illegal.

A legal way is running it from the valve cover, to a catch tank, then the upper port to the pre-turbo intake pipe.

BTW - This has been covered, I even posted links of multiple products you can buy, along with my setup. I won't be surprised if this thread get's locked. Look into the other thread and you should fund what your looking for. It was a few pages long.

 
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Yeah, but its legal to run a turbo on a 2001 civic? In most cases the cat has to be removed - thats a federal offense right there....

The use of a breather filter works fine. However if you really DID want to do it the correct way you would need 2 catch cans. 1 to replace the PCV system, and 1 for the crankcase breather....But there really isn't enough room in our engine bays to do that anyways.....

 
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even with that setup, 1 catch can should be all you need--

my reasoning: a closed circuit PCV system would bring air in through the valve cover, and out the PCV hose. basically, with the vacuum always at the PCV end, nothing should burp up the valve cover inlet. one catch can from the crankcase to the pre-turbo intake, and one hose from the pre-turbo intake to the valve-cover.

That will be my setup.

 
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never heard of a catch can on the pcv line.. you sure about that?

 
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so does the catch can remove the pressure and blow by oil from the crank case?

 
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Nothing SHOULD come out of the crank breather? Sure about that?? That's where a lot of oil is sloshing around in there. Would you like to have your compressor / inlet housing coked up full of carbon / oil vapors? I know I wouldn't - effeciency would go down the tubes!! That's why its better to either just run a breather, or go with the 2 catch can setup.....But hey, its your car man.

 
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the catch can will remove the oil/vapors. and as long as that has a filter on it, or is connected to the pre-turbo intake, it will relieve pressure.

Here's a nice info page about how the PCV system should work on a turbo'd car:

http://www.beesandgoats.com/boostfaq/g2icturbo.html#PCV

this is how I've planned my setup.

 
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thanks for all the info, but ive read all that before i was wondering about the positive pressure coming out of the valve cover. i thought the dirty fumes went through the pcv valve then into the intake manifold to be recirculated through the engine. im guessing the pcv valve cant handle that ammount of flow and the excess pressure is relieved through the valve cover vent, and in stock form back into the intake manifold through the breather tube. so i guess my pcv system is working correctly, i do plan to upgrade it when i boost though. thanks guys!! -- Jeremy