PCV Ventilation setups...

ReiKo

ReiKo

New member
What do you guys prefer?

I have also took the PCV and vented it right to the exhaust and plug the intake nipple...

I talked to many F/I guys and they said they both vent the valve covers to the exhaust...

Reason I am asking is cause my buddies car has a catch can on it... It goes from the intake/tb to the catch can and then to the PCV... But there is no breather on the catch can and everytime you get on the car... It pops out the dipstick... I researched it and came up with it coming from pressurizing PCV and crankcase since there is no breather and itpops out the dipstick...
 
what kind of car?
rick, me, phil and some others run a pcv with a valve cover breather.
alot of people won't do it cause they say its unmetered air. I use the truck retrictor so it actually is metered but I never seen a differance in afr
 
On my mustang I had 2 barbed nipples coming out the back of the valve covers, going to a tee, and the going to the cold air intake. It took care of my problem.
 
ReiKo said:
What do you guys prefer?

I have also took the PCV and vented it right to the exhaust and plug the intake nipple...

I talked to many F/I guys and they said they both vent the valve covers to the exhaust...

Reason I am asking is cause my buddies car has a catch can on it... It goes from the intake/tb to the catch can and then to the PCV... But there is no breather on the catch can and everytime you get on the car... It pops out the dipstick... I researched it and came up with it coming from pressurizing PCV and crankcase since there is no breather and itpops out the dipstick...
Click to expand...


for a car that has a pcv valve on it and it functioning correctly to blow the dipstick out something else is going on.

The breather deal with the unmetered air and what not i seen both sides argued well and am not bias to either set up. I personaly dont think the pcv works better or wore either way was the only time the valve opens is when there is suffucent crankcase pressure to overcome the spring tension in the pcv..

A engine really should never have more crankcase pressure than what the pcv can flow back. If this things pushing the dip stick out I'd look at rings/ring glands like mentioned above and the pistons.

Ifs its a forced induction set-up look for intake gasket leaks into the lifter valley...
 
His pcv valve could be clogged or some of the oil hoses. I know that I had to replace the pcv system (no valve) on my Volvo b/c of build up over time.
On my STi I vent the catch can, due to the fact that my intake is non-existant.
Many other subaru owners run catch cans and just have them vent back into the intake. Just as a way to keep build up from the valve and going through the turbo.

Nick
 
I think he needs a catch can with a breather on it... Cause there is no breather on it at all...
 
If it is venting back to the pcv valve then it is good. Just have him clean out the valve or replace it. Clearly that is his problem. Don't bypass the pcv valve unless you have to.
Or he could add a breather cover to the oil fill tube to let it vent.

Nick
 
on my trans am im running a k&n breather off of my oil fill as well as recircing the pcv to the inlet of the air filter, it hasnt had any problems yet. summit also sells a kit with one way valves that runs off the exhaust. it is y-d into each of the pipes and scavenges pretty well from what ive heard. ive been contemplating adding this instead of my current setup
 
LTLHOMER has the right idea, catch can with a breather is the way to go. Don't run the oil vapor back into the intake track it will build up and oil vapor leans out your tune and is unpredictable.

PAUL WILEY
 
Thanks Sir...

Looks like the best way is to cap the intake side and just vent the PCV side to a breathable catch can...
 
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