I know this is a dumb question but i have to ask it. I'm running breathers on both sides of the valve covers. Am i going to run into any problems with the pcv removed? I capped the manifold so there are no vacum leaks. I have not thrown a CEL yet. By the way i got two Moroso breathers from Schucks for $16.

 

Decide for yourself. The pcv valve is a check valve. It uses manifold vacuum to create an air flow through the motor via the oil channels that removes blow-by gas, carbon, and other impurities created within the internal combustion engine. It also keeps a certain amount of pressure on the rings to keep them from "flopping around" during the non-combustion cycles. Granted this flopping around may only be measured in 100 thousandths of an inch, but, over time it creates extra wear on the rings and cylinder walls. The reason for putting a filter on the breather side- (only under extreme rpm situations will there be any outflow on the breather side) - is to keep the intake air flowing constantly in one direction. When you accelerate, your manifold vacuum drops and the pcv valve will close, and all of the vacuum will be applied to intake. Then when you deccelerate it will build and the motor will use the extra vacuum via the pcv to "clean out the motor" and keep positive pressure on the rings. It is at the moment you accelerate again that a filter on the breather side is of benefit. If you have a filter on the breather, your motor will not have to waste any effort reversing the direction of the air flow through the breather.

I would keep your pcv valve, put a filter in the vacuum line to keep all of the ****e (blow-by gas, carbon, and other impurities created within the internal combustion engine) out of your intake, and put a filter on the breather side.

 

couldnt have said it betta myself... awesome decription mopower!

when i added the breather filter on the pass side (kept the pcv on the drivers) it smoothed my idle pretty good and the motor seamed to pull harder in the mid range area... nice little cheepo mod!

 

Thanks. I have always put a filter in place of the breather, and this was patronizing at best- I just wanted to get involved in a dialogue on the subject:

That being said, I've always known that having that chrome breather filter looks really cool, but doesn't net any gains unless you're racing on an oval. Why put one on? I don't know, but, if I picked up a 2007 this July/August, It'd have one on in short measure.