ls1 valve cover breathers...suck or push air out?

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06-19-2012, 09:28 PM

awd-rwd racer

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ls1 valve cover breathers...suck or push air out?

the breathers on the ls1 valve cover, are they supposed to suck air in or push air out?

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06-20-2012, 07:58 AM

redtan

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They suck in, that's why there's a filter so it's fresh but filtered air.

The PCV is what pushes vapors out of the crankcase, or better yet it gets pulled out by the vacuum of the manifold.

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06-20-2012, 01:40 PM

TyCZ28

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if you run a properly plumbed PCV system the breather is just hurting you more than anything. properly plumbed means it goes from the valve covers, into a pcv valve, and then to an oil catch can and back to the intake.

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