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

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Old 06-19-2012, 09:28 PM   #1
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Default 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?
93 rx7 touring
LS2/t56 tranny, custom turbo headers, master power t76 turbo, tick performance cam, ported 317's, ls6 intake manifold, upgraded fuel rails, 80lb injectors, 2bar sd, tuned by nick at back yard turbo.
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Old 06-20-2012, 07:58 AM   #2
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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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Old 06-20-2012, 01:40 PM   #3
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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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