Crankcase Vents

Heads, valves, pistons, rods, crankshaft, etc...

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Josh222
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Crankcase Vents

Post by Josh222 »

The tubing for the front vents that go from each head to the center of the block needs to be replaced. I was wonder do I really even need those? It already has the tubes going from each head to the intake and the crankcase to the pcv valve. Do I really need the the second set on the front of the block or can i just cap them?
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vrg3
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Re: Crankcase Vents

Post by vrg3 »

Subaru seems to think you need them. Non-turbo motors don't have them, so my theory is that they're needed to make sure vapors move freely enough between the heads and the block..
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Legacy777
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Re: Crankcase Vents

Post by Legacy777 »

Yes, you need them. It helps equalize pressure between the heads and block. I'm pretty sure the STi motors have the center vent as well.
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