Quote:
Originally Posted by whaler
BTW, why is only one side of the V attached to a catch can? Is the other side valve cover negative pressure by default?
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One side (the catch can/PCV side) is negative pressure because it's attached to the intake manifold, where there is vacuum. This evacuates the crankcase. The other side is attached to the intake air tube (ahead of the throttle body) and allows replacement air to be drawn into the crankcase. This way, air flows in one side and out the other.