Quote:
Originally Posted by Gen6cyl
Does the suction of venting to the intake relieve internal pressure better than venting to atmosphere? The lgx takes crankcase pressure to the intake tube rather than the intake manifold which has more suction.
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Negative pressure (relative to atmospheric) in the intake manifold will reduce the pressure in crankcase required to open the pcv valve, since the valve opens according to a static difference in pressure. Likewise, positive pressure in the manifold will raise the relief pressure threshold of the pcv. But, I imagine that when crankcase pressure surges, it does so by a lot, so the margins you're asking about are probably negligible.