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The rush of the fuel/air mix by the PCV hole in the intake, carb base plate, where ever, creates a vacuum on the PCV valve, so that the PCV system also works under acceleration, and there is enough vacuum under most other conditions, such as cruise, that it's actually working most of the time. At some point in spirited acceleration the PCV system may not be able to handle all the blowby. This is why you see puke tanks, scavenging systems that operate on header collector negative pressure, etc.
My 2 cents...
Dan
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Do you know why they call it "PMS"? Because "Mad Cow Disease" was taken. --Unknown, presumed deceased
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