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Old 02-02-2012, 02:48 PM
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Think of it like this. A fire is built in a steam locomotive so it's air entry is only on one end. The PCV works one in the same, vacuum is pulling it from one side of the engine. On the other side is a vent that pulls in air while the valve is working at low RPM high vacuum. At wide open throttle where there is no vacuum the vents role reverses and the blow by exits out of the vent since there's no vacuum to pull in the blow by.
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