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Old 02-06-2023, 11:46 AM
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mklinger mklinger is offline
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Join Date: Nov 2004
Location: Charlotte, NC
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That filter has a diaphram in it, basically a one way valve. Under vacuum or zero pressure it remains closed. If crankcase pressure would exceed atmospheric it opens.
I suspect I would not have this issue with the 10's running to the air cleaner on my N/A motor but in other configurations, such as a boosted setup, if crankcase pressure built up and pressurized the the crankcase that breather would vent the pressure.

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