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Re: PCV Crankcase Ventilation Measurement Specification
Posted to Technical Discussion Forum on 4/9/2018

Having no experience with European vehicles, I don't have an answer to your question but the figures you quoted - 1.5 inHg / 3.5inHg is about right for domestic engines if it was inches of Water Column, that is 1.5 inWC / 3.5 inWC.

3.5 inHg is about 1.7 psi,... Login to read more.