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Automotive intakes might be in the range of 20 (plus or minus 5) inches of mercury (inhg)at idle rpms. Typically it is less at higher rpms. It's not a pressure(psi), but a partial vacuum or suction. Not too sure whether our engines would be much different than that. Are you contemplating installing vacuum operated windshield wipers? (Who's old enough to remember actually using them?)
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