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I know that...do you see why pressure drop * cfm moved is a close number?
Say the manifold vacuum were 7psi (excuse me, I'll use 50kPa for easier calculations). Say we have a 2L engine, 1000rpm idle. 2L engine draws 1L every revolution. So you have 1 cubic meter of air each minute, drawn against 50kPa pressure. That's 50000J per minute, or 833W, slightly over 1 horsepower.
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