What I should have said was at 3000 rpm the vacuum gage indicates 10"hg.
vac.  At wot 4600 rpm it indicates 0"hg vac. The vacuum goes down
linearly from 10" to 0" with the corresponding increase in throttle
setting from 3000 rpm to 4600rpm.
Picture of compression gage and slide throttle attached.
A/c is an RV-7A
Correction, it is a 2.175 to 1 psru from Real world solutions model RD-1/B.
John Prendergast

This is the wrong way of saying it. Manifold pressure is specified
in absolute pressure terms. The word "vac" as in 0"hg vac is not used.

So what is the pressure in terms of inches of mercury at 4600 RPM WOT?

Paul Lamar ...No rotor no motor.

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