the compression ratio is not a ratio of pressure. it is a volume ratio;specifically its the cylinder+combustion chamber volume at BDC/combustion chanber+cylinder volume at TDC. The compression gauge pressure for typical gas engines on tractors is ~ C x pambient x[(compression ratio)^1.4-1] wwhere C is between 0.65 and 0.75. ).67 seems to work well on the Ferguson Continentals and the N seried Fords The compression gauge pressure should always be measured with the throttle plate fully open.
So for your 7:1 compression ratio, if the ambient pressure is 14.7 psia , your compression pressure should be ~ 140 psi.
Having said that if the manifold pressure is 20 inches Hg vacuum, that"s about 4.9 psia so the compression pressure at idle would be ~ 48 psi.
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Today's Featured Article - Gatherin of the Orange - by Rick Nikolich. In July of 1998 I was talking to fellow Allis Chalmers collector Mike Schilling about the annual "Gathering of The Orange" AC show coming up in August of 1999. He got this wild idea that we should get a convoy of AC tractors and drive them from Charlotte, Michigan 105 miles to LaGrange, Indiana.
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