The conversion is (Ratio * 14.7) - 14.7 = gage pressue
14.7 is standard atmosphere, so you're likely a bit less and this may be off farther if you have some really wild elevation - the reason the conversion required you to subtract it again is because the gage you're using likely starts at 0 gauge pressure (if it's an absolute gage, it will read 14.something sitting on the bench and then no subtraction needed).
The ratio noted above puts you around 50psi. For some reason I thought that was the minimum to expect rather than correct pressure, but to run low octane fuels these had lowwwww compressions so I wouldn't be surprised if I'm backward and 50 is the right number. Also, I'm more familiar with the 22-36 version, and not sure it the ratio [the stroke didn't, but depending upon the shape in the head] didn't increase slightly as well as the bore.
All confused now?! :lol:
Oh, if I may highjack this thread for a second: Hi everyone! I didn't fall off the face of the earth, but between a whole list of things my mother needed done to her house in town [and while I had tools there, didn't want to drag them back a month later] and my wife's honey-do list as well as helping her study for a test to qualify teaching more subjects: well not much time to work on tractors or log in here. However, the engine is back in that 22-36, but still decapitated. The clutch too, but haven't tuned it yet to the new facings. Still taking plenty of pictures, but haven't uploaded them either.
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