Norm43, ok, I must have misread, I thought you had just rebuilt it. I am not sure but the pressuer may be listed in the nebraska tests, but not sure on that. When I said 15-30s may be close to that the reason is some 15-30s have a 3rd tank sitting with the fuel and gas starting tanks that held water to use to help keep the engine from knocking. it was an early water injection system. Some of the IH stationary kero burning engines from 3 hp up had that as well. I am not sure why they did that unless the larger engines did have a slightly higher compression ratio or it may have had something to do with the larger cylinder size or possibly just to quench glowing carbon bits stuck to the head. There is no doubt a formula you could use, but I couldn't tell you what it is. It may take a dang good calculator or a slide rule to do it. I would just go ahead and give it a pull by hand and if it feels like it is giving 10-15 lbs or more pull on the crank handle, it should run if everything else is in order. If I had to take a wild guess I would say if you belted it up and had it turning at 500 rpm with throttle wide open you might get 60lbs on the gauge, but you could get more! You would have to test all cyls at the same RPM, Or if you want to make it real simple, just get it ready to start and see if it does fire up! I didn't see mention of the year but if it was made before 1929 it was made to run on kero only so it might miss out some when it warms up running on gas all the time. If it was made in 29 or later see if the 2 manifold baffles are set to Gasoline or Kerosene. I used to run my 10-20 on kero and it did ok, just have to use a curtain on the radiator till the lower elbow is nice and warm but not hot. and drain the oil down to the center petcock the morning after running it.
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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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