ref. C.H. Wendel, Nebraska Tractor Tests, shows 620 propane as 8.1 to 1 compression ratio, gasoline not listed, all-fuel as 4.78 to 1 compression ratio. I beleive the 630 was not tested as they used the same engine as the 620's. I haven't checked the Nebraska tractor test lab web site but have been told many of the test results are available on line in there complete form. hope this info is of some value to you LeRoy
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Today's Featured Article - A Lifetime of Farm Machinery - by Joe Michaels. I am a mechanical engineer by profession, specializing in powerplant work. I worked as a machinist and engine erector, with time spent overseas. I have always had a love for machinery, and an appreciation for farming and farm machinery. I was born and raised in Brooklyn, New York. Not a place one would associate with farms or farm machinery. I credit my parents for instilling a lot of good values, a respect for learning, a knowledge of various skills and a little knowledge of farming in me, amo
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