Posted by LenNH on October 23, 2008 at 13:20:55 from (24.61.134.129):
In Reply to: F-20 Compression Range ? posted by Pete in Holland, MI on October 22, 2008 at 07:34:01:
All the dual-fuel engines had a "low-compression ratio," probably around 4 to 1, because the higher compression used with gasoline would cause serious knocking with kerosene or distillate. I have never seen this number publicized for the F-20, but there may be someone out here in Tractorland who knows. I have always wondered if the 2-bearing crankshaft would hold up to a 6 to 1 compression ratio (typical for gas). Lots of people got tired of the problems of using kerosene (two fuels needed; a nuisance to start on gas and then switch; need to keep the engine hot for it to run well; need to drain the carb of kerosene if it stalled and cooled off). Everybody I knew with F-20s back in the 40s used gasoline, but with the low compression ratio, I don't suppose the tractor put out too much more power than on kerosene. With a high-compression engine, this thing would be a tiger. It was anyway if on rubber, compared to its performance on steel.
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