Posted by Jim Becker on July 24, 2011 at 09:32:27 from (173.57.144.251):
In Reply to: All Fuel C ? posted by IndianaRed on July 24, 2011 at 05:00:41:
For tractor models that had both distillate and kerosene options, I think the main difference between the two was compression ratio. They both needed the hot maniford, carb with an adjustable main jet etc. If you check the parts catalogs, you will find different heads and/or pistons for the two versions. Higher compression ratios for any fuel improve efficiency but is limited by preignition. Since each of the 3 fuels has a different octane rating, the compression limit is different for each fuel. As I recall, distillate requires a lower compression ratio than kerosene.
A company can produce an "all-fuel" engine by building it to the lowest grade fuel. Higher grade fuels in will be used less efficiently than if used with a higher compression ratio. In the '40s and '50s, most gasoline engines were designed for about 70 octane fuel. Octane rating of regular gas has been in the high 80s for a long time. That is what now allows substitution of higher compression pistons.
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