Posted by Paul from MI on January 18, 2010 at 16:38:13 from (204.106.244.65):
In Reply to: Different tractor fuels posted by Robert J Kountz on January 18, 2010 at 16:25:46:
They were less volatile fuels than gasoline, and in the early years were much cheaper. Depending on the grade they wee similar to kerosene. When crude oil was refined by distillation a fixed percentage of the crude oil boiled at different temperatures and these fuels did not have a lot of uses, therefore were a surplus and much cheaper than gasoline. There were various problems associated with using them, but the cost savings was substantial and most tractor makers developed ways to use them. With the development of catalytic cracking during WW II this all changed. A much higher percentage of gasoline was available from crude oil and the cost advantage of the lower grade fuels disappeared. Therefore many of the older distillate or kerosene or all-fuel tractor were re-fitted with higher compression pistons and cold manifolds to get the maximum power available from using gasoline. Ironically there are more BTU's of energy available from a gallon of kerosene than a gallon of gasoline, but due to the anti-knock properties of gasoline an engine can develop more horsepower on gasoline. This is not a very scientific explanation, but is is the basics of the issue. Paul
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