Posted by buickanddeere on November 25, 2007 at 11:53:08 from (216.183.138.208):
In Reply to: E85 octane and energy posted by K in Iowa on November 24, 2007 at 12:36:12:
The higher compression ratio gains on the powerstroke where the expansion ration is also greater. All other factors equal a high compression engine vs. low compression. Has lower combustion chamber pressure and low combustion chamber temps because more of the energy was converted to crankshaft power. I would be possible to get more mpg with a well tuned high compression 12 to 1 engine on E85 vs. an all fuel dog with 4 to 1 compression burning 87 octane. Cam timing and rpms can skew the results wildly. All octane means is the air/fuel mixture can be raised to a higher heat before self ignited combustion. Take a look on a chemical chart for the ignition temp of pump gas vs. aviation fuel vs.toluene vs. the alcohol group.
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Today's Featured Article - A Lifetime of David Brown Tractors - by Samuel Kennedy. I was born in 1950 and reared on my family�s 100 acre farm. It was a fairly typical Northern Ireland farm where the main enterprise was dairying but some pigs, poultry and sheep were also kept. Potatoes were grown for sale and oats were grown to be used for cattle and horse feeding. Up to about 1958 the dairy cows were fed hay with some turnips and after that grass silage was the main winter feed. That same year was the last in which flax was grown on the farm. Flax provided the fibre which w
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