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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