Where I live we have epa formulated fuel to help emmisions, E10. Will adding a little more ethanol increase or decrease the octane? Will more ethanol make a leaner fuel/air mix? Will ethanol increase or decrease combustion temp?
In the winter we have winter blend. I think I read that butane is added. I get about 10-15% less milage using winter blend. My Jubilee needs more fuel(richer) to make horsepower to push show. From trial and error I've learned it needs 2 1/2 more turns on main jet. So is there more oxygen in the winter blend? Or does my jubilee need more fuel because of the cold air?
Without an exhaust gas analizer, which I don't have, how lean is too lean? How far past lean of peak can a person go without damaging pistons? Or should I run at peak? Or should I run rich of peak?
I have a 10 year old 20 hp kohler command. No way to adjust carb, no adjustable jets. Plugs are clean. Doesn't use oil. Runs and starts great. Uses about a gallon of fuel an hour. Has 1500 hours on it. When engine is hot, I turn it off, it sometimes may want to run backwards. Would that be a clue of carbon build up? Pre detonation? Perhaps too hot of a plug?
By the way, my old tractors are in good health. Both have been rebuilt, they don't use oil. Don't have black carbon deposits on plugs.
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