Heavy oils have dramatically lower octane. My research indicates that premium fuel does bfix the problem R+M method of analysis. Advance must be accurate, cold plugs, and a bit rich. Real time knock sensors would be good to tell the tale. Loose pistons transfer even less heat and melt quicker. one answer is piston cooling jets in the crankcase. Soild oil cooiling works. I have a CM450E Honda It will run for 5 minutes without piston cooling. Jim
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Today's Featured Article - Horsepower Defined - by Staff. Indicated Horsepower This represents the power developed in the enine cylinder as obtained from the pressure in the cylinders. This is pressure obtained from an indicator which shows cylinder pressures. Indicated horsepower does not represent the actual useful power delivered by the engine. Brake Horsepower This is the actual horse power delivered by the engine to the shaft. It is equal to the "indicated horsepower" less the friction of the engine. It is useful hor
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