The way an engine runs is mostly a function of the heat value present in the fuel. BTU (Bristish Thermal Units is the measure). It is more commonly called the heat of combustion. Heck these old tractors have run on some real garbage over the years. The original Farmals ran on a middle distillate and that octane varied by as much as 10 numbers. The first octane numbers were run only on a RO engine , the MO engine didn't even exist back then. Ethanol has a low heat of cmbustion and doesn't run as well as regular gasolines will. It has a higher octane value, but that octane doesn't help performance.
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Today's Featured Article - The Ferguson System Principal An implement cutting through the soil at a certain depth say eight inches requires a certain force or draft to pull it. Obviously that draft will increase if the implement runs deeper than eight inches, and decrease if it runs shallower. Why not use that draft fact to control the depth of work automatically? The draft forces are
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