You're also making an apples and oranges comparison. If you double the size of your motor pulley, then you're also doubling the rate that you're moving grain. So you have doubled the work that is being done. Assume that your motor is able to start the auger and get up to operating speed with the larger pulley. It is now producing twice the torque and twice the horsepower as before. And it's drawing twice the power from your electrical service. Of course, the motor will eventually burn out under these conditions, but it is the nature of motors to produce as much power as is required, up to the point that they stall out.
If I drive up a grade at 45 mph, it doesn't matter whether I'm in first, second, or third gear. The horsepower produced by my motor is the same. In the lower gears, the engine produces less torque but more rpms than it does in the higher gears. HP equals torque times engine speed.
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Today's Featured Article - Gatherin of the Orange - by Rick Nikolich. In July of 1998 I was talking to fellow Allis Chalmers collector Mike Schilling about the annual "Gathering of The Orange" AC show coming up in August of 1999. He got this wild idea that we should get a convoy of AC tractors and drive them from Charlotte, Michigan 105 miles to LaGrange, Indiana.
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