So are you saying the problem occurs when it is put into actual practice? But I carefully measured how much it took me to plow 2 acres with a 4020 pulling 5 bottoms. That's an actual test, but the D which I haven't bought, has not been tested.
I am assuming that a D can pull 3 bottoms in the same soil, but I might be wrong; in which case, the whole math is wrong. Hmmm..... Maybe it can pull only 2 bottoms. I better look into that one. Thanks.
Keep in mind this is engine horse power, not drawbar horsepower. Maybe, just maybe, that chain dive on the D gets its power to the gronund more efficiently than the power shift transmission on the 4020. I'm just guessing here--IF the D can pull more than half what the 4020 can pull with half the fuel cost. That's not certain.
I'm going to bring up another observation: Our 80, at 72 horsepower, is every bit the tractor the 4020 is, at 90 horsepower. That's not because the 4020's in bad shape either--it's fine. The older, low RPM engines are underrated. Take the old steam engines, for example. At the Wauseon steam convention some years ago I watched a 120 HP traction engine pull a 300+ hp bend-in-the-middle Steiger backwards, stalling it in the process. A third the horsepower out pulled AND killed the engine, both? Or take the engine that drives my shop: it's a "15" horsepower Reid. It has 750 cubic inches! It'd take a 15 HP lawn mower and throw it over a hill. There really is something to low RPM, high torque engines that will out perform high speed engines. That 80 will pull 5 bottoms at an idle. I've done it many times. The 4020 dies if you try. I realize this is another subject, but maybe it's related.
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