I seem to remember that 22" was the sized recommended for tractors like F-20, 10-20 and H. My father had a thresher that we operated with a 10-20. The engines on these early tractors were BIG (about 280 cubic inches!!), but they didn't run very fast (1000 rpm, full-load governed speed). There wasn't much horsepower, but there was a lot of torque. That is why they would handle a brief overload without choking up the thresher. The H, on the other hand, had only 152 cubic inches. It gets its horsepower from speed. If it is pulled down below its governed full-load speed, it is easy to overload it and even stall it. It is a very snappy engine and does a great job as long as it is allowed to run up to speed. I can see how it would be easy to choke up a thresher with this type of engine running it.
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Today's Featured Article - Tractor Profile: Farmall M - by Staff. H so that mountable implements were interchaneable. The Farmall M was most popular with large-acreage row-crop farmers. It was powered by either a high-compression gas engine or a distillate version with lower compression. Options included the Lift-All hydraulic system, a belt pulley, PTO, rubber tires, starter, lights and a swinging drawbar. It could be ordered in the high-crop, wide-front or tricycle configurations. The high-crop version was called a Model MV.
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