Here are the specs: For an IHC 22x38 with a hand feed and folding stacker: 16 hp. With a wind stacker, self feeder, and weigher, it says "McCormick-Deering 10-20", which was 21.6 belt hp. On the 28x46, those went up to 22 HP and "McCormick-Deering 15-30", which is 32.86 BHP. The cylinder RPM depends on the belt speed of the tractor and on the diameter of the pulley on the tractor. Which one you need for a thresher varied with the crop; both those threshers had an 8 1/2" face main drive pulley; available in 7, 8, 10, 11, 12, 14, and 15 inch diameters. You selected the proper drive pulley based on the tractor; of course different sizes were available there as well. Your IHC dealer could no doubt assist you in making the proper selection for your crop and tractor; that expertise is now hard to locate. Tractors had different belt speeds. Here is a selection available to me right now, and the column format will probably be mangled: tractor BFM pulley RPM W-12 BFM: 2730 RPM: 787 10-20 BFM: 2575 RPM: 645 W-30 BFM: 2695 RPM: 675 W-40 BFM: 2627 RPM: 599 WD-40 BFM: 2580 RPM: 588 Super A BFM: 2574 (8 1/2") RPM: 1157 F-300 BFM: 2759 (9 3/4") RPM: 1081 (max @ full load) The HP requirements for a thresher are quite modest; since they were stationery, you don't have a loss for moving anything. The capacity was likewise low, compared to more modern machines. It was a slower-paced time. You could run a 20" thresher with a Super-A; an H would be easy. Getting the thresher tuned to work right is a skill. Hopefully, someone who knows how can help you learn.
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