Posted by LenNH on February 10, 2009 at 09:47:20 from (71.235.191.159):
In Reply to: Farmall M RPM posted by IHdude on February 10, 2009 at 07:37:11:
Full load RPM 1450. Don't know high-idle RPM. Some of you fellows out there who work with these things all the time probably can tell us. In "my day" I used a little worm-drive "tachometer" with a rubber tip that you could put into the end of the PTO or in the center of the pulley. You had to calculate the ratio of PTO or pulley RPM to the engine speed. Don't have M numbers here, but will use F-20 as example: Pulley speed 654 RPM at 1200 RPM full-load on engine. 1200 divided by 654 = 1.835. If the pulley were running at 675, multiply 675 x 1.835 for engine RPM. You can divide the other way, too, to get pulley speed for a particular engine speed. The specs for these tractors often gave the "high idle rpm," which was easier to adjust than full-load because the only way to get full-load RPM with one of those primitive "tachometers" was to 1) stand next to the pulley while the tractor was operating a machine that provided a load, or 2) measure PTO speed while tractor was running something on the belt. I'm discounting walking behind the thing while it's plowing or something like that! I don't know much about electronic tachs, but I assume that any one of those engine analyzers that hook up to a battery ignition system would give you an instant readout of RPM. I have a small one that I bought 30 years ago, when it was still possible to tune up your car, and I know that it was an easy hookup to get RPM while adjusting idle, carb idle mix, etc.
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