Posted by caterpillar guy on April 28, 2017 at 01:21:37 from (71.82.201.142):
In Reply to: Why 540 RPM? posted by In-too-deep on April 27, 2017 at 19:35:22:
If you divide the engine speed by 4 that will work out to about 540, and if you take the older slower speed tractor engines, and divide them by 3 you also get close to the 540 PTO speed. Another words 540 x4 is 2160 about what engines run today the same for the older engines 540x3 is 1620 or approximately what those ran back then. Though the premise of the 5-600 RPM's for equipment would also make a plausible method for this during testing. I don't doubt either way would have worked for the determination.
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