Posted by MarkB_MI on January 09, 2022 at 17:58:37 from (96.59.224.67):
In Reply to: What limits maximum RPM posted by CONSERVATIONMAN on January 08, 2022 at 17:23:45:
The short and simple answer is they didn't need to turn any faster. They were conservative designs in a day before finite element analysis and other engineering tools that allowed the design of engines with high power-to-weight ratios, and they were marketed in a time when there was no demand for high power-to-weight ratio tractors. Engineers back the made sure their designs had wide safety margins, because experience taught them that things broke when they didn't over-engineer them.
Certainly it was possible to build engines back then that would turn fast and put out lots of power. The Allison and Merlin aircraft engines had very high power-to-weight ratios, but they were complicated, expensive and maintenance-intensive. Tractors needed to be simple, cheap and reliable. Note that the standard for pre-war high-horsepower engines, the V-12 Liberty engine, only turned about 1800 rpm.
It's also important to consider piston velocity rather than rpm when comparing antique versus modern engines. An engine with a six inch stroke turning 1500 rpm has the same piston velocity as a engine with a three inch stroke turning 3000 rpm.
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Today's Featured Article - Grain Threshing in the Early 40's - by Jerry D. Coleman. How many of you can sit there and say that you have plowed with a mule? Well I would say not many, but maybe a few. This story is about the day my Grandfather Brown (true name) decided along with my parents to purchase a new Ford tractor. It wasn't really new except to us. The year was about 1967 and my father found a good used Ford 601 tractor to use on the farm instead of "Bob", our old mule. Now my grandfather had had this mule since the mid 40's and he was getting some age on him. S
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