Posted by Bill(Wis) on October 15, 2022 at 09:29:38 from (174.192.74.109):
In Reply to: Re: Engine speed posted by MarkB_MI on October 14, 2022 at 16:44:05:
Many of the old school tractors had relatively long stroke engines. I can come up with one that didn't and I've found it interesting to compare with a much newer tractor. The WC Allis Chalmers in its gasoline version had a 4'' bore and a 4'' stroke resulting in 201 cubic inches of displacement. It produced about 30 belt horsepower at 1300 RPM. The Kubota M6800 had a 3.856'' bore and a 4.331'' stroke and 202 cu in displacement. Not very much difference at all. It produced 62 PTO horsepower at 2600 RPM. When considering the probable friction loss on the belt tests these engines were almost identical in size and the later one was able to crank out twice the horsepower at twice the RPM. Allis Chalmers did start cranking up their RPMs to get more horsepower but reportedly ran into vibration issues with some of them. I think the solving of these vibration issues contributed to the modern day high RPM engines which produce much more hp.
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