An engine 1/12th the size but running 12 times as fast - has the same cubic inches moving around per second as a much bigger engine running slow. It's a matter of what's practical. Also a matter of efficiency. A typical HD engine makes its best efficiecy at the peak of the torque curve - often 1600-2000 RPM. Find a way to run it at 6000 RPM and it becomes a dog with fuel use.
I don't see any mystery here.
Older HD engines use to post horsepower as "derated" because they were designed to last long hours at a given power rating. A light duty engine will often post max power that the engine cannot sustain very long.
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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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1964 I-H 140 tractor with cultivators and sidedresser. Starts and runs good. Asking 2650. CALL RON AT 502-319-1952
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