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 - Madison's County - by Anthony West. Philip Madison has been a good friend of mine for quite some time. He has patiently suffered my incessant chit chat on the subject of tractors for longer than I care to remember, and on many occasions he has put himself out, dropped what ever it was he was doing, to come and lend a hand cranking handles, or loading a find onto a trailer. Although he himself has never actually owned or restored a tractor, he was always enthusiastic and always around helping with other peoples projects.
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