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 - My Ford Golden Jubilee - by Troy Estes. This article is about my '53 Ford Jubilee and a story that starts with taking the tractor to my brother's Starter/Alternator Rebuilding shop for a wiring fix. The generator was shot as well as all the wiring. I dropped off the tractor expecting a transformation from a 6 volt to a 12 volt system utilizing the original generator housing, and a total rewiring of the whole tractor. The front end center pin bushing was worn also so I ask that they replace it if they had time. Well, that’s wha
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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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