What gets folks confused is only looking at "horsepower" and not torque- horsepower is just a calculated number, based on torque (the actual force that moves the load) and RPM. "Horsepower", being a calculated number, can be manipulated- these days with the new "horsepower" quotas and regs, many engines can be easily made to fit under the 50hp threshold- just turn down the governor to a lower RPM. Same engine, torques just as much, but HP is less. We sold all of our I-R air compressors a couple years ago, and bought new under 50hp compliant rigs- they even say "49hp" on the back in big letters. Look at a D8- enormous torque, but very low RPM- so "horsepower" is only about 300- like that little small block Chebbie. Take the old 350 Cummins, and the derated 315- pretty much the same engine, but turned down to 1800 RPM- so "horsepower" calculates to less John Deere even has a section on their website that helps you derate their engines just by adjusting the RPM
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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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