Thanks for the replies. At issue for me is torque. To say a motorcycle engine could pull as much as a JD 'R' just seems ludicrous, even if you could negate the gearing loss. The JD has much more twisting power than the MC engine no matter what RPM the MC engine turns. HP is a measure of work, not force. I found this quote on another forum and it makes the most sense to me:
Torque is how much work CAN be done.
HP is how fast it can get said work done.
Now this makes sense. The motorcycle in no way can pull what a 120 HP tractor can pull, but it it can get the same amount of 'work' done as the
tractor if you reduce the torque requirement so it can spin fast. I think a good analogy is if you hook up both to water wheels. The tractor could lift out massive buckets of water but not at a very fast rate. The MC could lift only small buckets, but at a much faster rate. In the end they would generate the same amount of water.
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