I should add to my previous post: The other concern would be the slope characteristics of the Honda engine's torque/HP curve. A typical tractor engine might put out its full RPM at, say, 2200 RPM. If you drop it to 1600-1800 RPM, the torque/HP curve are probably such that it's still putting out at least 70-80% of its full HP, and thus still has a good amount of torque for pulling wagons, field work, or any of those other jobs where we typically don't wind our tractors right up to full PTO RPM.
The curve of most automotive engines, however, would be quite different. Even if they put out their max HP at 2200 RPM (most would be much higher), when you drop it to 1600 RPM you're likely down to 50% or less of your full HP.
There's no magic between HP and torque - it's a linear relationship. The same HP at the same final output RPM will produce the same torque. It's rather that the way the engine's optimized/designed will vary at what RPM you see full HP/torque. And because HP is proportional to toque by an inverse unit of time (550 ft.lb. per sec.): to put out 50 HP and 5000 RPM means very little torque from the engine, while 50 HP at 2200 RPM means a lot more torque at the engine.
In summary: If you gear the 50 HP at 5000 RPM Honda engine down to 100 final output RPM output through some sort of transmission, and gear the 50 HP at 2200 RPM tractor engine down to 100 final output RPM through a different transmission, the output torque will be identical. But what happens when you throttle them down a little will vary greatly from engine to engine.
This post was edited by DanielW on 12/01/2023 at 10:24 am.
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