Posted by MarkB_MI on January 29, 2011 at 04:40:14 from (166.217.140.6):
In Reply to: HP??? posted by dave2 on January 28, 2011 at 13:32:13:
You can make a lot of generalizations, but horsepower is horsepower. Two engines producing the same horsepower will do the same amount of work in the same amount of time IF you can keep both engines operating at rated power. But comparing the output of a light-duty automotive engine with a heavy-duty truck or tractor engine is apples and oranges:
The light-duty engine is designed to operate at rated power for only a brief period. The heavy-duty engine can operate at rated power indefinitely.
The heavy-duty engine probably has a much wider power band than the light-duty engine, which means it can operate close to rated power over a wider rpm range than the light-duty engine.
With regards to tractors, the ability to use the available power becomes an issue. A more powerful tractor of the same size and weight as a less powerful tractor may not be able to do any more useful work because it can't get the extra power to the ground.
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