Posted by MarkB_MI on November 14, 2009 at 04:03:02 from (32.178.19.112):
In Reply to: Horse power??? posted by dave2 on November 14, 2009 at 00:09:53:
The transmission must be able to handle the engine torque, not necessarily the horsepower. Power equals torque times RPM. Now you can't increase horsepower by changing the gearing, because you won't have more horsepower than what you started out with: As you increase the torque through transmission gearing you reduce the RPM and horsepower stays the same (minus friction loss).
HOWEVER, tractors are normally rated at the PTO at 540 RPM. So, if you have two tractors that have the identical engine, and tractor A produces 540 PTO RPM at 2300 engine RPM, and tractor B produces 540 PTO RPM at 2100 engine RPM, tractor A will have a higher PTO horsepower rating than tractor B. Even though the engines are identical, tractor A produces greater PTO horsepower at the rated rpm.
Another thing to consider is that it doesn't take much of a modification for an engine to generate a bit more horsepower. Different carburetors or injectors, different cam timing, compression ratio or governor settings can be used to squeeze a bit more power out of an engine. Back in my yachting days, I owned a 120 HP Evinrude outboard motor. Looking through the parts breakdown, I found that the only difference between the 120 and 140 horsepower motors was the carburetor bodies. Of course, OMC charges several hundred dollars more for the 140 HP motor, even though it doesn't cost them a nickel more to produce than the 120.
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