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Re: New HP v. Old HP
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Posted by bbott on November 28, 1999 at 11:27:18 from (206.13.45.185):
In Reply to: New HP v. Old HP posted by Ryan on November 28, 1999 at 07:02:35:
Remember Horsepower is essentially
Torque ( how hard the engine can twist the driveshaft) Multiplied by RPM - How fast the driveshaft can be spun. Older engines had lots of torque, developed at relatively low rpm. They also have a much more 'forgiving' power band... they will keep pulling hard (lotsa torque) over a fairly wide range of RPM's... More modern engines OFTEN have less torque, but can turn a much higher rpm. They depend on a sophisticated transmission so they can be kept right in their powerband and will be very effecient there. In theory, If you have enough gears so you can shift into exactly the right one, and keep the RPM's just right..., horsepower will always win a tug of war. In REALITY, as soon as the high revving engine falls out of the proper RPM range, it's output will fall off dramatically and the low HP high Torque engine will pull it all over the farm. Please note that with the advent of electronic controlled direct-injected diesel engines you can get a very broad torque band and a high revver in the same package. bbott
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