Re: Re: Re: Torque and Horsepower

Posted by Jim Nation on January 30, 2002 at 17:48:13 from (12.253.15.64):

In Reply to: Re: Re: Torque and Horsepower posted by Don Wadge on January 30, 2002 at 14:29:48:

In the example you have given, two identical trucks with different engines at 60 mph. They both are delivering identical hp to the wheels. However assume the lower torque engine is gasoline, it is probably geared to run in high gear at 60 mph near it's peak torque , and generally best efficiency, at perhaps 3200 rpm. The other is a diesel, geared to run at it's most efficient point, generally below peak torque, but much lower perhaps 1800 rpm. Lets say both are producing 200 hp. The gas engine is producing 656 ft lbs of torque (a big mother of a gas engine), The diesel is producing 1167 ft lbs not atypical of road engines. Now when you increase the speed to 62 mph as a rule the hp required increases by the ratio of the squares of the speed or roughly 7 percent. The gas engine, already at its torque peak cannot accelerate the load without shifting down a gear, now, the diesel may not have to shift since it has additional torque available w/o shifting. Both are however producing 214 hp more or less.

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