Posted by rustyfarmall on January 06, 2014 at 14:28:59 from (208.126.186.41):
In Reply to: HP vs Cu. In. posted by Just Another Old Geezer on January 06, 2014 at 14:12:29:
Also, keep in mind the horsepower of the older tractors was measured at either the drawbar, or the pto, or at the belt pulley. In other words, the horsepower was measured at the point where the work was being done.
Not so today. The engines of today have the horsepower measured at the flywheel, and NO adjustments are made in regard to horsepower losses through the drive train.
As an example, way back when in auto mechanics classes at the community college, we had a floor dynamometer. You drove the whole car onto that machine, strapped it down, and then put the car through its paces. The horsepower was measured where the rear tires "met the road"
The small block V8 in my Chevy was rated at 195 horsepower and it ran extremely well, but could muster up only 60 horsepower on that dynamometer.
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