Re: Horsepower Question

Posted by MF Poor on March 07, 2007 at 14:55:26 from (67.141.0.126):

In Reply to: Horsepower Question posted by Ben Shipley on March 07, 2007 at 06:44:32:

A few more thoughts. University of Nebraska test's were used to determine ACCURATE PTO and drawbar HP ratings, as well as fuel efficiency. They supplied manufacturer's CLAIMED engine HP ratings, but did nothing to confirm those numbers. (Would have been virtually impossible without removing engines and testing on an engine dyno.) They were after the MEANINGFUL numbers....The power a tractor could deliver to the ground or to a PTO driven implement. For as long as I can recall, FARM TRACTORS are primarily advertised by PTO HP, with engine or drawbar as suplimental information. It seems as if it's been since the compact tractor market started to thrive that we get pages and pages of numbers and statistics to baffle the unfamiliar buyers.

"Magic formula" percentages to convert one rating to another are "guestimates". The percentage isn't constant from engine to engine. They'll get you "in the ballpark", but don't rely on the percentages from a known engine/tractor to "fit" the next tractor in line.

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