Old tractors, hp was measured at the wheels, pto, or pulley accounting for all frictional losses.
25 hp Kohler is measured at the engine.
Then what throws people is the pulling force. If you gear something down, a small engine can generate a large force.
An example of getting a lot of force from a small engine is hydrostatic tranny or hydraulics on a log splitter. Whenever you generate a large force, you slow the speed. The more you slow it, the greater the force.
Then Briggs got in trouble for inflating hp numbers. So you can't always believe what you read. Another example of inflating hp rating a shop vac, 5 hp shop vac, 120v and 15 amps, numbers don't add up.
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Today's Featured Article - The Collection of a Lifetime - by Sherry Schaefer. The larest gathering of orphan tractors ever assembled by one collector will be auctioned off on May 15 in Rock Island, IL. Ed Spiess was a well known tractor buff who spent most of his time dreaming of rare and unknown tractors. His background as an agricultural engineer sparked his interest in the unique attributes of the models built from 1939-1959.
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