Posted by Hugh MacKay on May 06, 2009 at 13:29:02 from (209.226.247.190):
In Reply to: Re: Horse power? posted by IH fan on May 06, 2009 at 09:59:20:
IH Fan: The gear reduction on all 350 Farmalls would be the same from flywheel to rear tires. I expect any given tractor could test differently (0 to 3 hp) on different days. They could have also used different tractors in each case for the test and had different results. In those days every tractor IH sold exceeded the manufacturers ratings. I don't think they sent a tractor to Nebraska that didn't exceed their own ratings. No two tractors are going to be excatly the same.
The different spread between PTO and Drawbar on a given model can be created by options such as power steering, differences in hydraulics, differences in tires, etc.
For example in the days of 350 there were planetary and clutch type IPTO options, IH eventually changed to clutch type as it was more efficient. Not only did it deliver more power to the PTO shaft, when disengaged it didn't require as much hp, thus more was delivered to the drawbar. Planetary type could rob power if not adjusted properly.
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