The same reason my 5.9 cummins turns 305 hp and my 8.1 Deere turns 285. It is in the design of the engine, yes sped has something to do with it, Fuel economy usually has to do how efficent the engine uses the fuel. I guy once told me that he and his friend each had a 20 ft boat, both identical in every way, except his had a chevy 454 and his friends had a 350, both had the same size tank but the guy with the 350 had to fuel up more often because he was using all his available hp. Lets say it takes 45 hp to pull a plow. Now if you have a 90 hp tractor it will use 50%of its hp to do the job. but a 50 hp tractor will use almost all of its hp to do the same job. Do you understand ? I hope some others will chime in and give a more scientific view. What is the RPMs of both tractors and bore and stroke?
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Today's Featured Article - The David Brown Rose Badge - by Samuel Kennedy. In the 13th century civil war was raging in England. Two English noblemen were involved in a conflict which became known as the War of the Roses. The Duke of York had as his emblem a white rose and the Earl of Lancaster had a red rose. Today the white rose is the official emblem of the county of Yorkshire and the red rose has been adopted by the neighboring county of Lancashire.
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