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I300I350 HP vsFI300F350HP
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Posted by Harold H on June 26, 2004 at 19:47:22 from (205.188.117.22):
I can't find the post now, but a short time back, there was a post of Farmall 300 or 350 horsepower being less than the International 300 or 350 horsepower of the same fuel. The reason for the higher horsepower for the International versions is that all of the 300 and 350 Internationals turned 2000 rpm and all of the 300 and 350 Farmalls only turned 1750 rpm. All of these are CHP from Nebraska tests. F300gas #538 35.87db hp, 39.84belt hp, F300LPG #573 36.54db hp, 39.66belt hp, I300gas #539 39.48db hp, 42.84belt hp, I300LPG #574 40.09db hp, 44.40belt hp, F350diesel #609 36.76db hp, 40.23belt hp, F350gas #611 38.53db hp, 42.44belt hp, F350LPG #622 40.02db hp, 42.73belt hp, I350diesel #610 40.99db hp, 44.10belt hp, I350gas #615 40.57db hp, 44.94belt hp, I350LPG #916 42.87db hp, 46.68belt hp. The most probable reason for this is that most Farmalls operated at high constant load settings for long periodas of time and therefore were limited to lower rpm for longer engine life whereas the International utility tractors usually operated at varing power settings and were seldom used at full power for long periods of time. IHC later used this same idea on the 656 gear drive vs hydrostatic drive, whereas the 656 gear drives turned 1800rpm and the 656 hydrostatic drives turned 2300rpm. However, in this case the lower rpm was not to just conserve engine life, but, the higher rpm was used to give the 656 hydro approximately the same horsepower as the gear drive since the hydrostatic drive system itself was not nearly as efficient as a gear drive from a hp standpoint. Provided for information and comments. Harold H
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