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03-09-2001 10:38:23

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I know that my dad's 1953 Super C is around 22 hp, but that seems very misleading when you consider that some of the bigger lawn mowers are rated at 20-25 hp. Obviously there is no comparison of the two when put to work. Are there any torque numbers on old Farmalls? Super C in particular? Just Curious! Thanks -- Martin

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03-09-2001 18:01:21

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 Re: Torque? in reply to MWKellner, 03-09-2001 10:38:23  
It is also interesting to look at some of the Nebraska tractor tests on some of the walk-behind garden tractors of the 50's and 60's. They had Briggs and Stratton engines probably 5 hp or more and the actual drawbar horsepower was between 1 and 2 horsepower. Roger

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Keith Breuer

03-09-2001 14:29:25

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 Re: Torque? in reply to MWKellner, 03-09-2001 10:38:23  
You also need to consider that the horse power of a C was listed as drawbar horse power. Most modern lawnmowers list the engine horse power at crank shaft.

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03-09-2001 14:02:03

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 Re: Torque? in reply to MWKellner, 03-09-2001 10:38:23  

If you compute torque based on it's definition (Torque {ft.-#} = 5250 x H.P./RPM) and use the Nebraska Test # 458 data (Super C measured a max. H.P. of 23.67 at the belt, 1651 engine RPM)the torque value would be 75.27 ft-#. You can see from the formula that one of the modern high speed lawn mower engines rated the same H.P. (horsepower) but at an RPM of say 3600, their torque value would be 34.5 or less than half the value of the Super C. Of course, both the Super C and the high speed lawn mower engines probably develop their max. torque values at lower RPM's (although not too much on the Super C), so the actual value is somewhat greater. Since friction loss also results from the testing method (belt measurement) the torque at the flywheel would again be somewhat greater than this computed value.

Some Nebraska test books actually note the max. torque value determined from testing and I find it interesting to compare to other image or com-
petetive tractors. John

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Denny Frisk

03-10-2001 06:31:19

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 Re: Re: Torque? in reply to JOHN LITZELMAN, 03-09-2001 14:02:03  
John - Your absolutely right. The Neb. tests in about 1953 to 1955 included the engine torque ratings and the RPM. H's& M's had torque peak at 900 to 1100 RPM. The small air & water-cooled lawn/garden tractor engines torque peaks are at over twice that RPM. With the gear reduction in their transmissions they should pull about the same, but in actual practice they sure don't hold their RPM in a tough pull like the old Farmall's. I was always surprised how poor the old green 2-cyl. tractors performed on the low RPM torque tests. In actual field use they did better than the tests would make you think they would do. But NOT enough better to make me use Dad's old jd B instead of the Super H. I'd have prefered Horses over that old B.

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