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Re: Re: Re: Super C specifications and horsepower
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Posted by Steve - IN on November 30, 2003 at 16:46:02 from (12.222.30.13):
In Reply to: Re: Re: Super C specifications and horsepower stuf posted by Hugh MacKay on November 30, 2003 at 13:45:56:
Hugh,
They still do the Nebraska tests - and if you want to sell your tractor in Nebraska, it has to run through the test. Not all tractors are sold in Nebraska, though, and there's the rub. Most of the ratings you'll see now are SAE engine horsepower, which is going to be a higher number than PTO horsepower, and doesn't jive with SAE horsepower numbers before about 1970. About that time the SAE allowed testing without accessories, like hydraulic pumps and alternators. They also did tricks like allowing 10W oil in the engine being tested, and maybe without water pumps, but I'd have to look that up to be sure. The latest trick they have in cars was using German PS horsepower, which is slightly inflated versus even present day SAE horsepower - there was a flap recently about Jaguar cars advertising that rating method. More info -- I was at the local JD dealer to pick up some parts for my 425 lawn tractor and picked up a brochure on the 5x20 series of utility type tractors. They have a 5220 which they rate at 45 PTO (I'm guessing that's a Nebraska result) and 53 engine horsepower (they also rate them in KW to make comparison to Oriental and European tractors rated in Newton Meters or DIN). Anyway, the 5220 with 45PTO HP @2400 = 45*5252/2400rpm = 98 ft/lbs of torque, or only slightly more than Tim's Super C, or my Farmall H. If I compare it to my old JD 60 popper, 38 PTO HP * 5252/900rpm = 221 ft lbs. of torque versus the 5220's 98 ft./lbs. -- which makes me chuckle. If we paid around 1500 bucks for Tim's Super C versus around $27,000 for a new JD 5220 and saw only 18 ft lbs, or a 20% difference in torque - we'd be pi**sed!! Ha! Another good reason to keep those old tractors running. BTW, I've got a 10' rotary hoe and use it as what they call a pasture renovator/hole puncher in our clay. I've rigged a hitch to pull it behind the bush hog behind on my JD 60, or the finish mower on my H. Neither one of them seems to notice the difference.
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