Re: horsepower of a farmall 450

Posted by Jason Simmerman on July 14, 2007 at 06:21:31 from (71.168.48.140):

In Reply to: horsepower of a farmall 450 posted by bradley brackin on July 13, 2007 at 21:48:10:

Here comes a novel. With tractors flywheel HP doesn't mean dooky, torque is what does your work. That's why it was never advertised before. Marketing is a wonderful thing. In any event, horsepower is just merely a calculation of rotational torque thrown into an equasion. Well they say it's about 55 hp on the belt, but PTO is generally the same so we'll say it's 55 on the PTO as well even though the Nebraska test doesn't mention PTO HP. Well the formula to figure out hp is HP = (torque * RPM) / 5252. We can't get an exact figure because the only way to do that is to pull an engine out of a 450 and put it on a dyno machine but knowing this and the fact that you loose approximately 15% of your engine power through the driveline (industry standard on manual transmission automobiles, automatic transmissions loose about 20%.) That might not be the exact parasitic loss in the machine becase we are talking about a tractor not a car, but it'll get us close. So we need to know what the torque numbers of the PTO to start this equasion. Well we are going to assume the rating was at exactly 540 rpm on the PTO. Well that puts the engine RPM at about 1465 or so. Using the 540 rpm estimate we know by using the formula above that the PTO has about 535 ft/lbs of torque. Now take the engine rpm and the PTO rpm and see what kind of mechanical advantage the PTO has via gearing. Well, we figured that the engine advantage is about 2.7:1 so we take the torque reading from the PTO multiply it by 1.15 to factor in driveline loss and then divide the number by 2.7 which gives us about 227 ft/lbs of torque on the engine at about 1465 rpms. Throw that number back into our equasion and you get about 63 hp which is about roughly what the engine hp is of a 450. Granted this is done via rough estimations of driveline losses and the engine might actually make even more power at an engine speed greater than 1465 which the max rpm for the engine is 1600 I believe. But at least I feel it's relatively close enough that you have no more than a 10 hp error eithor way. This gives you a rough estimate.

Replies:

• Re: horsepower of a farmall 450 Hugh MacKay 18:19:34 07/14/07 (0)
• Re: horsepower of a farmall 450 Janicholson 11:02:43 07/14/07 (4)
  • Re: horsepower of a farmall 450 chadd 16:24:40 07/14/07 (3)
    • Re: horsepower of a farmall 450 Janicholson 17:19:09 07/14/07 (2)
      • Re: horsepower of a farmall 450 chadd 13:32:57 07/16/07 (1)
        • Re: horsepower of a farmall 450 Janicholson 08:52:41 07/17/07 (0)
• used your formuala for ih 300, correct me if wrong arthur ward 09:03:24 07/14/07 (4)
  • Re: used your formuala for ih 300, correct me if wrong D Slater 11:00:06 07/14/07 (3)
    • Re: used your formuala for ih 300, correct me if wrong arthur ward 11:29:01 07/14/07 (2)
      • Re: used your formuala for ih 300, correct me if wrong D Slater 13:40:01 07/14/07 (1)
        • Re: used your formuala for ih 300, correct me if wrong arthur ward 16:29:58 07/14/07 (0)
• Re: horsepower of a farmall 450 arthur ward 08:06:13 07/14/07 (0)

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