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About jd730 torque

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jake

04-06-2003 23:22:52




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i'm sure that you know more than me but problems i can see (besides my spelling) with the math to figure out tourque output are, first of all different engine desighns will differ even with same power (&revs) the other thing being that the input to the math at 1200rpm is not the point of which maximum torque occurs, and we all know the 730 is a proportioned against the hp a high torque engine, please don't bite my head of i'm only 15, to young to die.

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G Taylor

04-08-2003 06:35:53




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 Re: about jd730 torque in reply to jake, 04-06-2003 23:22:52  
Just out of curiosity, what is your fascination with torque and peak torque in particular? On a four stroke mechanical governor diesel the torque peak is likely 15% to 30% greater than torque measured at max HP. A two stroke Detroit diesel has an almost flat torque curve across the entire rpm range. This does give the illusion of being gutless if overloaded past full power and lugged down.

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G-MAN

04-07-2003 04:56:55




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 Re: about jd730 torque in reply to jake, 04-06-2003 23:22:52  
All engines produce their horsepower and torque peaks at two different speeds, but torque and horsepower are always equal at 5252 rpm, because of the formula used to figure horsepower. Horsepower measurements were devised to give a standard to judge the output of various engines. Horsepower is how fast an engine can do work. Horsepower is a function of torque, and can't exist without it. Torque is the measure of a twisting or turning force. You can have torque without shaft rotation, but you cannot have horsepower without shaft rotation, because there needs to be some kind of RPM to figure horsepower. A dynamometer measures torque, but is calibrated to show the results in horsepower. Tractor engines are rated at a specific RPM - commonly known as rated speed. This is the speed at which they can continually run and produce maximum horsepower without damaging anything. If you continue to pull them down, torque will continue to rise, and horsepower will also. Using rated horsepower in the formula will show you torque at that horsepower level. You could also figure horsepower at the torque peak by doing the same thing. I think that what's getting you is that you think a 730 should have more torque than the formula shows it does at rated RPM. If you would continue to pull the engine down past rated RPM, torque would continue to rise. 247.9 lb. ft. doesn't seem like much - a lot of passenger car engines make more - but when you figure the gear reduction that takes place between the crankshaft and the rear wheels, and the very low speed at which that torque is produced, you're putting a ton of torque to the ground. That is why two-cylinders lug so well.

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will

04-07-2003 07:23:35




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 Re: Re: about jd730 torque in reply to G-MAN, 04-07-2003 04:56:55  
Sounds like you did a wonderful job explaining torque. I was wondering if that was the torque figure for a gas 730 or a diesel or all fuel. If you have them, I would like to see the figures of the other fuel tractors for comparison purposes. Glad we have such knowledgeable people on this site.



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G-MAN

04-07-2003 07:38:58




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 Re: Re: Re: about jd730 torque in reply to will, 04-07-2003 07:23:35  
Will, you can figure horsepower, torque or even the RPM at which they're produced by using different variations of the horsepower formula. Horsepower = (torque x RPM) divided by 5252. I'm not much of a math major, but it's pretty simple algebra. If you want to figure an engine's torque at a specific horsepower, multiply the horsepower number by 5252 and divide by the RPM.



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will

04-07-2003 13:12:47




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 Re: Re: Re: Re: about jd730 torque in reply to G-MAN, 04-07-2003 07:38:58  
G-MAN From what I can configure about the formula that you gave the torque is not peak torque, but rather what torque is at rated engine speed. Is there a way to figure peak torque rather than torque at rated horsepower? Peak torque figure is really what I am after. Thanks for the help!



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G-MAN

04-07-2003 13:40:10




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 Re: Re: Re: Re: Re: about jd730 torque in reply to will, 04-07-2003 13:12:47  
I don't think there's any formula to figure peak torque, because it would have to be measured on the dyno. You'd have to continue to pull the engine down until a high point was reached and torque began to decrease, and map each torque number along the way. When you're done, you can connect the dots and it will show you the torque curve. We do this occassionally on tractors to make sure the torque curve is correct.

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will

04-07-2003 14:45:28




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 Re: Re: Re: Re: Re: Re: about jd730 torque in reply to G-MAN, 04-07-2003 13:40:10  
I may put it on a dyno because I am curious to know what peak torque is. What does your dealership charge to put one on a dyno? I have often wondered why peak torque was not posted with tractor specs back in the day. Seems as if deere would have been way ahead of the others in torque because of the long stroke.



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G-MAN

04-07-2003 15:50:33




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 Re: Re: Re: Re: Re: Re: Re: about jd730 torque in reply to will, 04-07-2003 14:45:28  
Our dyno charge is $25, but that's kind of negotiable depending on the customer. If it's a regular customer, he's probably not going to get charged. Be careful pulling the engine clear down, as lugging an engine excessively can damage it. We only do it in rare cases where we need to verify that the fuel system and engine are functioning properly. With high-horsepower tractors, it's also hard on the dyno.

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will

04-07-2003 16:32:03




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 Re: Re: Re: Re: Re: Re: Re: Re: about jd730 torque in reply to G-MAN, 04-07-2003 15:50:33  
Thanks. I will more than likley have it put on the dyno if my dealership is anything near that cheap of a price.



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