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Tractor Talk Discussion Forum

4020 engine torque??

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raleigh

12-27-2006 21:14:58




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OK, I know that the 4020 engine put out 95 HP PTO power, but what is the Torque spec for this 404 motor??




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Thack

12-28-2006 09:38:10




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 Re: 4020 engine torque?? in reply to raleigh, 12-27-2006 21:14:58  
Torque=horsepower X 5252 / rpm so as an exapmle.

95 X 5252 devided by 1600 rpm = 311.837



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buickanddeere

12-27-2006 22:00:20




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 Re: 4020 engine torque?? in reply to raleigh, 12-27-2006 21:14:58  
HP = torque X RPM/5252



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jdmaris

12-28-2006 11:31:43




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 Re: 4020 engine torque?? in reply to buickanddeere, 12-27-2006 22:00:20  
I've got a question about the calculations. I'm aware of the engine-math - but never had to think too hard about it. Why are most engine peak torque specs at low RPMs and the peak horsepower specs higher? The formula you are using - also states that horsepower and torque are the same at 5252 RPM. So, take a 276 cubic inch Deere diesel engine in a 6215 tractor - rated at a max. torque of 245 lb. ft. at 1300 RPM. Same engine has peak horsepower of 80 at 2000 RPM. If you were able to run the engine at the proposed 5252 RPM - would torque come down - or remain constant? Same question with the Deere 7220 tractor (more like a 4020) with the 414 c.i. engine rated at peak torque of 330 lb. ft. at 1300 RPM and peak rated horsepower of 104 at 2000 RPM. Also - as I understand it - most tractor companys post peak torque specs 800 - 1000 RPM high in order to provide a good torque-curve when lugged down. So, does that mean a Deere 414 engine listed with a peak torque of 330 lb. ft. at 1300 RPM actually holds that torque at 500 RPM? It doesn't seem possible - just going by engine-math formulas I've read.

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low budget

12-28-2006 15:48:24




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 Re: 4020 engine torque?? in reply to jdmaris, 12-28-2006 11:31:43  
Why does peak torque occur at lower RPM than peak HP? The simple answer is volumetric efficiency. As the engine speed increases the cylinders don't fill quite as much, say only 70% instead of say maybe 85% at peak torque RPM. This applies to injection pumps too. Does that clear it up some?



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RodInNS

12-28-2006 13:42:53




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 Re: 4020 engine torque?? in reply to jdmaris, 12-28-2006 11:31:43  
Not sure I'm following your question exactly.... but, peak power falls in the 1800-2200 range, depending on the engine. Peak torque will fall in the 1200-1600 range, again depending on the engine. If you follow the calculations through, you'll find that the torque at peak power is far less than the peak torque. That could range anywhere from 10% up to near 60% depending on the engine, and that's what they like to term torque rise these days. Must seem impressive to put a number like that on paper. On the other hand, when the engine is at peak torque, power has about gone to hell, and might be half of rated power. There were very few engines, (the old square Fords being among them) that carried their torque from idle to rated power. A lot of them had torque rises in the 12-17% range, which didn't make a big peak number... but they'd pull their holes out right off idle, and go with it. That's something that a lot of the engines that put big numbers up can't do.... Clear as mud?

Rod

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buickanddeere

12-29-2006 00:43:08




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 Re: 4020 engine torque?? in reply to RodInNS, 12-28-2006 13:42:53  
At highewr rpms there is less time to fill and empty the cylinder per stroke. A combustion chamber with a lighter fresh air chrage burns with less heat/pressure/thrust on the crankshaft. Peak HP rpm is where the engine pumps the most airflow per minute. Peak torque is where the engine pumps the most air per stroke. Just past peak torque rpm is usually where the engine is most efficient. Running (good) the engine at peak torque rpms v.s beating an engine by lugging (bad)it at peak torque rpms are two different modes. "Torque Rise/Power Bulge)" used to be a result of an engine's ability to pump air. Now with computer controled fuel injection rate/timing and variable boost pressure. The torque peak can be "flattened" or "peaked" as the marketing department sees fit. New veicles often flatten 20-75 lb ft off the peak torque in order to increase drivetrain life.

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