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Re: 4020 engine torque??
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Posted by jdmaris on December 28, 2006 at 11:31:43 from (69.67.230.157):
In Reply to: Re: 4020 engine torque?? posted by buickanddeere on December 27, 2006 at 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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