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John Deere Tractors Discussion Forum

Definition of Lugging Power

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08-18-2003 14:12:54

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I hear people all the time talking about how great the lugging power is on the old 2 cylinders. I've never fully understood the term however. Can anyone state a definition? Thanks.

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08-18-2003 21:17:08

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 Re: Definition of Lugging Power in reply to Tye, 08-18-2003 14:12:54  
Lugging power is the increase in torque but loss of power as total airflow per minute drops but each cylinder gets filled fuller. Peak torque occurs above max volumetric efficiency. Peak torque and usually economy occurs at 2/3 to 3/4 of peak HP rpm.

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Thank you for all the gre

08-18-2003 18:37:06

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 Re: Definition of Lugging Power in reply to Tye, 08-18-2003 14:12:54  
Thanks so much --God Bless! --Tye

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John T

08-18-2003 18:02:20

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 Re: Definition of Lugging Power in reply to Tye, 08-18-2003 14:12:54  
Great question there Tye. What many mean by Lugging Power, is how well the old 2 cylinder Deeres can drop to very low RPM's, yet still work and pull a load and deliver good torque to the rear axles. The reason is they have a HEAVY FLYWHEEL (stores energy) and LONGGGGGGGGGG STROKE and the longer the stroke the longer the lever arm which means more torque (turning/twisting power). Its like when you use a cheater pipe for a long lever arm and apply more torque to a bolt head. With a long stroke, theres a long distance between the cranks center out to the the connecting rod throw, so as the piston pushes down, theres a lot of torque at the cranks center.

Next, Horsepower is a function of Torque X RPM. On the high RPM engines (like Olivers and IHC's etc) much of the derived HP is due to the high RPM's instead of the torque, therefore, as RPM drops, HP drops rapidly and with their short strokes, low end torque aint so hot.

HOWWEVER, the JD's are already at relatively low RPM (compared to Ollies) so when it drops off some, the low end torque is still good and the HP is still decent compared to even at their max RPM. GOOD LUGGERS

I hope this answers your question. Feel free to e mail or call me with any more questions.

Good Luck n God Bless ya

John T Nordhoff, Retired Engineer in Indiana

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08-19-2003 13:40:07

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 Re: Re: Definition of Lugging Power in reply to John T, 08-18-2003 18:02:20  
HI JOHN- My Son's a "Boilermaker"...Starts His 4th yr next Monday.... Comment You made about Torque Vs HP, The Farmall Super M made it's peak torque at If I remember right 950 RPM according to Neb. test. Even the high winding Super H held torque all the way down to 1000 RPM, SM was something over 360 #/ft from 264 cid, and SH was something like 287 #/ft. from 164 cid. (My Book's at home, Hope I got those torque #'s right) Both considerably higher than their comparable green tractor competitors. Neb. only posted actual torque readings for a short time in the '52 to '53 period, A late A, or 60 didn't really make that much more torque than a Super H, and if it didn't rev.... How did it make horsepower? HP is a real simple calculation of torque X speed, were the Neb. test results incorrect? or didn't the old 2-cylinders like the Dyno?

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John T

08-20-2003 06:13:05

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 Re: Re: Re: Definition of Lugging Power in reply to Dr.EVIL, 08-19-2003 13:40:07  
Yeppers, HP is a function of Torque X RPM (some other engineerign figures inot that also) and you have to rememebr, the JD just has 2 cylinders and only one at a time puhing down and exertign force to twist the crank. However, if you have 4 or 6 cylinders, theres can be more rods exertign crank turning force, so that figures into the total torque. Good discussion thanks for the questions.

I graduated from Purdue BSEE back in 69, IU Law School JD in 1994, and my youngest (daughter) is starting in Architecture at Ball State.

God Bless, John T

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08-18-2003 18:40:03

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 Re: Re: Definition of Lugging Power in reply to John T, 08-18-2003 18:02:20  
John, For some reason I can't get your email address. I have another question you might be able to answer and would like to send you an email. Thanks again. Tye

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John T

08-18-2003 20:30:30

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 Re: Re: Re: Definition of Lugging Power in reply to Tye, 08-18-2003 18:40:03  
Tye, if jmn50@msn.com dont work try jmn50@bluemarble.net

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08-18-2003 16:53:39

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 Re: Definition of Lugging Power in reply to Tye, 08-18-2003 14:12:54  
When I was in high school, we had an old D that we pulled a 3 bottom plow with. Sometime I would get to a wet spot and that old D would really pull down. One time I just let it pull down and I could count the time between when the cylinders would fire. I don't think you could kill it. I finially shifted down to 2nd and plowed through the spot. It was a 3 speed and we did everything in 3rd.

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08-18-2003 15:06:12

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 Re: Definition of Lugging Power in reply to Tye, 08-18-2003 14:12:54  
Tye, lugging power is the ability of an engine [usually a long stroke, heavy flywheel, slow turning engine] to pull with usable power down to a very slow RPM. ~An engine without good lugging power [usually a short stroke high RPM engine] will only pull down with usable power to a fast idle then fade right out.
~When those old 2-cylinder Deere's are pulled down to a low RPM under a great load you can actually count the cylinder firings as the engine continues to run. [that's lugging power].
~Or put another way...lugging power is massive amounts of torque at low engine RPM's. ~An engine that lugs good usually lacks some high RPM power...

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08-18-2003 14:53:26

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 Re: Definition of Lugging Power in reply to Tye, 08-18-2003 14:12:54  
Basically all engines are rated for max power at a rpm higher than the rpm that max torque is developed and with a govenored engine the engine must start to pull down some amount to fully open the throttle as rpm drops to the speed that makes max torque. So in reality the engine has more "grunt" after it has pulled down some amount.

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08-18-2003 14:28:36

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 Re: Definition of Lugging Power in reply to Tye, 08-18-2003 14:12:54  
well all i have to say about that is when you think shes about to give up and go dead she just keeps on pulllliiiiinnnn!!! i have massey harris tractors and john deere when the massey harris wont pull it the john deere always will....the engines will not choke out as fast as a 4cylinder or 6cylinder engines period. and the little ford tractors dont even compete.

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