Lugging?
- Thread starter Westbilly
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BobinCols
Silver Member
Since the Olympics are over I guess you don't meen lugeing!
Lugging an engine to me means doing work with your tractor at too low a rpm in too high a gear.
Lugging an engine to me means doing work with your tractor at too low a rpm in too high a gear.
Anonymous Poster
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Every engine has an operating range of RPMs lugging to me would be using the motor just at or below the working RPM , like going from second to third gear in your car before you get enough speed up, theres not much power there. /w3tcompact/icons/smile.gif
Thomas
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Lugging kinda like when useing an old farm tractor and your end the lowest gear,w/the throttle 1/2 way or better and hauling or pushing,and she really working but you have your foot ready for the clutch just in case.
One needs to know the point of the low end of lugging on the engine so you won't stall the engine.
One needs to know the point of the low end of lugging on the engine so you won't stall the engine.
Bird
Rest in Peace
<font color=blue>What exactly is lugging?</font color=blue>
Low RPM and high load.
Low RPM and high load.
Egon
Epic Contributor
Westbilly:
Many different connotations can be applied to the word "lugging"
For me it means a 50 # pack on my back, long skinny boards on my feet, sweat running down into my eyes and 40% snowy hill to climb up. Why there is a grin on face when subjecting my body to such torture is beyond me.
Egon
Many different connotations can be applied to the word "lugging"
For me it means a 50 # pack on my back, long skinny boards on my feet, sweat running down into my eyes and 40% snowy hill to climb up. Why there is a grin on face when subjecting my body to such torture is beyond me.
Egon
Bird
Rest in Peace
That's about it, Westbilly. I found a definition that might be better at <A target="_blank" HREF=http://dodgeram.org/tech/dsl/FAQ/engine_op.htm> this site</A> talking specifically about the Dodge Cummins engine, but I think it applies to others as well:
<font color=blue>Engine "lugging" is defined as operating under a load great enough that engine speed can not increase at wide open throttle (assuming that the governor is not cutting the throttle).</font color=blue>
<font color=blue>Engine "lugging" is defined as operating under a load great enough that engine speed can not increase at wide open throttle (assuming that the governor is not cutting the throttle).</font color=blue>
Pks
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Years ago, in my automobile engine repair class, the professor talked about a type of lugging that is actually quite hard on an engine.
The harm occurs when the engine is not running fast enough for the load for a time period of several seconds to minutes to hours. The worst is when this rough running is allowed to continue for hours.
During this time frame, the engine is continually on the verge of stalling but just barely manages to hang on (continue to run). Usually, at this point, the engine runs in a rough manner. Sometimes there is an audible sound that, for a gas engine, sounds like heavy knocking or dieseling. You may have heard it while trying to teach someone to drive your gasoline powered car with manual transmission.
The actual harm is felt in the bearings and crank journals. The crankshaft, instead of floating inside the bearings actually begins to smack into the faces of the soft bearing material.
If this goes on long enough (who knows how long it takes?) the bearings will loose their shape, size tolerance and the crank will not spin smoothly at any RPM.
Does this help?
Peter S.
The harm occurs when the engine is not running fast enough for the load for a time period of several seconds to minutes to hours. The worst is when this rough running is allowed to continue for hours.
During this time frame, the engine is continually on the verge of stalling but just barely manages to hang on (continue to run). Usually, at this point, the engine runs in a rough manner. Sometimes there is an audible sound that, for a gas engine, sounds like heavy knocking or dieseling. You may have heard it while trying to teach someone to drive your gasoline powered car with manual transmission.
The actual harm is felt in the bearings and crank journals. The crankshaft, instead of floating inside the bearings actually begins to smack into the faces of the soft bearing material.
If this goes on long enough (who knows how long it takes?) the bearings will loose their shape, size tolerance and the crank will not spin smoothly at any RPM.
Does this help?
Peter S.
TresCrows
Elite Member
Yes, too high a load at to low a RPM forces the engine to operate outside of it's design/force envelope. In addition to "knocking" and predetonation or early detonation, the higher than normal cylinder/combustion pressures raise the EGT/CHT and also hammer the heck out of the bearings/pistons. In extreme cases the oil/lubricant can be squeezed out from between the working parts and metal to metal contact can occur. This is not good as galling-- metal transfer, and overheating of surfaces will result. Aviation engines that are operated in this manner will self destruct or come to an untimely end, diesel tractor engines are perhaps more tolerent as they are designed to operate under high loads at relatively low RPMs and are heavily built and diesels are tolerent I suppose of detonation. I think the definition of detonation is a sudden and untimely, uncontrolled/rapid burning as in an explosion as compared to controlled combustion expansion at the proper ignition point with a spreading flame front providing a relatively even push, not a hammer like blow.
Diesels are strange beasts anyway, give me a turbine anyday. An Allison 250 could really make some dirt fly and you can hold it in your arms. I was once told that you could hold the prop on a PT6 Pratt during start, (turbines are low torque and high RPM reduced via a gearbox of various sorts to produce the needed torque--the PT6 power turbine and compressor turbine are a shaft in a shaft and are not connected so to speak), frankly, I would not want to try that as once that baby spools up to 30,000 plus RPM between 600 to 1200 horses are effortlessly unleashed. Plowing at 100 MPH is completely possible! Along the same lines, I was once hitching a ride via a commuter airline back to work and was listening in on a 30 something and his girlfriend as he described in typical male know it all fashion how he did not trust these prop jobs because they were "half motor and half jet", she seemed unimpressed but whether by him or the prop jet engine I can only guess.
J
Diesels are strange beasts anyway, give me a turbine anyday. An Allison 250 could really make some dirt fly and you can hold it in your arms. I was once told that you could hold the prop on a PT6 Pratt during start, (turbines are low torque and high RPM reduced via a gearbox of various sorts to produce the needed torque--the PT6 power turbine and compressor turbine are a shaft in a shaft and are not connected so to speak), frankly, I would not want to try that as once that baby spools up to 30,000 plus RPM between 600 to 1200 horses are effortlessly unleashed. Plowing at 100 MPH is completely possible! Along the same lines, I was once hitching a ride via a commuter airline back to work and was listening in on a 30 something and his girlfriend as he described in typical male know it all fashion how he did not trust these prop jobs because they were "half motor and half jet", she seemed unimpressed but whether by him or the prop jet engine I can only guess.
J