alaskanassassin

Can anyone tell me how you lug a motor and what are some of the side effects of lugging a motor? Thanks a lot.

Dr. Evil

standard transmission?

Im no truck driver, but it usually means being in too tall of a gear for the RPM range you are operating in. This is especially hard on the standard transmission (especially when towing) and has caused a fair number of fifth gear nuts to bite the dust. Its better to rev it than to lug it.

BoostdCTD

Side effects are heavy internal motor wear. Especially on the, um, crankshaft bearings?

I think the rule of thumb is not to be putting a load on the NV4500 at a rpm below 1600, otherwise the slight lugging will loosen the 5th gear nut.

msing

As I understand it lugging is when rpms will not incresse if more throttle is given, up untill governed rpm. so if going up a hill, foot going down, and rpms staying or going down you are then lugging the engine. see it alot of the time with farm tractors with to big of a load and no power shift.

Hemi Cat

under 1400 rpm and WOT or full fuel would be considered lugging. The rod bearings will start to fatigue and the crankshaft will start producing harmonic vibrations and send them thru the trans causing problems. Hope this helps

pappyman

Lugging is when you can not gain or maintain RPM's ( loses speed ).....happens mostly with diesels when climbing a hill or on a upgrade

P.J

Msing is right, it's seen alot in Farm Tractors. They ususally warn against it in operators manuals, as it can cause damage to "unbroken in" diesel powered tractors.

BoostdCTD

Pappy, with that defenition then you'd be classifying lugging as anytime you hit a hill. Whether you were going 80 with no load or 45 up a mountain in a lesser gear.

alaskanassassin

Thanks for all the input. I just want to keep my 94 automatic around as long as I can. I installed a #6 plate, what does this do to the durability of this motor? Thanks

infidel

"As I understand it lugging is when rpms will not increase if more throttle is given" is the way I always learned it.
It only happens at every hill if you don't downshift when it's time.

pappyman

Thats it anytime you can't maintain RPM's or speed your lugging the motor.....this is why so many big rigs need to downshift on upgrades (hills)

With a auto tranny they will downshift at a set RPM to prevent lugging......I have needed to lockup my torque converter many times to help climb hills from a stop with a loaded trailer.....I have one hill just before my house that I will be at 25 MPH when I top the hill with a running start of 60 MPH