Charlie, your 180 off on the name.

I can see how vibrations and harmonics can cause damage.
That is through shock loading.

I am not 180 off on low rpm load causing bearing damage.
If you squeeze the oil film out between the crank journal and bearing, you
get wear.  Low rpm and high loading will cause this to happen.

> Mark you are 180 degrees off, lugging is caused by not enuf low
> end power -- in other words the if the motor  doesn't have the
> juice to push through (ie not enuf torque) it struggles to spin
> when it cannot -- thus sputtering and pushing in spasms and jerks
> -- that is what is called lugging.  If the motor has sufficient
> power on the low end to handle the situation, it just moves
> smoothly as it is supposed to.  it is the vibration and slamming
> against the bearings and saddles due to not enuf power that
> causes damage when lugging.  Charlie.
>
>
> >>>Robert, if the engine is making more power at lower rpm's,
> than there is
> more load on the motor.
>
> An extreme case of low rpm power would be lugging, the worse thing you can
> do to a motor.
>
>
> > Mark,
> > It should not increase bearing wear any more than normal but can
> > help because
> > the engine can make the power easier at lower RPMs, and you
> > extra power
> > to simply get you to your normal driving a little sooner, then
> > the chip will
> > help the engine last longer.
> >
> >
> > Adding the counterweights at rebuild time, makes the engine last
> > longer and
> > run smoother and increases the bearing life beyond the 150,000
> to 300,000.
> >
> >
> > Robert
> >
>
> ------
>