Re: [FWDLK] lugging an engine

[Mike Apfelbeck <moparmike72@xxxxxxxxxxx>]

At 09:49 AM 2/21/2005, David Gedraitis wrote:
> While I'm aware that lugging an engine is bad and puts
> it under a load, I'm asking why this is bad?

Lugging the engine at low rpms puts the crank bearings under a lot of extra
load while at the same time the oil pump is turning slower, delivering less
oil to cool those bearings.

>  What does
> this do that ctually hurts the engine? Does it
> overheat?

The combustion chambers are putting out more heat, and at the same time the
water pump will be turning slower, minimizing its ability to circulate
coolant and cool the engine.

> Wear out the clutch faster?

Nope.

> I laboring for
> an engine isn't good, but I also know it does happen
> (think steep hills at high speed), so does anyone know
> anything more definite? I don't see why low vacuum
> would hurt, and while I know power isn't optimum,
> that's not technically harmful, either....

Theoretically, the brake specific horsepower rating (pounds of fuel per
horsepower per hour) would be more efficient under lower intake manifold
vacuum, but in practice the lower vacuum signal will open the power valve
in the carb, dumping more gas into the manifold.

Mike


> ~dave
>
>
>
> __________________________________
> Do you Yahoo!?
> Yahoo! Mail - 250MB free storage. Do more. Manage less.
> http://info.mail.yahoo.com/mail_250
>
> *************************************************************
>
> To unsubscribe or set your subscription options, please go to
> http://lists.psu.edu/cgi-bin/wa?SUBED1=l-forwardlook&A=1

*************************************************************

To unsubscribe or set your subscription options, please go to
http://lists.psu.edu/cgi-bin/wa?SUBED1=l-forwardlook&A=1