Peter Zaborski wrote:
>
> > From: Andrew Mace [SMTP:amace@unix2.nysed.gov]
> > Sent: Monday, April 20, 1998 1:57 PM
> >
> > Are you still running with the original mechanical fuel pump?
> Yes. (And I already have the spin on adapter - leak-free so far). It is
> just that I seem to drive my car on weekends only and so usually go a
> few days between running the engine.
>
> > If so, I wonder if, over time, the benefits of pre-built-up oil
> > pressure might be
> > negated (or worse) by the amount of unburnt fuel that would go into
> > the
> > cylinders while you're building oil pressure.
> I never considered that. Does this really happen or do the carbs and/or
> fuel pump valves prevent an overflow of unburned fuel from reaching the
> cylinders if the engine is nor running? I assumed excess fuel is not
> going to be a problem but perhaps I am wrong and the fuel does just keep
> flowing as you crank the engine?
>
> Thanks for the good points. I wonder what others might say on this.
Here's what one other says on the point. I fully agree with Andy.
Obvoiusly most auto manufacturers didn't think that oiling upon initial
startup was a problem or else there would be many alternative fixes
available. Getting too much fuel can (and often does) cause a situation
known as "washing down the rings" which causes the rings to lose their
seal against glazed cylinder walls and start losing compression and
burning oil. What happens is that the excess fuel washes off the oil
coating deposited by the oil ring. Once this coating is gone, the
cylinder will lose its hone marks that retain the oil coating and lead
to early ring/cylinder wear.
--
"If you can't excel with talent, triumph with effort."
-- Dave Weinbaum in National Enquirer
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