No subject

up heat much more readily/quickly than oil.  Yes?

Jim Accordino

--- Larry C Leung <l.leung at juno.com> wrote:
> Although Bernard's answer is correct, I figured I'd
> answer James'
> question,
> from a chemistry standpoint. Specific Heat is the
> measure of how much
> temperature
> rise that a given quantity of a substance will
> experience for a given
> amount of added
> (heat) energy. Water is one of the highest specific
> heat substances,
> period. Oil comparatively
> is not. So, admittedly without looking up specific
> (ha, ha) numbers, I
> can say with complete
> confidence that water cools better than oil. This of
> course is a
> materials standpoint only,
> and has nothing specifically to do with the nature
> of Audi cooling
> systems and oil squirters.
>
> BTW, aluminum has a fairly low specific heat, which
> is why you can grab
> the aluminum foil
> right out of a 400 degree F oven without burning
> yourself. Your water
> based body at 98 degrees
> F has enough specific heat compared to the aluminum
> to force the
> aluminum's temperature
> to cool to your higher specific heat body. This
> property works well for
> cylinder heads IF and only
> IF the cooling system is capably designed with
> enough circulation of
> coolant to have water help
> keep the head temps even. Then the aluminum will
> mimic the water. If the
> cooling system does
> not have even circulation, the aluminum will end up
> mimicking the
> cylinder temps and thus
> cause hot spots and thus, detonation.
>
> LL - NY
>
>
>
> > Date: Thu, 8 Aug 2002 15:16:07 -0700 (PDT)
> > From: james accordino <ssgacc at yahoo.com>
> > Subject: RE: more BOOOOST!
> > To: JShadzi at aol.com
> > Cc: audi list <quattro at audifans.com>
> >
> > Maybe the piston temps. bear much more on the oil
> than
> > the water?  They are oil cooled, yes?  Maybe the
> water
> > has a much larger heat soak capability?  And
> better
> > cooling of the water?  Via good airflow through
> the
> > radiator and an efficient fan?  I don't know, I'm
> just
> > guessing.
> >
> > Jim Accordino
> >
> > --- JShadzi at aol.com wrote:
> > > If this is the case, how come its not reflecting
> at
> > > all in the water temps?
> > >
> > > Javad
> > >
> > > >Ding. =A0I think we have a winner. =A0I saw a
> NASTYCAR
> > > >piston once. =A0Running like 14/1 compression
> and
> > > went
> > > >full lean as he ran out of gas at part
> throttle.
> > > >Looked like they used a cutting torch. =A0It
> burned a
> > > >hole clean through the dome. =A0Melted right
> through
> > > it.
> > > > EGT's can really soar under part throttle/lean
> > > >conditions. =A0Totally off throttle is still
> hot but
> > > not
> > > >nearly so.
> > > >
> > > >Jim Accordino
> > > >
> > > >--- TM <t44tq at mindspring.com> wrote:
> > > >> Marc-
> > > >> Sounds to me like your car is running too
> lean at
> > > >> part throttle and your
> > > >> EGTs are soaring, hence the high oil temps.
> > > >>
> > > >> At WOT, you're going full rich and the fuel
> is
> > > >> cooling things down.
> > > >>
> > > >> Taka


__________________________________________________
Do You Yahoo!?
HotJobs - Search Thousands of New Jobs
http://www.hotjobs.com