[V8] Re: cold weather killing gas mileage (AHA!!!)

[Coleman, David]

IIRC, the V8's thermostat cannot be installed backward.  Though I was 5 or 6 beers deep, so that's a big If..

-DC-



> -----Original Message-----
> From: v8-bounces+david.coleman=blackrock.com at audifans.com 
> [mailto:v8-bounces+david.coleman=blackrock.com at audifans.com] 
> On Behalf Of Ingo Rautenberg
> Sent: Monday, May 02, 2005 11:04 AM
> To: v8 at audifans.com
> Subject: Re: [V8] Re: cold weather killing gas mileage (AHA!!!)
> 
> Well, I'm pretty sure I did.  I know the ball-relief valve is 
> at the top.  I did install it the same way as the old one and 
> wasn't sure that it could be reversed, but will check when I 
> inspect again.  Hmmm....
> 
> ----- Original Message -----
> From: <dsaad at icehouse.net>
> To: <v8 at audifans.com>
> Sent: Monday, May 02, 2005 10:21 AM
> Subject: Re: [V8] Re: cold weather killing gas mileage (AHA!!!)
> 
> 
> > I does not take much of a leak around the thermostat to really kill
> mileage in
> > sub-freezing weather. If you think about it a little, the 
> cooling system
> in
> > effect is trying to keep the radiator at 97C (its a side 
> effect of keeping
> the
> > motor at 97C). It can't of course so if you have a slow or 
> sticky t-stat,
> it
> > will shut untill the motor heats up - then it opens too 
> much - letting in
> a
> > deluge of really cold water. The thermal shock alone is not 
> good, and the
> ECU
> > will dutifully notice the operating temp is too cold and 
> put you back in
> cold
> > enrichment mode. If you can see the needle swing back and 
> forth then you
> have
> > something like this going on.
> >
> > This is one reason there is a tiny bypass hole in the 
> thermostat. It will
> allow
> > some cold water to pass - hopefully keeping the t-stat more 
> closed when it
> is
> > cold, and prevent the wild swing.
> >
> > That brings up a point - did your new t-stat have the 
> by-pass valve? (the
> little
> > steel ball in a cage) and is it installed properly? You can 
> often install
> the
> > t-stat backwards if you are not careful.
> >
> > Dave
> >
> >
> > Quoting Ingo Rautenberg <i.rautenberg at waratap.com>:
> >
> > > You guys have me thinking.  This morning I watched my 
> temp gauge and at
> 42°F
> > > it took (mixed city/hwy) over 20 minutes to get to 
> operating temp.  Over
> > > twice as long as I would think.  And thermostat  was 
> replaced less than
> 20k
> > > ago...
> > >
> > > Ingo
> > >
> > >
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