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Re: Lean = hot?

To: Scott Gardner <>
Subject: Re: Lean = hot?
From: "Christopher M. Delling" <>
Date: Wed, 25 Jun 1997 07:31:03 -0400
Scott Gardner wrote:
> > Subject: Carbs, why is lean hot?
> >
> > While on the topic of carbs, I always wondered why a lean mixture makes an
> > engine run hot. Anybody out there have a good theory? Could it have anything
> > to do with the evaporation of unburned gas? A friend of mine says air cooled
> > engines are run extra rich to help keep them cool, fact or fiction?
> >
> > Bob Donahue, Still Stuck in the '50s
> >
> Bill,
>         Just going to throw my W.A.G in here, but could it be that extra air
> in the mixture leads to more complete combustion, thus drawing more
> heat energy from the fuel?  This might also explain why emissions
> will usually drop with a leaner mixture.
>         Again, just a guess.  I'd love to know more, as well.
> Scott
> Scott Gardner

Here is an easy way to think about it.  Turn on an acetelyne tank and
light the torch.  Lazy yellow-orange flame and not much heat.  Turn on
the oxygen tank and what happens?  Same thing happens in an engine!


Chris Delling

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