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
> 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 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!