Scott Gardner wrote:
SG>> Subject: Carbs, why is lean hot?
SG>>
SG>> While on the topic of carbs, I always wondered why a lean mixture makes an
SG>> engine run hot. Anybody out there have a good theory? Could it have anythi
SG>> to do with the evaporation of unburned gas? A friend of mine says air cool
SG>> engines are run extra rich to help keep them cool, fact or fiction?
SG>>
SG>> Bob Donahue, Still Stuck in the '50s
SG>>
SG>Bill,
SG> Just going to throw my W.A.G in here, but could it be that extra air
SG>in the mixture leads to more complete combustion, thus drawing more
SG>heat energy from the fuel? This might also explain why emissions
SG>will usually drop with a leaner mixture.
SG> Again, just a guess. I'd love to know more, as well.
SG>Scott
Unburned hydrocarbons can absorb, and thus remove more heat from the
combustion chamber than unused oxygen.
John Kahoon
71 midget
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