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A lean running cylinder will be hotter than a rich cylinder but the key word is running.
Just a slight difference is A/F mixture and you have little or no combustion, just a bunch of cool air and even cooler fuel passing through an overly lean cylinder. Gasoline has a very limited flammability range.
"The flammability range of gasoline is between 1.4 and 7.6%. If the ratio of gasoline to air is less than 1.4%, then the mixture is to thin to burn. The mixture cannot burn when it contains more than 7.6% gasoline because it is too rich to burn."
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Clifton Brown
https://www.mancalamarketing.com
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