Quote:
Originally Posted by ksa8907
I was under the assumption that stoich is also peak combustion temperature.
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No, lean mixtures burn much hotter than stoichiometric. This can cause bad things under heavy loads, namely, holes in things. This is why at heavy load, and engine will alway go quite rich (~12:1) to keep things cool.
Lean is also awful for NOx emissions.
![](http://i1119.photobucket.com/albums/k634/mechman600/emissionsvsAFR_zpsc0061b5a.jpg)