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Old 01-25-2015, 09:01 AM   #10 (permalink)
ksa8907
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Quote:
Originally Posted by Baltothewolf View Post
You can melt your heads running to lean, btw. From my limited understanding, the heat difference isn't linear and goes up exponentially the more lean you go.
I don't recall which thread had the info, but the only reason running lean raises temps is because it burns slower adding time in which heat will transfer to the heads/pistons/valves, etc, but lean combustion has a colder peak temperature than stoich, 14.7:1. "rich" combustion also has a colder than stoich peak temperature, the extra fuel also helps cool the engine. Part of the reason you get soot from running rich is because the combustion is too cold to burn it off.
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