Quote:
Originally Posted by freebeard
It seems you've always been right before, but do you have a citation or a theory of operation to account for that?
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When combustion gasses get hotter or remain hotter for longer you generate more NOx. The big push for aluminum heads on cars wasn't driven by saving weight. It was driven by emissions requirements. Aluminum heads conduct more heat away from the combustion chamber because aluminum is a better heat conductor than cast iron.