View Single Post
Old 11-28-2015, 03:42 AM   #20 (permalink)
ConnClark
DieselMiser
 
ConnClark's Avatar
 
Join Date: Jun 2008
Location: Richland,WA
Posts: 985

Das Schlepper Frog - '85 Mercedes Benz 300SD
90 day: 23.23 mpg (US)

Gentoo320 - '04 Mercedes C320 4Matic
90 day: 22.44 mpg (US)
Thanks: 46
Thanked 232 Times in 160 Posts
Quote:
Originally Posted by freebeard View Post
It seems you've always been right before, but do you have a citation or a theory of operation to account for that?
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.
__________________
  Reply With Quote
The Following User Says Thank You to ConnClark For This Useful Post:
freebeard (11-28-2015)