Post by
Q45tech »
https://forums.nicoclub.com/q45tech-u112.html
Fri Feb 17, 2006 7:10 am
EGR is very important to achieveing highway MPG, it is reponsible for at least 2 mpg on highway and the ability of engine to not knock in summer heat.
"diluting the mixture lowers combustion temperatures because you>have to heat up some unreactive gases. That's the main idea of EGR,>because lower temperatures decrease emissions of NOX.>>It also reduces heat transfer, because convective heat transfer>is proportional to the difference in temperature (between gas>and walls), and radiative heat transfer is proportional to the>difference of the FOURTH POWER of the temperatures. Less heat>lost to the walls means a greater percentage of the heat is>going into increased gas pressure, therefore increased work."
http://cars.rasoenterprises.co...s.htm