|
If my college chemistry from close to 10 years ago is accurate, running leaner allows a higher o2 to fuel ratio, resulting in a hotter flame, regardless of heat transferrence.
This is part of the reason for hot rod diesels done by the DIY crowd tend to smoke a lot. Adding fuel to be burnt will absorb excess heat and lower EGTs, which is a good thing when you're running higher than spec PSI (I've heard of blokes shoving 60 psi into a 3.9 L Cummins 4 cyl. Talk about severe duty!)
Before fuel can be combusted, it must be brought up in temperature, so adding more fuel will cool the combustion cycle. More fuel to be warmed=more smoke, but cooler temps. As an example, think of why a nitrous system works. NO2 is injected into the intake, but in the higher versions, additional fuel is also injected to control the intake temps. Another example is the theory behind the EGR system, which injects a low O2 gas into the combustion process to lower EGTs. Anyone knowing anything about NOS injection knows too much will burn up the motor without injecting additional fuel.
__________________
 RIP Maxima 1997-2012
Quote:
Originally Posted by jamesqf
I think you missed the point I was trying to make, which is that it's not rational to do either speed or fuel economy mods for economic reasons. You do it as a form of recreation, for the fun and for the challenge.
|
|