|
Hello, Tas,
I am greatly impressed by your access to information. I just checked the book I have handy (Pulkrabek). He didn't bring up the subject, although he states that EGR slows the rate of burn.
That means I probably got the information from a paper. My recollection is that the explanation for shortened delay was that transient species in the exhaust catalyzed ignition. Also, EGR raises gas temperature and that is expected to shorten ignition delay. I trust that your information is correct, and that will cause me to favor avoidance of EGR in favor of higher O2 partial pressure.
As for my car, I did not notice a change in fuel economy as I went from factory EGR to miniimum approved EGR and finally to removal of EGR. In any case, that makes me quite happy that EGR is seen to have little or no benefit for engine efficiency.
And, thanks for the rolling resistance table. It seems to match experience.
Ernie Rogers
|