Ernie, the papers I've read mention increased EGR
increases the ignition delay. You might want to double check your textbook.
You might find the following paper interesting
KAIST Open Access Self-Archiving System: The influence of Charge Dilution and Injection Timing on Low-Temperature Diesel Combustion and Emissions (if you can download it, the connection seem unreliable, but I have a copy I'll post tonight)
here's the interesting information anyway:
The following was for a single cylinder optical engine very similar in design, and in this case operating parameters, to a what you'd find in a recent diesel car.
