Dave,
As I understand it, part of the issue is timing. The other part is to atomize the fuel. In that, if you advance timing then you can burn fuel that isn't "broken up" as well. But if you retard timing, you have to really atomize the fuel for complete burn.
The example being HPCR systems. The closer to TDC you SOI, the higher the rail pressure and vise versa. In a HEUI, the ICP and intensifier piston accomplishes what rail pressure does in those systems. Controls injection pressure at the nozzle.
All that being said, I would think that a lower ICP and a little advance in SOI would make less smoke without the "lean burn" feel. With a bump in PW to keep the fuel delivery the same.
But I might be way off base???
Roger
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