I would love to know how one of our engines would run if you simply cut the end off the prechamber. So instead of lots of little holes, you would just have one big hole. Perhaps fuel would get to the piston and burn it up. Perhaps particle emissions would go up due to less turbulence, resulting in lower efficiency. Perhaps efficiency would go up because of less expansion losses through those tiny holes.

Anyone have an engine on the way out willing to run an experiment?

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1968 220D, w115, /8, OM615, Automatic transmission.
My 1987 300TD wagon was sold and my 2003 W210 E320 wagon was totaled (sheds tear).