josha37 (From PM) "So with pre chamber modification why not just remove? make it direct injection just like all newer diesels and save the headache? Might be a dumb question but sounds plausible."

I've cut the ends off of some Prechambers to see how close to direct injection I could get, but I am very concerned that the concentrated heat exiting the burn tube directly onto the piston would burn a hole in the piston is short order, so I have not tried them. I don’t think the boundary layer will be sufficient to protect the piston. I gave them to a friend that has been helping me in this effort to try, he volunteered his tired 616 for the cause.

The concept is more what I am looking to achieve, an external combustion chamber. I like the slot because it allows more flow than stock, still presents some restriction with the additional combustion gasses, and fans the heat over the top of the piston instead of directly onto a concentrated spot.

Small steps.