(06-05-2014, 11:17 AM)Simpler=Better Well, the burn tube can be opened up as well so that part is done on a lathe.
I would not do that as I for see the thinner tube walls cracking and the burn tube breaking off.
The hole diameter in the injector seat however can be increased (where the injector nozzle sprays fuel). MB put out a bulletin a long time ago, one of the things that they recommended to do to reduce smoke was to increase the injector end hole diameter. They also said to lower the seat injector seat in the PC, but I forget the exact dimension, I got a little too frisky and cut my first ones too deep and the PC separated when I torque the injector.
The next time I do a PC, I am going to machine a slot across the three burn holes making a mouth so to speak.