Hi Roger !
Do you have a means to balance the injection timing accross all 4 cylinders?
That's a question that I really...can't answer
With the single cylinder engine I did, I know the injection time - exactly the lobe starts to contact the plunger - is between 22 and 45 degrees before TDC ( 22 is from 19 to 22 . 45 is from 45 to 47 and I would say 22 to 45 and that would be the correct number)
Balancing the injection time for 4 cylinders seems impossible to me - at the moment. Because it depends on the spring force of the needle and the pressure in each cylinder
With the force of the spring of each needle: I will try to adjust to be able to vaporize as much oil as possible
With the pressure in each cylinder , it depends too many factors such as cylinder , ring , piston ....
With this engine, I will choose the injection time to be 25 degrees before TDC and when the engine runs (hopefully it will run) I will adjust more
It's so small and I can't control everything, all engines I've done I'm pretty confident it will run , but with this diesel engine : will it run? And how does it run? I'm not sure