pete 23 said: (quoted from post at 14:21:29 01/10/10) It may help but not likely. The 1206 used a smaller total degree of automatic advance at full throttle due to the turbo. So it depends on what your pump advance total is to make a determination as to where to put the static timing. Also the 856 used more advance than an 806 and when a lot of pumps are rebuilt they are rebuilt or replaced with 856 pumps so when put on an 806 you retard injection to that 6 degree setting to compensate for this. I guess what I am saying is , if it doesn't make it start any better by going to 8 degree static timing I would put it back to 6 for better full load performance. I don't have my service manual handy right now or I could look up the actual specs.
Adding to what Pete 23 has said, the end of injection timing is more important than the start of injection. Combustion needs to be complete by about 10° after TDC. The timing marks in the pump mark the beginning of injection.
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