:fordn my 1986 F250 6.9l engine, I need to adjust the timing. can anybody tell me what those specifications are and what the best and affordable timing tool that would work for my application?:yesnod:
Dynamic timing (6.9) via luminosity is done where a probe is put into the cylinder, and actually sees the light from the explosion of the fuel, and the timing is set accordingly.
Pulse timing (7.3) is done where a sensor of a timing meter is installed on the #1 Fseries or #3 Eseries injection line at the injector end close to the injector. NOTE Different brands of pulse meters use different sensors and lines, but they use a normal timing light to profect timing onto the harmonic balancer after conversion.
Some of us set the timing by "ear". This comes from some experimentation and experience.
I like mine so that when the engine is cold, as the cold advance is on, the engine rattles pretty loud, but once the cold advance drops off, then the rattle smooths out and the engine is much more quiet. If you have it too advanced, then it makes that loud rattle all the time, often accompanied by lots of black smoke, and if too retarded, will sound kinda flat most of the time, lack power, and often not smoke at all, or may even smoke greyish/whitish(unburned fuel).
When you are standing at the front of the truck facing the engine, if you turn the pump counterclockwise(top of the pump to the passenger side) you'll be advancing the timing, and obviously clockwise will retard the timing.
Ziggster's info with some additions by me............Pete