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OK here goes. Firing order is 1,2,3,4,5,6.Now read CAREFULLY- standing in front of yourengine(Van) Visualize a clock laying on your distributor (12 noon put #1) (at 2oclock #2) (at 4oclock #6) (at 6oclock #4) (at 8oclock #5) (at 11oclock #3). Rotate3s clockwise Basic timing 12 degrees +- 2 degrees.Spark advance 38degrees +- 4 degrees
To simplify, let's take miles as the distance factor and times as at the top of the clock. In this case, you are plotting 1 mile on the y axis and 1:00 on the x axis (1,1,) ,(2,2) and (3,3) etc. The speed is obviously one mile per hour in this case.(1oclock,1)(2oclock,2).. Your final line on this graph will look like a 45 degree angle line, however you want your speed to increase. Since your speed is steadily increasing, you would plot (1oclock,1mile), (1:15,2mile), (1:25,3mile), (1:30,4mile) and the line would look steeper and closer to the y axis. Makes more sense to me to plot distance on the x axis and time on the y axis...but...