GS Ignition/Firing Order Diagram

[posplayr]

I was over at OSS and a question came up about using a 4 cylinder igniter on a 2 cylinder so i was prompted to map out the firing order / ignition sequence and how TDC/BDC and 1-4 coil and 2-3 coils firing relates to the igniter and it's pickup.

I worked it out based on a 4 cylinder firing order or 1-2-4-3 and a twin firing order where the cylinder are 180 out like a 1-2 pair.

First the timing for the 4 cylinder here. You will see the upper 4 traces represent cylinders 1-4 with TBC and BDC represented across the top. Compression strokes are represented by a thick RED arrow going up. Exhaust strokes are represented by a blue arrow going up.
Each spark pair has a common colored dashed circle.
Light blue is #1 , #4 both compression and lost spark


Orange is #2 #3 both compression and lost spark
IgnitionTiming_4Cyl.jpg






The coil that is firing that is shown on the 5th line down. The last line shows which igniter is firing the coils. The rear pickup is R and the front igniter is F (or left and right when you look at the ignition plate respectively).

Just block out the 3-4 cylinder and the 1-2 pair should be how a 180 degree in line 2 cylinder is.




P.S (EDITED ONCE ) if any of this is wrong let me know

[posplayr]

Here is the equivalent for the inline 2 cylinder (180 degree firing)

IgnitionTiming_2Cyl.jpg