Just back from the shed, and a hour plus playing.
I was playing with the Duel wheel, 12/2 setup. G1 and G2 connected together.
Had the timing light out and Yes my original thoughts where confirmed. Timing is moving around between starts. by about 30 deg. 360/12 = 30 so getting out of sync by a crank tooth just a thought.
We would have started the truck 40-50 times.
My original settings where
12 - crank speed
2 cam speed
0 trigger angle
crank - Leading
Cam - leading
When the engine was in the car it rand 95% good at that, When set to fixed 10 deg, timing light was at 10 deg.
When I started to play, timing was way out. set it back to 10 deg fixed. had to set the trigger angle at -28 deg to get it back. but jumped over the place on different starts.
Played with the cam trigger to falling. after I looked at my spare dizzy, as the shape of the cam wheel. but looking at the dizzy again and goggling the rotation. Leading is correct. will give the best clean transition. Will test this again tomorrow.
Also tried Sync every = Yes
Filter = Med
These helped and Speedie sometimes started rough, but came right. timing reflected this out by chunk, then back to 10. .
All look good for 10 starts, 10 deg on the money every time.
Then a few starts +ve a chunk, then a few -ve a chunk...... all over the place for some. Sometimes -ve a chunk...+ve a chunk....then back to good. these chunks looked like 30is deg, but with no markes that far out would be a guess
So tomorrow I will try, cam trigger leading. And give it 20 starts to see what happens.
Latter in the week I will modify my spare dizzy to be a 24-1 cam wheel. Has to be better. (Yea....Nar) as it will get rid off the two wheels and the sync between them.
Hope this is some use.
I will down load the Arduino IDE now and re compile the latest firmware for tomorrow