Originally Posted by alfanut2day
I have discovered that all four spark plugs are firing at the same time
The Cylinders run in pairs 1 / 3 and 2 / 4.
This configuration is for wasted spark - meaning that at when Cyl 1 fire for ignition, Cyl 3 fire exhaust stroke to make sure all gasses are burnt - it help with emissions.
This configuration is pure twinspark in the sense that both sparkplugs fire simultaneously in one cylinder - bigger bang
I need confirmation on this: AFAIK the ECU fires at both compression and exhaust strokes - in both cases you get twinspark at both strokes - best of both worlds
The benefit with the longer leads are that if one coil pack packs up you still get spark from the other coil pack you only loose the twinspark in 2 cylinders