You will find yourself hard pressed to find an ignition system now that is not CDI, commercially or race circuit, escpecially with waste spark systems in any vehicle from 96 and on. My question is not for the use of CDI, but for the use of a capacitor bank to be used in conjunction with the standard ignition of an older vehicle, ie 1991. Although HEI has advantages, I want to extend the spark/arc duration and increase it's power(J) across the plug, in short create a plasma arc. It can be done with 110V pulsed DC started with the high voltage spike from a distributor. What I want to do is have a predetermined value of energy @ 220V stored in a capacitor and then released across with the gap with ionized field from the high voltage spike. During the time of the HV spike I want to diconnect the charging circuit from the cap, since my last post a friend came up with a simple but effective circuit using a couple ideas of mine. Similar to a timing light, using an inductive pick-up coil, although toroid instead, with that signal sent to a transistor to shut off another power transistor that allows charging to the cap. Although doing it this way will create a fast, large, and loud discharge at the plug I would like to extend the discharge time if I can that will be closer to that of a plasma arc in the plasma cutters and still be variable in timing with the engine. Basically NOT computer controlled with all sorts of sensors to allow it to work. Charging time may be an issue but cap sizing and choice should reduce that considerably to where it will not be an issue.