tim_blair wrote:what is the reason you think that it will damage my ignitor/ coil?
is it bacause of the low primary resistance?
if so could i put a resistor in series before the coil to reduce the current draw?
can you please explain what you mean by a coil that will work with an inductive system?
Huge difference between CDI and IDI.
Putting resistor is counter productive, since the coil will not reach the energy levels without capacitor discharge driving it, and just heat up without making an useful spark.
CDI works by having a capactor that is charged to few hundred (400-600) volts rapidly discharging through coil, which causes a high voltage spike on the secondary. The CDI coil has lower primary to secondary turn ratio, smaller core as well as less turns, since it works on short high voltage pulses.
IDI works by directly driving the coil at ~14V and interrupting the current supply thus rapidly collapsing the field, which induces the high voltage in secondary. The IDI coil has greater primary to secondary turn ratio (since it is being driven by lower voltage) as well as higher number of turns in the primary and chunkier core.
In CDI the energy stored in capacitors while in IDI the energy is stored in coil itself.