With the Alky system I tested the arc over voltage was around 28KV, and this dropped to around 12Kv during the burn phase.
This CDI system with double the capacitors and a really big coil ( a Crane as used in NASCAR ) had 4 times the burn duration of the stock
single CDI setup, it pulled around 5A from the DC supply where a single was all out at 1.5A.
I read somewhere that the limiting factor in a CDI is the capacitors ability to supply the required power fast enough, this being a quality set by the ESR
of the part, so I would imagine that the actual power supplied to the gap ie Watts = V*A is close to constant.
Thus when we have over twice the gap voltage at arc over, we would have less than 1/2 the current, and during the burn - visa versa.
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