The larger gap, the more voltage is needed to jump the gap. Usually it takes about 3000v for the arc to jump through 1mm of air. If the air gap is 2mm, then about 6000V are needed. Of course even more voltage is needed to jump across 1mm at higher pressures like in the combustion chamber. But if your gap is about 1mm, then 15kV worth of diodes should be enough
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