In my job before retirement I worked with high voltage switch gear.
We had 4160 volt breakers that interrupted current in up to 5000 hp motors. As the breaker opened a piston in the switch gear blew a blast of air at the arc. The arc was extinguished and the switch gear wear was reduced.
IMHO the higher the density of the gas and air the easier to strike an arc as there are more molecules with loose electrons closer together. But as the engine is speeding up the turbulence in the engine cylinders is increasing at a high rate. To keep the arc from quenching from the turbulence more voltage is required.
also the spark plug gap has to be larger in high compression engines at high speeds to burn the gas at a much faster speed. This will increase voltage needed.
well if everyone agreed there would be no real discussions.
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