Quote [Its my similar contention that if compression rises, it takes a higher voltage to arc jump current across the gap. Extreme high compression racing engines use HV coils that have the capacity to rise to higher firing voltages as necessary to fire the plugs. John T ]
John T ,I liked to do that "quenching" of the spark,on a multitude of spark plugs, both aero and auto, using the Champion Spark Plug tester and a large compressor.
Some plugs would quench at a relatively low pressure whilst others would still be sparking with the pressure way up.
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