| Usually, the spark is discharged at the spark gap. However, when there is carbon fouling, the spark is discharged at the air gap and it burns off the carbon on the insulator surface, suppressing the decline in insulation. |
If enough carbon accumulates on the insulator, the voltage will track down the carbon path and sparking will occur at the supplementary spark gap. The spark discharge at the supplementary gap, burns away the carbon on the insulator to suppress a decline in insulation resistance that leads to carbon fouling. |
When there is carbon fouling, the spark discharge jumps between the surface of the insulator and the air gap. This spark discharge burns off the carbon on the insulator to suppress the decline of insulation resistance. |
The intermittent discharge plug, the spark plug with a supplementary gap, and the semi surface gap type.
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