What is a V-grooved type spark plug?

A It has a 90°V-groove in the tip of the center electrode to enhance ignitability.

FEATURE

  It has a 90°V-groove in the tip of the center electrode.

The V-groove ensures that the spark is directed to either left or right edge of the electrodes.

The flame core is generated near the perimeter of the electrodes and grows.

Ignitability is improved because the electrodes are interfering less when the flame core growing.