This type of spark plug is used under harsh conditions, such as continuous full-throttle acceleration, ultra high-rpm and high-speed operations.

Racing spark plugs must provide Sure Sparks, Good Ignitability and must support Rapid Acceleration whilst surviving the most extreme operating conditions.

Spark plugs that are used under harsh conditions use the following types of electrode materials and shapes.

1. Electrode material

Precious metals, such as platinum and iridium, are widely used.

2. Electrode shape

A small-diameter electrode is used to make sparking easier, improving ignitability.

3. Insulator shape for spark section

Special insulator shapes are available for improving acceleration response.