Aluminium Oxide Ceramic Spark Plug

Selection of materials for both the electrodes and the insulator have consumed much research and development time and cost.

Aluminium oxide ceramic spark plug.

Generally the materials used are alumina compounds. Most spark plugs now use a 1 piece ceramic insulator made from purified alumina powder. They have no traditional association with the ninja or ninjutsu only being named. The electrodes in a spark plug typically consist of high nickel alloys while the insulator is generally made of aluminum oxide ceramic and the shell is made of steel wire.

This modern day insulator provides many benefits over previous designs including superior insulation or thermal conductivity. Though various materials have been used for spark plug insulators through the years the current contender is aluminum oxide. Ceramic materials are used as insulators in spark plugs the ceramic material is placed between the main electrode and the spark plug body. Ninja rocks are broken shards of spark plugs that are formed by smashing the ceramic portion of the spark plug with a hammer or other large object.