How Many Types of Spark Plugs Are There?

[LeJosephine]

Spark plugs mainly come in the following types: standard spark plugs, extended insulator spark plugs, electrode spark plugs, seat spark plugs, polarity spark plugs, and surface gap spark plugs. Spark plugs are installed on the side or top of the engine. In early designs, spark plugs were connected to the distributor via ignition cables. Over the past decade, most car engines have transitioned to direct connection between ignition coils and spark plugs. Spark plugs mainly come in the following types: standard spark plugs, extended insulator spark plugs, electrode spark plugs, seat spark plugs, polarity spark plugs, and surface gap spark plugs. Working principle of spark plugs: The ground electrode of a spark plug is connected to the metal shell, which is in turn connected to the engine block via threads on the cylinder head. The insulator primarily serves to isolate the metal shell from the center electrode. The terminal nut is the part of the spark plug that contacts the high-voltage coil. When current passes through the terminal nut and the center electrode, it ionizes the medium between the center electrode and the ground electrode, generating a spark that ignites the air-fuel mixture in the cylinder.