RC12YC Spark Plug

Spark plugs are used to ignite fuel in gasoline/petrol internal combustion (IC) engines; spark plugs are not required in diesel engines. Internal combustion engines can be split into two ignition categories, these are 'spark ignition' (gasoline/petrol engines) and 'compression ignition' (diesel engines).

Spark plugs are installed in both two stroke and four stroke engines.

The main components of a spark plug include:

Terminal Connection - where electrical current is supplied to the spark plug.

Centre Electrode - a straight conductor passing through the centre of the spark plug.

Ground Electrode - a curved shaped conductor that connects the spark plug to ground.

Resistor - used to reduce electrical noise.

Electrode Gap (spark gap) - the space between the ground and central electrode; this is where the spark (electrical arc) occurs.

Not all spark plugs contain a resistor, but almost all automobile spark plugs do. The resistor reduces the amount of electrical noise created by the spark plug. Electrical noise is also referred to as electromagnetic interference (EMI) or radio frequency interference (RFI). Because the spark plug is effectively a conductor, it creates its own magnetic field and so does the electrical arc created by the spark plug. These electromagnetic fields can interrupt other nearby electronic circuits and cause adverse effects. In order to reduce the likelihood of EMI on items such as the engine control unit (ECU), car radio and other electronic circuits, a resistor is installed.

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