Nickel Spark Plug B-4L 3112

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Terminal
The connection terminal is usually an SAE 'barrel'shaped connection, a 4 mm thread or a cup design. The hightension ignition lead or aa pencil coil is plugged onto the terminal. This connection allows thehigh voltage to be transferred to the firing end of the spark plug.

Ceramic insulator
Most spark plugs used today feature a single-ceramic insulator made from auminium oxide, with other types of ceramic materials like porcelain used ie past. This provides many benefits, including thermal conductivity and superior insulation. Resistance to overheating, thermal and mechanical shoare other stand-out features. It also helps to prevent overheating and proles exceptional resistance against mechanical and thermal shock.

Resistor
In order to ensure electromagnetic compatibility (EMC) and thus the fault-ee operation of the onboard electronics, a ceramic resistor is used insidepark plug as an interference suppression device. It is constructed by a fusion of carbon and glass compounds which form a solid component within tthe spark plug. It also prevents interference with electronic components tare not located on the vehicle e.g. domestic TV and radios.

Centre electrode
The centre electrode can be made from nickel, copper, chromium arnd precious metals such as iridium and platinum.
It is connected to the terminal by an internal copper wire, which carries electrical voltage through the spark plug to the tip of the centre electrohere it then jumps the small gap to the ground (side) electrode,creating a spark.

Ground (Side) electrode
Once the spark jumps the gap from the centre electrode to the ground electrode, a spark is created which ignites the fuel in the combusstion chamber.The ground electrode can come in a variety of shapes and sizes. Some (multground spark plugs) can even feature two, three and four ground electrodesThese, however, do not create more sparks than a spark plug with one ground electrode.

Gasket
The gasket ring prevents any possibility of combustion gas leaking ppast the spark plug due to the extremely high combustion pressuresIn doing this, it prevents any cylinder pressure losses.

Metal Shell
This is the steel shell which a socket wrench fits around in order to loosand tighten a spark plug. A plug's hex head can come in a variety of sizesich include 13mm, 14mm, 16mm, 18mm, 19mm, 21mm, 22mm, 24mm, 25mm and Bi-Hex 14.0mm.

Ribs or Corrugation or Leakage Barriers
Located above the terminal, the ribs help to protect against spark filashover.

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