Car spark Plugs Explained


A car spark plug or k-plug, or a sparking plug is a device used for delivering an electric current from ignition system to a combustion chamber of any spark-ignition engine. It works by compressing air to mix with compressed fuel at the electric spark, where the combustion is under pressure in the engine.

A spark plug has an electrically isolated a metal threaded shell from central electrode through a porcelain insulator. This will always enable the car to have power needed when moving from place to another. Very heavy trucks often have central electrode that may contain resistors connected through wire that is heavily insulated right to the ignition coil terminal. The central electrode often works to the porcelain insulator to its combustion chamber to form spark gaps.

People use Spark plugs for other purposes such as direct Ignition when measuring ionization levels in the combustion cylinders. Many can also use it to replace ordinary knock sensor, misfire measurement and phase sensor function.

What are the parts of a plug that you should know?

Here are some of the parts of a plug that you should know:

  1. Terminal

Terminal is the spark plug top most part and contains a terminal that is connected to ignition system. This terminal construction often vary depending on what kind of spark plug you use. You can always choose from a wide range of options available in the market when buying.

  1. Insulator

Insulator is the main part of the engine made from a sintered alumina with very hard ceramic material of high dielectric strength. This will enable it to resist surface spark tracking. Its main function is always to offer an electrical insulation and mechanical support for its central electrode at the same time providing extended spark path for the flashover protection.

  1. Ribs

Ribs are the surfaces in between the grounded metal case and high voltage terminal of the spark plug. This physical shape often functions as way to improve electrical insulation at the same time preventing electrical energy that may leak alongside insulator surface from a terminal metal case. This makes it an important part in a car spark plug.

  1. Insulator tip

An insulator tip is the part of a combustion chamber made form aluminum oxide to enhance combustion. This part is always designed to withstand very high temperatures of 650 degrees C and 60 kV. They act as insulators to the car spark plug especially when it is moving at very high speeds. The insulator dimensions determines the metal conductor core and plug’s heat range.

. 5. Seals

Seals often prevent any loss of heat in the combustion chamber. It has to be kept tight to ensure that energy is conserved in the whole process.

  1. Metal case

The metal case of a spark plug can withstand the plug’s torque of tightening, at the same time serves by removing heat from insulator to pass it to the head of cylinder head, that sparks passes it on to the central and side electrodes.

  1. Central electrode

The central electrode is designed to reduce noise emission from the vehicle.