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Spark Plugs - Components: The spark plug consists of various metals, ceramic and glass. Shell Made from metal, it includes a hexagon shape at one point to allow tightening with a socket and a threaded area at the electrode end for securing it to the cylinder head. Terminal [1] Made from metal it is at the opposite end to the electrodes. Insulator [2] Houses the centre electrode and terminal and insulates them from the shell. Made of a highly purified alumina powder, which gives exceptional dielectric strength and thermal conductivity at high temperatures, as well as greater physical strength. Centre Seal (e.g. Copper-Glass) [3] Mixture of powder that bonds the centre electrode and insulator together for a gas-tight seal. Proper heat is maintained and hot combustion gases are excluded. Centre Electrode [4] In standard plugs it is melted gas-tight into the insulator. It protrudes slightly from the insulator creating a specific size gap with the ground electrode. The diameter is important and determines certain characteristics. Ground Electrode [5] In standard plugs it reaches out from the threaded end of the plug and curves over to create a specific gap size with the centre electrode. :: Recommended Reading / Videos :: :: Recommended material containing aditional info about Spark Plugs - Components ::

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