Design of a glow plug

Glow plugs are basically differentiated between metal rod glow plugs and ceramic glow plugs. A heating coil in the glow rod of a metal rod glow plug produces the necessary heat. Ceramic glow plugs, on the other hand, come without a metal glow tube. Instead, their heating element is encased in a special type of ceramic. Normally, ceramic glow plugs reach the necessary operating temperature very quickly. They are also more compact. These features are especially advantageous in modern engines