The main difference between ceramic and metal glow plugs is in the materials used to construct them. Ceramic glow plugs are made of a ceramic material that is designed to withstand high temperatures and is very durable. On the other hand, metal glow plugs are made of a metal shaft with a heating element at the end.
Ceramic glow plugs are typically more expensive than metal glow plugs, but they are known to last longer and perform better in extreme operating conditions because of their ability to withstand higher temperatures. They are also less likely to corrode or experience electrical arcing, which can cause misfiring and engine damage.
In terms of performance, ceramic glow plugs produce a more consistent and efficient heat compared to metal glow plugs. They also have a faster warm-up time, which reduces cold starting problems and emissions. This is especially beneficial for diesel engines, where fast and efficient ignition of the fuel mixture is critical for optimal performance.
Overall, ceramic glow plugs are the preferred choice for diesel engines, while metal glow plugs are more commonly used in gasoline engines.