How glow plug works in engine?

A glow plug is a heating device used in diesel engines to aid in the starting process. Diesel engines rely on compression to generate the heat necessary to ignite the fuel, and at low temperatures, this can be difficult to achieve. Glow plugs provide additional heat to the combustion chamber, making it easier for the fuel to ignite and start the engine.

Here's how a glow plug works:

1. When the ignition key is turned on, an electrical current is supplied to the glow plug.

2. This current flows through a heating element inside the glow plug, causing it to heat up.

3. The heating element is in contact with the air inside the combustion chamber, and it transfers heat to the air.

4. The heated air helps to raise the temperature of the combustion chamber, making it easier for the fuel to ignite when it is injected into the cylinder.

5. Once the engine has started, the glow plug is usually turned off.

Glow plugs are typically made of ceramic or metal, and they may be either solid or hollow. Solid glow plugs have a single heating element, while hollow glow plugs have a heating element that is surrounded by a ceramic insulator. Hollow glow plugs are more efficient at transferring heat to the air, and they are less likely to overheat and fail.

Glow plugs are an important part of diesel engines, and they play a key role in ensuring that the engine starts smoothly and reliably, even in cold weather conditions.