Types of Glow Plugs
Metal rod glow plugs are equipped with a heating coil in a glow rod made of heat-resistant metal.
A specific material – magnesium oxide – in the interior of this glow rod, protects the heating coil from vibrations and shocks. Magnesium oxide is also an outstanding thermal conductor. This is why the heat that is produced can quickly be dissipated outward.
Metal rod glow plugs can be allocated into three main groups. 1. Standard rod glow plugs 2. Self-regulating rod glow plugs 3. AQGS rod glow plugs.
This glow plug was developed by NGK SPARK PLUG to enable automotive manufacturers to comply with ever-stricter emissions standards.
One of the goals of these standards is to reduce the compression ratio in diesel engines. NHTC glow plugs reach a temperature of 1,000°C in less than two seconds. It can after-glow for more than ten minutes at temperatures of up to 1,350°C.
The ceramic high-temperature glow plug (“NHTC glow plug”, “New High Temperature Ceramic”) has a fully ceramic heating element.