NGK glow plugs must perform well even under the worst of conditions. NGK SPARK PLUG’s expertise is valued and appreciated by diesel car drivers and automobile manufacturers around the world.
Many years of glow plug experience
> 260 part numbers available for European markets
86% coverage of vehicles in operation in Europe (source: TecDoc)
80 D-Power* part numbers for faster stock rotation *available in some markets only
NGK Glow Plug Technologies
NGK glow plugs are setting new standards in glow plug technology. Glow plugs are mandatory to ensure a perfect engine start, especially in cold conditions. Under a certain temperature, the engine will not start without well-performing glow plugs. This is why NGK SPARK PLUG is constantly expanding its expertise.
There are two glow plug types: metal rod glow plugs and ceramic glow plugs. The two technologies have special characteristics in regard to thermal behavior. Many car manufacturers are not prepared to compromise on the quality and performance of their diesel glow plugs. This is why they choose the proven NGK technology.
Safe start-up from low ambient temperatures
Low emissions during warm-up phase
Stable idling running before engine reaches operating temperature
High-quality coating on shell for high resistance to corrosion
Unique shell design for excellent heat transfer
Perfect gas-tight sealing
High shear torque
High resistance to deformation and security of the heating coils
Types of Glow Plugs
Metal Rod 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.
Ceramic High-temperature 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.