Bosch glow plugs and spark plugs

More than 100 years of competence

The invention of the glow plug and spark plug paved the way for Bosch to become a globally successful developer and automotive supplier. Both products strongly influenced progress in vehicle engine development and are still being further developed today.

Competence and Know-how

Bosch has comprehensive know-how and extensive experience in the areas of gasoline and diesel injection. In close cooperation with vehicle manufacturers, Bosch develops spark plugs and glow plugs for original equipment, tailored to the requirements of the respective engine.

Extensive range

Throughout the last 120 years, Bosch has developed more than 20,000 different spark plug types. Today's program offers spark plugs for passenger cars, small engines and industrial applications. Over the last 100 years, Bosch glow plugs have been continuously adapted to the changing requirements of diesel engines and have become increasingly powerful. They are now offered for almost every diesel vehicle in Europe.

Glow plugs

Duraterm

The 11-volt glow plugs developed by Bosch in 1990 are based on comprehensive Bosch diesel experience and OE know-how.

Advantages at a glance

Comfortable starting behavior through short preheating and long post-glow times

More than just a starting aid by correctly adjusting the supply to the engine with the required temperature

Outstanding starting comfort via a very short heating phase, high glow temperatures and long post glowing

Smooth operation and high comfort across all load ranges by regeneration heating

Quiet idling and high comfort across all load ranges from additional functions such as intermediate and regeneration heating

Easy on the alternator, designed for low voltages in case of cold starts

Duraterm HighSpeed

For improved and reliable combustion in rather newer diesel engines. Quick preheating and long postglow times of these penciltype glow plugs developed by Bosch contribute to increased fuel efficiency while ensuring a long service life.

Duraterm

Featuring a Bosch-invented design, these glow plugs are particularly robust. The shape of their ceramic heating elements and their location inside a support tube reduce the risk of breakage even if subject to transverse forces.

Glow plugs Function

Much more than just a starting aid: Modern glow plugs do not only preheat the engine during the start-up, they also post-glow. This means they remain active although the engine is already running. In this manner, they ensure efficient and fuel-economic engine operation even in stop-and-go or city traffic.

Regeneration of particulate filters

Diesel particulate filters separate soot particles from exhaust gases. In order to prevent them from clogging the filter, separated soot particles are to be burnt periodically. This procedure is supported by modern glow systems heating up the filter by means of regeneration glowing.

Starting systems

Starting systems are used for diesel vehicles with max. 1 liter cubic capacity per cylinder. These systems increase the temperature inside the combustion chamber. For a reliable cold start, glow plug temperatures of at least 850 °C are required – closely related to the engine design and condition as well as to the ambient temperatures.

Post glow

Innovative diesel engines feature a lower compression. As a result, the diesel-air mixture does not ignite itself anymore in case of a cold engine. A post-glow system is thus required. It remains active even though the engine is already running – for comfortable and fuel-efficient engine operation e.g. in city or stop-and-go traffic.

Glow plugs Regular checking

Glow plugs are wearing parts. Their functionality should be checked at regular intervals.

Watch out! Listen up!

Different failures can be indicators for defective glow plugs:
1 . increased smoke generation in case of cold starts
2. loud combustion noises before reaching the operating temperature
3. unevenly running warm engine
4. loss of power

Safe and accurate functional testing

Measurement procedure
1. the resolution of the multimeter should be less than 100 mOhm ◾ clean the contacts, removing oil, dust or corrosion residues.
2. determine the inherent resistance (offset) of the multimeter: connect both measuring electrodes and read out the measured value 3. measuring points for installed glow plugs (engine switched off): Place the electrodes of the measuring instrument on the glow plug connector and on the engine housing (ground)
4. glow-plug resistance = measured value minus inherent resistance (offset) of the multimeter
Evaluation
Resistance ∞ Ω: malfunction: defective glow plug
Resistance < 0,2 Ω: malfunction: defective glow plug
Resistance > 0,2 Ω and < 5 Ω: glow plug OK

Spark plugs

Scope of application

Bosch spark plugs are designed for a permanently reliable ignition performance in the respective engine. They are developed and produced with the same quality as original equipment spark plugs.

Bosch Platinum

Bosch Double-Platinum

Bosch Iridium

Bosch Double-Iridium

Bosch EVO

Advantages at a glance

Outstanding engine protection due to nickel-plated housing and thread

Excellent ignitability for high performance due to specifically developed precious metals or alloys of the center electrode

Hassle-free spark plug replacement due to factory-set electrode gap

High wear resistance due to highly heat-conductive electrodes

High gas tightness and stable heat value through heat shrink assembly

What drives you, drives us

Bosch technologies are used in most vehicles worldwide.
People, and assuring their mobility, is what we are focused on.
Therefore, we have dedicated over 130 years of pioneering spirit and expertise in research and manufacturing to achieving this.
We provide the aftermarket and workshops worldwide with modern diagnostic and workshop equipment and a wide range of spare parts for passenger cars and commercial vehicles:
◾ solutions for efficient vehicle repairs
◾ innovative workshop equipment and software
◾ one of the world’s most comprehensive ranges of new and exchange parts
◾ large network of wholesale customers, for quick and reliable parts supply
◾ competent hotline support
◾ comprehensive educational and training offers
◾ targeted sales and marketing support

Scope of application

Bosch spark plugs are designed for a permanently reliable ignition performance in the respective engine. They are developed and produced with the same quality as original equipment spark plugs.

Bosch Nickel

Bosch Super 4

Advantages at a glance

Outstanding engine protection due to nickel-plated housing and thread

Smooth engine operation and steady acceleration due to a high heat conductivity of the ground electrode made of nickel alloy

Hassle-free spark plug replacement due to factory-set electrode gap

High wear resistance due to a highly heat-conductive center electrode with copper core

High gas tightness and stable heat value through heat shrink assembly

Outstanding engine protection due to nickel-plated housing and thread

Lag-free acceleration due to excellent ignitability by means of four thin electrodes with long spark gaps

Outstanding protection against carbon fouling due to surface air-gap technology

Hassle-free spark plug replacement due to factory-set electrode gap

High gas tightness and stable heat value through heat shrink assembly

Bosch glow plugs and spark plugs

More than 100 years of competence

Competence and Know-how

Extensive range

Glow plugs

Duraterm

Advantages at a glance

Duraterm HighSpeed

Duraterm

Glow plugs Function

Regeneration of particulate filters

Starting systems

Post glow

Structure of Duraterm HighSpeed

Structure of DuraSpeed

Glow plugs Regular checking

Watch out! Listen up!

Safe and accurate functional testing

Spark plugs

Scope of application

Bosch Platinum

Bosch Double-Platinum

Bosch Iridium

Bosch Double-Iridium

Bosch EVO

Advantages at a glance

What drives you, drives us

Structure of Duraterm HighSpeed

Workshop tips in the video

Changing spark plugs you know how

Scope of application

Bosch Nickel

Bosch Super 4

Advantages at a glance