Technology and trends

Spark plugs from Bosch
Marginal Column
Bosch spark plugs are the motorists' favourite

Bosch spark plugs

Readers of the German automobile magazine „auto, motor und sport“ have once again voted Bosch as the best brand in the spark plugs category in 2012.

  • Function

    Spark plugs from Bosch: The pacemaker for the engine

    Ignition in general

    Spark plugs are one of the most important components in vehicles with a gasoline engine. They are not only responsible for ensuring reliable starting but also play a crucial part in attaining optimum engine performance and dependable operation. This applies particularly to modern engine management systems, where spark plugs and their design are gaining in significance.

    The purpose of a spark plug is to ensure controlled combustion of the fuel in the engine. To do so a high voltage generated by the ignition coil is introduced into the combustion chamber and the compressed fuel/air mixture is then ignited by the electric spark passing between the electrodes.


    A special variation on a well-established theme

    The principle of the spark plug is brilliant in its simplicity. A conductor isolated from the engine passes a high-voltage pulse to an electrode, from where a spark jumps to a ground electrode. This spark ignites the mixture.

    The requirements a spark plug is able to satisfy are governed by the following: The design, the materials used and the manufacturing processes employed.

  • Trends

    Trendsetter: Bosch at the cutting edge


    Bosch put a lot into research and development and are thus constantly launching new series spark plugs to satisfy the highest requirements. This means: Lower consumption, reduced emissions and a more compact size. Being aware of the value of such innovative technology, the international automotive industry is always keen to work closely with Bosch right from the start.

    The particular features of Bosch development work:

    • Maximum precision as a matter of principle: Virtually tolerance-free production as well as new developments in terms of geometry, materials and manufacturing methods.
    • New materials: High-grade platinum, iridium and rhodium alloys help to counteract spark plug wear.
    • Exact positioning of the ignition sparks in the combustion chamber area is guaranteed by a long spark position.
    • An oriented ground electrode ensures reliable ignition for spray-guided direct injection engines.
    • Extremely compact installation dimensions: More scope for engine designers.
    • Computer simulation: On the way to a perfect spark plug for gasoline direct injection engines with a worldwide unique simulation method.
    • Substitute for expensive platinum: Bosch are researching into highly reliable electrode and contact materials with a view to reducing the cost and increasing the service life of spark plugs.
  • Downloads