Ignition

As fit as ever: For several decades, asphalt ignition coils have been produced with Bosch quality. This type of ignition coil is installed at many classic vehicles and owes its name to the fact that isolation and mechanical fixing of the inside windings are realized by means of asphalt. Thanks to their large power reserves, asphalt ignition coils ensure a high running performance and a great starting behavior.

Bosch ignition leads are very robust and resistant to heat, cold and fluids. The connectors are corrosion-resistant thus ensuring safe contacts.

The exterior insulation is made of silicone. This contributes to the radio interference suppression and a long service life.

The ignition distributor is the component of the ignition system with most functions. It distributes the high-voltage generated by the ignition coil to the spark plugs. The triggering of the ignition sparks is either done by a contact set (contact-triggered ignition) or by a Hall or induction sensor (contact-less ignition). The ignition timing is adapted to the respective operating state of the engine by means of centrifugal and vacuum adjustment systems. The rotor located inside the ignition distributor limits the maximum engine speed (rpm) – to protect the engine from damage due to excessively high speeds.

There is high voltage inside ignition distributor caps. The components can feature up to 30 000 volts. The distributor rotor located under the cap redirects the ignition energy provided by the ignition coil which is then transferred to the spark plug via ignition leads.

Just like distributor caps, distributor rotors also need to be immune to creepage currents. There are two types of distributor rotors: one with engine speed limiter and one without.

Ignition contacts – also known as breaker contacts – are subject to extreme strains. Most of them complete more than 100 million switching cycles before having to be replaced.

Many modern-era classic vehicles are equipped with modern follow-up generations such as multi-spark or compact ignition coils. They complete the Bosch Classic product range for future classic vehicles.