Spark Plug: Locations

Spark Plugs, Location/Task/Design/Function




R4 Spark plug

Spark plugs, location
One or two spark plugs per cylinder are fitted in the cylinder head

Spark plugs, task
Igniting the inducted and compressed fuel-air mixture as a result of arcing between the electrodes.

Spark plugs, design
In the manufacturer's type symbols, all the spark plug features are assigned (e.g. heat rating, shape of seating, thread, width across flats, electrode material, spark position).

Spark plugs, function
The ignition voltage flows from the directly-inserted ignition coils or along short ignition cables to the spark plugs and causes arcing in the gap between the central electrode and ground electrode.