A spark plug is a vital element of your car’s ignition system. Its purpose is to ignite the air/fuel mixture in an internal combustion engine. The combustion begins when a spark moves between the two electrodes of the plug, hence the name.
A spark plug is composed of a central electrode and an insulated wire, both placed in an electrically isolated shell. The wire connects the plug with the output terminal of the elements of the ignition system: an ignition coil or magneto. The central electrode is usually the cathode of the spark plug. Nowadays, the central electrode is made using two metals: the interior is made of copper and the exterior is made of steel. The outer steel part heats almost immediately providing a fast and reliable engine start, and a steady functioning.
In order to increase the durability of the spark plug, Bosch uses alloys of steel and noble metals (such as tungsten, iridium, palladium, rhodium and platinum) to make the central electrode. This allows reduction of the effects of corrosion and electrochemical destruction. The usage of those metals also makes the central electrode thinner. This has a positive impact on the efficiency of the ignition of the air/fuel mixture.
A lifespan of a spark plug is somewhere between thirty and one hundred thousand kilometers. After that you have to replace it with a new one. It is a fast and simple process, but it is always better to buy a spark plug that lasts longer and is more reliable. Bosch spark plugs are produced using the best materials and a manufacturing process tested for decades. When you buy their production you make sure that your car will function properly for many years to come.
Don’t forget that replacing the spark plugs in time is one of the basic rules that every car owner should know.