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Insulator nose, electrodes and spark plug shell covered with velvet-like dull black soot deposits.Ĭause: Incorrect mixture setting (carburetor fuel injection) mixture too rich, air filter very dirty, automatic choke not in order or manual choke pulled too long, mainly short-distance driving, spark plug too cold, heat-range code number too low.Įffects: Misfiring, difficult cold-starting. No deposits from fuel additives containing lead or from alloying constituents in the engine oil. Mixture setting and ignition timing are correct, no misfiring, cold-starting device functioning. Insulator nose grayish-white or grayish-yellow to brown. Reading the spark plugs provides valuable information on spark plug and engine operating conditions. Platinum+4 uses race-tested technology including multiple electrode paths and more pure platinum to generate strong, consistent sparks. These changes can be caused by: Electrode wear Engine wear Abnormal operating conditions (pre-ignition, detonation, high oil consumption) Independent tests have shown that installing premium spark plugs such as Bosch’s Platinum+4 improves fuel mileage by as much as 4.8% over original equipment plugs. When the required voltage reaches a level that can no longer be compensated for by the voltage reserve, the result is misfiring. In the course of its service life, the spark plug undergoes changes that increase the required ignition voltage. In all, Bosch has developed more than 20,000 different types of spark plugs over the last 100 years.ĭuring operation, the spark plug is subjected to both wear and to fouling and should be replaced at regular intervals. Design variants and special materials such as platinum, silver, or yttrium allow Bosch spark plugs to be used in a wide variety of applications today. There is a large variety of different spark plug designs with more than 1,400 variations. What are the different types of spark plugs? It plays a major role in fuel economy, clean, efficient combustion, and the reliable operation of engines and catalytic converters. Today, the continuously developing spark plug is a key engine system component. For 100 years, Bosch Spark Plugs have been designed for optimal performance, reliable functioning, and to withstand extreme operating conditions. These requirements apply throughout the entire service life of the spark plug. It must permit reliable cold starting, it must guarantee that there is no misfiring during acceleration, and it must withstand the engine being operated for hours on end at maximum power. The spark plug is an important factor in determining optimal performance and reliable functioning of an engine. It accomplishes this task by generating a spark between its electrodes, which then generates the required heat to ignite a smooth burn of the air/fuel mixture.
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The function of the spark plug is to introduce the ignition energy into the combustion chamber and to initiate combustion of the compressed air-fuel mixture. What is the function of a spark plug and why is it a vital engine component?