Spark plug

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A spark plug (sometimes, in British English, a sparking plug[1], and, colloquially, a plug) is a device for delivering electric current from an ignition system to the combustion chamber of a spark-ignition engine to ignite the compressed fuel/air mixture by an electric spark, while containing combustion pressure within the engine.[2][3] A spark plug has a metal threaded shell, electrically isolated from a central electrode by a ceramic insulator.[4]

References

  1. The Bosch book of the Motor Car, Its evolution and engineering development. St. Martin's Press. 1975. pp. 206–207
  2. https://vinsonar.com/help/spark-plug-guide/
  3. https://forboat.eu/marine-engine-spare-parts-for-boat/marine-spark-plugs-for-boat
  4. https://books.google.com/books?id=X3l0MMSMoXUC