Spark plug | Wikipedia audio article
Channel: wikipedia tts
Date: 02/10/2019

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Spark_plug


00:01:30 1 History
00:03:02 2 Operation
00:04:50 3 Spark plug construction
00:06:02 3.1 Parts of the plug
00:06:11 3.1.1 Terminal
00:07:25 3.1.2 Insulator
00:08:19 3.1.3 Ribs
00:09:01 3.1.4 Insulator tip
00:10:38 3.1.5 Seals
00:11:15 3.1.6 Metal case/shell
00:12:11 3.1.7 Central electrode
00:16:30 3.1.8 Side (ground, earth) electrode
00:17:16 3.2 Spark plug gap
00:19:19 3.3 Variations on the basic design
00:20:34 3.4 Surface-discharge spark plug
00:22:08 3.5 Sealing to the cylinder head
00:22:52 3.6 Tip protrusion
00:24:26 4 Heat range
00:29:18 5 Reading spark plugs
00:31:47 6 Indexing spark plugs
00:33:13 7 See also



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SUMMARY
=======
A spark plug (sometimes, in British English, a sparking plug, 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. A spark plug has a metal threaded shell, electrically isolated from a central electrode by a porcelain insulator. The central electrode, which may contain a resistor, is connected by a heavily insulated wire to the output terminal of an ignition coil or magneto. The spark plug's metal shell is screwed into the engine's cylinder head and thus electrically grounded. The central electrode protrudes through the porcelain insulator into the combustion chamber, forming one or more spark gaps between the inner end of the central electrode and usually one or more protuberances or structures attached to the inner end of the threaded shell and designated the side, earth, or ground electrode(s).
Spark plugs may also be used for other purposes; in Saab Direct Ignition when they are not firing, spark plugs are used to measure ionization in the cylinders – this ionic current measurement is used to replace the ordinary cam phase sensor, knock sensor and misfire measurement function. Spark plugs may also be used in other applications such as furnaces wherein a combustible fuel/air mixture must be ignited. In this case, they are sometimes referred to as flame igniters.