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2. Spark plug - Wikipedia

   en.wikipedia.org/wiki/Spark_plug

   Spark plug with single side electrode An electric spark on the spark plug. 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 ...

3. Engine knocking - Wikipedia

   en.wikipedia.org/wiki/Engine_knocking

   Under ideal conditions the common internal combustion engine burns the fuel/air mixture in the cylinder in an orderly and controlled fashion. The combustion is started by the spark plug some 10 to 40 crankshaft degrees prior to top dead center (TDC), depending on many factors including engine speed and load.

4. Pre-ignition - Wikipedia

   en.wikipedia.org/wiki/Pre-ignition

   Carbon deposits form a heat barrier and can be a contributing factor to pre-ignition. Other causes include: An overheated spark plug (too hot a heat range for the application). Glowing carbon deposits on a hot exhaust valve (which may mean the valve is running too hot because of poor seating, a weak valve spring or insufficient valve lash)

5. Spark gap - Wikipedia

   en.wikipedia.org/wiki/Spark_gap

   A spark plug.The spark gap is at the bottom. A spark plug uses a spark gap to initiate combustion.The heat of the ionization trail, but more importantly, UV radiation and hot free electrons (both cause the formation of reactive free radicals) [citation needed] ignite a fuel-air mixture inside an internal combustion engine, or a burner in a furnace, oven, or stove.

6. Talk:Spark plug - Wikipedia

   en.wikipedia.org/wiki/Talk:Spark_plug

   Common spark plug conditions opc.mr2oc.com; Another plug colour gallery. Ford To Replace Spark Plugs With Freakin' Lasers by 2011; Might have once been acceptable as a supporting ref to article body content re laser ignition, except that: It's stale. Especially when claiming 2011, we'd want to see newer and more detailed news by now.

7. Electric spark - Wikipedia

   en.wikipedia.org/wiki/Electric_spark

   A spark on a spark plug Lightning is a natural example of an electric spark. An electric spark is an abrupt electrical discharge that occurs when a sufficiently high electric field creates an ionized, electrically conductive channel through a normally-insulating medium, often air or other gases or gas mixtures.