This article or section should include material from Spark gap
A spark plug is an electrical device that fits into the cylinder head of some internal combustion engines and ignites compressed aerosolgasoline by means of an electric spark. Spark plugs have an insulated wire which is connected with a induction coil or magneto circuit on the outside, and forms, with another terminal on the base of the plug, a spark gap inside the cylinder. The spark plug was invented by Nikola Tesla, US patent 609,250,1898 (http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=/netahtml/srchnum.htm&r=1&f=G&l=50&s1=609250.WKU.&OS=PN/609250&RS=PN/609250)
Spark plugs are typically designed to have a variable spark gap. The spark gap may be adjusted by the technician installing the spark plug. A spark plug gap gauge is used to set the gap. The simplest gauges are a collection of keys of various thicknesses which match the desired gaps and the gap is adjusted until the key fits snugly.
Internal combustion engines can be divided into spark-ignition engines, which require spark plugs to begin combustion, and compression-ignition engines (diesel engines), which compress the fuel/air mixture until it spontaneously ignites. Compression-ignition engines may use glow plugs to improve cold start characteristics.
Changing the sparkplugs at the recommended intervals was cheap insurance to prevent misfiring and costly parts repairs.
Sparkplugs are numbered as to their heat range (operating temperature of the sparkplug tip), thread size and length, and type of gasket or seal to the engine.
If a sparkplug starts to bind while it is being turned out, turn it back in and out again a few times to try and break any carbon off the sparkplug threads as you remove it.
Feeds |
Contact