spark plug

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spark plug:

see ignitionignition,
apparatus for igniting a combustible mixture. The German engineer Nikolaus A. Otto, in his first gas engine, used flame ignition; another method was heating a metal tube to incandescence.
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The Columbia Electronic Encyclopedia™ Copyright © 2013, Columbia University Press. Licensed from Columbia University Press. All rights reserved.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Spark Plug


a device used to ignite the air-fuel mixture in the cylinders of internal-combustion engines equipped with carburetors. The mixture is ignited by a spark passing between the spark plug’s electrodes. Spark plugs are threaded into the engine’s cylinder head and consist of a steel shell with a side electrode and an insulator with a center electrode. A terminal is mounted on the top part of the center electrode. A high voltage is applied periodically across the gap between the center electrode and the side electrode, causing a spark to jump across the gap. The length of the skirt of the insulator determines the thermal characteristic of the spark plug. A short skirt provides a high heat transfer from the insulator to the shell. Spark plugs with short skirts are called cold plugs; those with long skirts are called hot plugs. Cold plugs are used for continuous engine operation under heavy loads or at elevated temperatures. [23–208–]

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.

spark plug

[′spärk ‚pləg]
A device that screws into the cylinder of an internal combustion engine to provide a pair of electrodes between which an electrical discharge is passed to ignite the explosive mixture.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

Spark plug

A device that screws into the combustion chamber of an internal combustion engine to provide a pair of electrodes between which an electrical discharge is passed to ignite the combustible mixture. The spark plug consists of an outer steel shell that is electrically grounded to the engine and a ceramic insulator, sealed into the shell, through which a center electrode passes (see illustration). The high-voltage current jumps the gap between the center electrode and the ground electrode fixed to the outer shell.

The electrodes are made of nickel and chrome alloys that resist electrical and chemical corrosion. Some center electrodes have a copper core, while others have a platinum tip. Many spark plugs have a resistor in the center electrode to help prevent radio-frequency interference. The parts exposed to the combustion gases are designed to operate at temperatures hot enough to prevent electrically conducting deposits but cool enough to avoid ignition of the mixture before the spark occurs. See Ignition system

McGraw-Hill Concise Encyclopedia of Engineering. © 2002 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
These 21st Century sparkplugs are carrying on a noble tradition maintained by generations of similarly feisty and turborcharged players, possibly going back to that late 19th Century terror John "Muggsy" McGraw, who stopped at nothing in order to prevail.
"He can't hit, he can't field, he can't run--all he can do is beat you," Durocher proclaimed in his second most often quoted utterance next to the purported "nice guys finish last," which may also have a bearing on the role of those sparkplugs who give no quarter.
Admittedly, none of the currently active sparkplugs mentioned--Eckstein, Counsell, Vina, Biggio and the rest--fits perfectly into the Stanky mold, none being as nasty as Durocher's archetype was between the lines.
As is obvious in the case of such acknowledged standouts as Vina and Biggio, sparkplugs need not be players of limited or, suspect talent.
In a way, Morgan and Fox might be categorized as having been sparkplugs with a code of sportsmanlike conduct--if there are such things in baseball.
Audi AG, a subsidiary of Volkswagen AG (Xetra: VW), is equipping its four cylinder engines with BorgWarner BERU Systems new double platinum sparkplugs.
The sparkplugs are designed for the new compact plug top ignition coils used in Audi's 1.8 and 2.0-litre TFSI engines.
Dubai: A jobless man has been accused of committing multiple thefts by using a sparkplug to smash cars windows before making off with cash, valuables and electronics among other items he could lay his hands on.
According to records, having received several complaints of thefts carried out using the same modus operandi, the police found a sparkplug beside a car targeted by a thief in similar fashion in Bur Dubai.
Upon examination at Dubai Police's forensic laboratory, forensic experts matched the fingerprints on the sparkplug with a 43-year-old Afghan man who had just been apprehended for theft.
Prosecutors charged the Afghan suspect of using a sparkplug to break car windows and steal a camera and lens worth Dh34,000 from the photographer's car and a sport bag that contained Dh2,000, a mobile, battery charger, flash memory and an earphone from the car of another complainant.
"We seized the sparkplug that was found beside the car robbed in Bur Dubai.