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Details of Spark plug

The spark-plugs (To ignite the mixture (a mixture is a combination of two or more substances.) Air fuel, gas (at the microscopic level, a gas is described as a set of atoms or molecules very weakly bound and quasi ...) contained in the cylinder (a cylinder is a surface in space defined by a straight line (d), called the generator, passing through a point ...) must undergo a temperature rise .. .) is an element of some internal combustion engines . This is the device that causes inflammation of the gas in most spark ignition engines (diesel engines are fitted as glow plugs).

It derives, of course, named after the ignition system of the old engines, where a wick (wick The word means:) incandescent causes combustion (Combustion is an exothermic chemical reaction (ie with d ' production of energy ...) of the mixture, recalling candle lighting.

A little history
In 1885, the Belgian Etienne Lenoir invented a spark plug electric very close to those we use today (the day or the day is the interval between sunrise sunset,).

The ignition of a fuel (a fuel is a fuel that powers a motor (engine (engine is a device transforming a non-mechanical energy (wind, chemical, electrical, thermal .) is a device transforming a energy (in the common sense refers to any energy that can perform a job, produce heat,) non-mechanical (wind, chemical, electrical, thermal) heat. The This transforms the chemical energy of fuel ) by a spark was advocated by the Italian Volta in 1777, followed by Isaac  de Rivaz to the internal combustion engine commonly known as "engine explosion" in 1807.

Operation
The spark plug is a component of the ignition of the spark ignition engine ignition.

It is the vector (In mathematics, the vector is an object that conveys more information than the usual numbers, or scalars.) of the electric arc (An arc is an electrical current in a visible insulation  which occurs due to the high voltage (tension is a force for extension.) provided by the coil when the system switches ( with platinum or electronic) the command (Command: term used in many areas, it generally means an order or wish imperative.) allowing the combustion gas mixture, which releases the energy.

The tension which is necessary to trigger the arc is about 10 kV for a compression ratio close to 10. At atmospheric pressure (Atmospheric pressure is the pressure of the air at any point of an atmosphere.), The breakdown voltage (in electronic or electrical engineering) would be 10 times lower.

It is characterized by operating temperatures ranging from (700 to 1 000 ° C).

 Constitution

 The candle consists of a central electrode, insulated by porcelain, which can initiate an arc with electrode mass (mass is a fundamental property of matter which is manifested by both the inertia of the body ).

The length of the insulation determines the temperature (temperature of a system is an increasing function of the degree of thermal agitation of particles) the operation of the candle.

The candle is usually powered by electricity by a coil.

Number (A number is a concept which denotes a unit, a collection of units or a fraction of unity.)

Usually, there is a spark plug per cylinder. However, in order to optimize combustion, some engines are equipped with two spark plugs per cylinder (Twin Spark Ignition double at Alfa Romeo).

Gap setting

The spacing of the electrodes is fixed by the motor function of compression ratio, fuel, power (The word power is used in multiple domains with special meaning:) of the ignition coil and, Finally, energy expected. The gauge is usually set between 5 and 9 tenths of a millimeter.

Failures
Beadwork due to a "pearl" of dirt or carbon (complete Table - Extended Table), which bypasses the electrodes. Simply clean the electrodes to get into the candle. The beading is more common on the two-stroke engines.
The wear of the electrode, which leads to misalignment.
Soiling, usually due to poor combustion.
Insulation broken porcelain.
Poor torque resulting poor adjustment and a loss of compression.