10 Facts About Spark plugs

Early patents for spark plugs included those by Nikola Tesla, Frederick Richard Simms and Robert Bosch .

Spark plugs plug is composed of a shell, insulator and the central conductor.

Spark plugs are specified by size, either thread or nut, sealing type, and spark gap.

Some spark plugs have a bare thread, which is a common type for motorcycles and ATVs Finally, in very recent years, a cup-style terminal has been introduced, which allows for a longer ceramic insulator in the same confined space.

Some spark plugs are manufactured without ribs; improvements in the dielectric strength of the insulator make them less important.

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Spark plugs are typically designed to have a spark gap which can be adjusted by the technician installing the spark plug, by bending the ground electrode slightly.

Spark plugs plug gap gauge is a disc with a sloping edge, or with round wires of precise diameters, and is used to measure the gap.

Spark plugs plug is said to be "hot" if it is a better heat insulator, keeping more heat in the tip of the spark plug.

Spark plugs plug's firing end will be affected by the internal environment of the combustion chamber.

Some plugs are made with a non-random orientation of the gap and are usually marked as such by a suffix to the model number; typically these are specified by manufacturers of very small engines where the spark plug tip and electrodes form a significantly large part of the shape of the combustion chamber.