What is spark

spark test

[box style=”0″]Glossary “spark test” Definition:
A quick check of the ignition system made by carefully placing a metal end of one of the spark plug wires close to the engine while cranking the engine to see if there is a spark gap and to determine its intensity.[/box]

spark plug fouling

[box style=”0″]Glossary “spark plug fouling” Definition:
An accumulation of deposits on the lower, exposed end of the spark plug that act as an electrical conductor, thereby creating a path for electricity to travel to ground, rather than jump across the electrode gap.[/box]

spark plug heat range

[box style=”0″]Glossary “spark plug heat range” Definition:
The temperature limits, hot, normal, or cold, within which a spark plug is designed to operate. It is determined by varying the length of the exposed lower section of the plug ceramic insulator.[/box]

spark line

[box style=”0″]Glossary “spark line” Definition:
The line on an oscilloscope that indicates the voltage required to fire the spark plug and the number of degrees the distributor turns while the spark exists.[/box]

spark plug

[box style=”0″]Glossary “spark plug” Definition:
An ignition component threaded into the cylinder head that contains two electrodes extending into the cylinder that form a gap across which high-voltage electricity arcs to ignite the compressed A/F mixture.[/box]

spark knock

[box style=”0″]Glossary “spark knock” Definition:
Term used for detonation or ping. Secondary rapid burning of the A/F mixture in the combustion chamber causing a second flame front that collides with the first flame front and produces a engine knock.[/box]

spark delay valve (SDV)

[box style=”0″]Glossary “spark delay valve (SDV)” Definition:
A vacuum valve acting like a restrictor, used in the vacuum line between the distributor and carburetor, to delay vacuum-timing advance under certain driving conditions to reduce NOx emissions.[/box]