- The timing of the ignition spark with respect to the piston position in the cylinder of a reciprocating engine. The ignition of the fuel-air mixture must take place when the piston is still moving upward during the compression stroke for the engine to produce maximum power. This ensures that the piston is pushed with the maximum force, as it starts moving down on its power stroke. See four-stroke cycle.
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Ignition timing — in an internal combustion engine is the process of setting the time that a spark will occur in the combustion chamber (during the power stroke) relative to piston position and crankshaft angular velocity. Setting the correct ignition timing is… … Wikipedia
ignition timing — It is important that the spark coming from the spark plugs ignites the air fuel mixture at the correct moment determined by the manufacturer of the engine. Often this is a few degrees before top dead center (BTDC). Suppose the specs indicate that … Dictionary of automotive terms
ignition-timing control — See vacuum ignition timing control … Dictionary of automotive terms
dynamic ignition timing — Before the introduction of a strobe light, ignition timing was done statically in that the distributor was moved a certain measured amount. With modern engines, a timing light or strobe light is used. It is connected, generally, with the spark… … Dictionary of automotive terms
static ignition timing — An obsolete timing procedure carried out by rotating the engine until the timing marks are aligned and then connecting a test lamp or a voltmeter between the negative coil terminal and ground; when the points open, the test lamp lights up or the… … Dictionary of automotive terms
basic ignition timing — The ignition timing on a non running engine according to the specifications. After the engine is running, the timing can be set more accurately … Dictionary of automotive terms
stroboscopic ignition timing — See dynamic ignition timing … Dictionary of automotive terms
mechanical ignition timing — Centrifugal and vacuum advance … Dictionary of automotive terms
vacuum ignition-timing control — See vacuum control … Dictionary of automotive terms
Timing mark — on pulley at 6° before TDC. A timing mark is an indicator used for setting the timing of the ignition system of an engine, typically found on the crankshaft pulley (as pictured) or the flywheel, being the largest radius rotating at crankshaft… … Wikipedia