- spark advance
- The angular position of the crankshaft, relative to top dead center, at the moment of spark ignition. A 15° spark advance means that the spark is applied when the crankshaft is 15° from reaching top dead center on the compression stroke.Normal position when spark takes place.Position of piston and crankshaft when spark is advanced by 15°.
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spark advance — Causing the spark plug to fire earlier by altering the position of the distributor breaker points in relation to the distributor shaft. See advance electronic spark advance ignition advance … Dictionary of automotive terms
spark advance — noun the timing of ignition relative to the position of the piston in an internal combustion engine • Syn: ↑lead • Hypernyms: ↑timing * * * noun : lead II 3d(2) … Useful english dictionary
orifice spark advance control — (OSAC) a device used by Chrysler to apply vacuum advance over a period of time. By limiting the timing advance rate, NOx is reduced … Dictionary of automotive terms
electronic spark advance — (ESA) the part of an ECU that controls ignition timing and dwell angle … Dictionary of automotive terms
advance —  The act of changing the ignition timing so that the spark occurs earlier in the cycle. The opposite is retard.  It may refer to the device which makes this adjustment. Also see automatic advance centrifugal advance electronic spark advance … Dictionary of automotive terms
spark — The bridging or jumping of a gap between two electrodes by a current of electricity. One of the essential factors in a combustion engine (Fuel, Air, Proper proportion of mixture, compression, timing, Spark). See electronic spark advance… … Dictionary of automotive terms
spark delay valve — (SDV) a valve in the vacuum advance hose that delays the vacuum to the vacuum advance unit during rapid acceleration from idle or from speeds below 15 mph, and cuts off spark advance immediately on deceleration. Has an internal sintered orifice… … Dictionary of automotive terms
advance — advancingly, adv. /ad vans , vahns /, v., advanced, advancing, n., adj. v.t. 1. to move or bring forward: The general advanced his troops to the new position. 2. to bring into consideration or notice; suggest; propose: to advance reasons for a… … Universalium
advance — ad•vance [[t]ædˈvæns, ˈvɑns[/t]] v. vanced, vanc•ing, n. adj. 1) to move or bring forward in position 2) to bring into consideration; suggest; propose: to advance reasons for a tax cut[/ex] 3) to further the development, progress, or prospects… … From formal English to slang
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