spark advance


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°.

Aviation dictionary. 2014.

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  • 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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