Ignition timing Ignition timing In a spark ignition internal combustion engine, Ignition timing refers to the timing, relative to the current piston position and crankshaft angle, of the release of a spark in the combustion chamber near the end of the compression stroke. The need for advancing (or retarding) the timing of the spark is because fuel does not completely burn the instant the spark fires, the combustion gases take a period of time to expand and the angular or rotational speed of the engine can lengthen or shorten the time frame in which the burning and expansion should occur. In a
Archaic smile Archaic smile The Archaic smile was used by Greek Archaic sculptors, especially in the second quarter of the 6th century BCE, possibly to suggest that their subject was alive, and infused with a sense of well-being. One of the most famous examples of the Archaic Smile is the Kroisos Kouros. The dying warrior from the west pediment of the Temple of Aphaia, Aegina, Greece is an interesting context as the warrior is near death. In the Archaic Period of ancient Greece (roughly 600 BCE to 480 BCE), the art that proliferated contained images of people who had the archaic smile.