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Archaic Greece its connotations in English of being primitive and outdated. No term which has been suggested to replace it has gained widespread currency, however, and the term is still in use. Much of our evidence about the Classical period of ancient Greece comes from written histories, such as Thucydides' History of the Peloponnesian War. By contrast, we have no such evidence from the Archaic period. We have written accounts of life in the period in the form of poetry, and epigraphical evidence, including parts of law codes, inscriptions on votive offerings, and epigrams inscribed on tombs. However, none of this evidence