Pre-ignition Pre-ignition Pre-ignition (or preignition) in a spark-ignition engine is a technically different phenomenon from engine knocking, and describes the event wherein the air/fuel mixture in the cylinder ignites before the spark plug fires. Pre-ignition is initiated by an ignition source other than the spark, such as hot spots in the combustion chamber, a spark plug that runs too hot for the application, or carbonaceous deposits in the combustion chamber heated to incandescence by previous engine combustion events. The phenomenon is also referred to as 'after-run', or 'run-on' or sometimes dieseling, when it causes the engine to carry on running after
Maritime Archaic Maritime Archaic The Maritime Archaic is a North American cultural complex of the Late Archaic along the coast of Newfoundland, the Canadian Maritimes and northern New England. The Maritime Archaic began in approximately 7000 BC and lasted into the 18th century. The culture consisted of sea-mammal hunters in the subarctic who used wooden boats. Maritime Archaic sites have been found as far south as Maine and as far north as Labrador. Their settlements included longhouses, and boat-topped temporary or seasonal houses. They engaged in long-distance trade, as shown by white chert from northern Labrador being found as far south as