Pre-ignition for an automobile engine to continue on for thousands of kilometers with mild detonation, pre-ignition can destroy an engine in just a few strokes of the piston. 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
Delco ignition system Delco ignition system The Delco ignition system, also known as the Kettering ignition system, is a type of Inductive discharge ignition system invented by Charles F. Kettering. It was first sold commercially on the 1910 Cadillac and was manufactured by Delco. Over time, this system was used extensively by all automobile and truck manufacturers until the development of capacitor discharge ignition (electronic ignition) systems in the 1960s. Delco ignition systems were also used by a number of early aircraft engines. This ignition system uses an ignition coil wound as an autotransformer to step up the voltage from the 12 volts