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
Henderson archaic pigeon Henderson archaic pigeon The Henderson archaic pigeon ("Bountyphaps obsoleta"), or Henderson Island archaic pigeon, is an extinct bird in the Columbidae, or pigeon family. It was described in 2008 as a new genus and species from subfossil remains found on Henderson Island in the Pitcairn Group of south-eastern Polynesia. The genus was named for both the ship HMS "Bounty" with which, following the famous mutiny, Europeans first discovered the Pitcairn Islands, and for the former bounty the bird provided as food; with the Greek "phaps" (wild pigeon). The specific epithet comes from the Latin adjective for "extinct" or "forgotten about".