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
The Archaic Course overdose shortly after its release. The Archaic Course The Archaic Course is the third studio album by Norwegian metal band Borknagar. It is the first album to feature Simen "ICS Vortex" Hestnæs on vocals following the departure of Kristoffer "Garm" Rygg (who, according to Øystein Brun, "didn't want to scream anymore"), and the first with guitarist Jens F. Ryland. The album also features contributions from Enslaved guitarist Ivar Bjørnson, although he was not credited as part of the band in the album's liner notes. This is also the last album to feature drummer and founding member Erik "Grim" Brødreskift, who