Engine detonation
Asked by: Steve 2475 views Aircraft Systems, Commercial Pilot, Flight Instructor, General Aviation, Private Pilot, Student Pilot
Definition for detonation goes as spontaneous combustion of the end gas remaining in the cylinder chamber, and it always occurs after normal combustion is initiated by the spark plug.
The definition also says that severe heat and pressure causes the end gas in the chamber to spontaneously combusts.
From the textbook, we learned that the detonation is also caused by using lower grade of fuel and the lower fuel grade is less resistant to combustion compared to higher octane rated fuel(AVGAS80 vs 100LL). Also high manifold pressure is one of the cause to detonation.
If we used lower fuel grade, it will burn easier, so why do we have unburnt fuel/mixture in the cylinder that burns after initial combustion?
Secondly, how does the high manifold pressure induces the detonation?
Steve.
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