Which of the following defines detonation in an engine?

Detonation in an engine refers to a condition characterized by a rapid rise in cylinder head pressure and temperature. This phenomenon occurs when the air-fuel mixture in the engine's cylinder ignites prematurely, resulting in an explosive reaction rather than a smooth, controlled burn. This rapid increase in pressure and temperature can lead to engine knocking or pinging sounds, which can cause significant engine damage if not addressed.

The understanding of detonation is crucial for maintaining engine performance and longevity, as it can lead to issues such as hole burnout in pistons or damage to valves and the cylinder head. Recognizing this condition allows pilots and mechanics to take preventive measures in engine operation and maintenance, such as using fuels with appropriate octane ratings to minimize the risk of detonation.