Knock (Detonation)

Knock, or detonation, occurs in an engine when fuel-air mixture in the cylinder ignites prematurely or unevenly, causing a sudden, explosive burning instead of a smooth combustion. This rapid ignition produces shock waves that can damage engine parts, reduce performance, and increase emissions. Normally, the spark plug causes controlled ignition, but knock happens when temperature or pressure gets too high, or the fuel isn't suitable. To prevent it, engines often use higher-octane fuel, better cooling, or timing adjustments. Recognizing and controlling knock is essential for engine health, efficiency, and longevity.