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← ScienceWhich outcome occurs when an internal combustion engine's air-fuel mixture auto-ignites prior to spark?
A)Detonation causes cylinder pressure spikes✓
B)Lean mixtures suppress flame propagation
C)Fuel efficiently burns at TDC crank
D)Exhaust recirculation improves knock resistance
💡 Explanation
Cylinder detonation occurs because uncontrolled, premature combustion increases peak pressures via uncontrolled flame propagation, therefore pressures sharply rise, rather than a controlled burn; other options involve different mechanisms that reduce, not cause, detonation.
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