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← TechnologyWhich mechanical phenomenon initiates uncontrolled engine knocking when pre-ignition occurs within a piston cylinder?
A)Resonance frequency of combustion chamber
B)Transition to detonative flame propagation✓
C)Laminar-turbulent flow within injectors
D)Harmonic balancer decoupling from crankshaft
💡 Explanation
Detonation initiates engine knocking because rapid, supersonic flame propagation suddenly increases cylinder pressure, rather than controlled deflagration. This causes shockwaves damaging pistons and cylinders; therefore, options portraying related issues do not cause similar immediate failure.
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