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← TechnologyWhich outcome arises when excessive pre-ignition occurs within an internal combustion engine cylinder?
A)Piston crown overheating and melting✓
B)Crankshaft bearing lubrication failure
C)Exhaust valve burning from late opening
D)Turbocharger overspeed from backpressure
💡 Explanation
When excessive pre-ignition takes place, the air-fuel mixture ignites prematurely because of hot spots, leading to uncontrolled combustion and intense heat transfer to the piston. Therefore piston crown overheating and melting results, rather than crankshaft, valve, or turbocharger damage which involves different failure modes.
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