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Which outcome occurs when localized 'hot spots' raise piston temperature?

A)Premature detonation within combustion chamber
B)Increased volumetric efficiency within cylinder
C)Lower exhaust emissions under lean burn
D)Decreased friction against cylinder wall

💡 Explanation

Premature detonation results from localized heating because autoignition temperature is reached before spark ignition initiates; this is knocking. Elevated temperature causes pre-ignition, therefore detonation, rather than controlled combustion under normal timing regimes.

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