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← ScienceWhich outcome results when exceeding thermal design limits of an IC engine?
A)Pre-ignition and engine knock initiates.✓
B)Maximum power per cycle increases.
C)Exhaust pollutants consistently decrease.
D)Volumetric efficiency improves cycle-over-cycle.
💡 Explanation
Pre-ignition occurs because localized hot spots initiate premature combustion, enabling autoignition. This process disrupts the normal timed combustion leading to engine knock; therefore pre-ignition occurs rather than the optimal power cycle because exceeding coolant temperatures overwhelms dissipation.
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