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← ScienceWhich consequence results when an uncooled two-stroke engine exceeds optimal throttle during operation?
A)Increased thermal fatigue cracking initiation✓
B)Elevated convective heat transfer efficiency
C)Reduced boundary layer lubrication effectiveness
D)Phased harmonic resonance stabilization achieved
💡 Explanation
Exceeding the optimal throttle creates excessive combustion events, causing increased heat and cylinder pressure; because heat cannot dissipate rapidly enough, thermal fatigue occurs. This causes cracking, rather than increased heat transfer, lubrication, or harmonic resonance, because structural limits are surpassed.
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