Which failure mode emerges when sustained engine knocking subjects an internal combustion engine's crankshaft to cyclical stress exceeding endurance limits?

💡 Explanation

Torsional fatigue cracking appears because cyclical stress concentrates at stress risers on the crankshaft, initiating and propagating cracks; therefore, the crankshaft fails due to material fatigue, rather than loss of lubrication (hydroplaning) or compression (blow-by).

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