Which risk increases when thermal stress cycles induce micro-cracks within an engine crankshaft?

A)Torsional fatigue failure at stress risers✓

B)Oil pump cavitation due to increased viscosity

C)Cylinder head cracking from induced vibrations

D)Valve timing drifting causing pre-ignition

💡 Explanation

When thermal stress cycles induce micro-cracks, stress concentration effects trigger torsional fatigue due to decreasing the load-bearing cross section at the stress risers of the crankshaft. Therefore fatigue failure results, rather than cavitation, cylinder cracking, or timing drift which involve unrelated mechanisms and components.

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Which risk increases when thermal stress cycles induce micro-cracks within an engine crankshaft?

💡 Explanation

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