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← TechnologyWhich risk severely increases when an engine speed limit is overridden?
A)Torsional crankshaft resonance and fracture✓
B)Decreased connecting rod big-end lubrication
C)Valve float and decreased volumetric efficiency
D)Catalytic converter overheating and damage
💡 Explanation
Excessive RPM causes torsional crankshaft resonance; the alternating torques exceed material limits because this mechanical resonance amplifies the stresses in the crankshaft, leading to fracture; therefore, fracture risk is highest, rather than alternatives like valve float directly induced by RPM.
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