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← TechnologyWhich mode dominates crankshaft failure when forced induction increases cylinder pressures?
A)Torsional fatigue crack propagation✓
B)Complete seizure of the big-end
C)Excessive plastic deformation yielding
D)Surface pitting from oil starvation
💡 Explanation
Torsional fatigue arises because increased cylinder pressure magnifies torque pulses. This cyclical loading causes stress concentration in the crankshaft’s fillets promoting crack initiation and propagation, therefore leading to fatigue failure, rather than plastic deformation under steady load.
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