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Which outcome occurs in high-performance engines operating near peak RPM when crankshaft torsional vibrations amplify?

A)Harmonic balancer failure
B)Increased fuel consumption
C)Reduced exhaust emissions
D)Premature valve spring fatigue

💡 Explanation

Harmonic balancer failure occurs because amplified torsional vibrations induce excessive stress on the crankshaft and its attachments, specifically by resonance. This mechanical resonance strains the mountings; therefore, balancer failure results, rather than improved fuel efficiency or reduced emissions.

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