Which risk increases when an engine crankshaft vibrates excessively at high RPM?

💡 Explanation

When a crankshaft vibrates excessively at high RPM, harmonic resonance can occur because the crankshaft's natural frequencies align with the engine's firing frequency, leading to amplified stress and fatigue failure. Therefore harmonic resonance is the increased risk, rather than oil viscosity, pre-ignition, or valve float, which involve different mechanical causes.

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