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← TechnologyWhich outcome occurs when increased pre-ignition bends a crankshaft?
A)Bearing surface fatigue accelerates✓
B)Thermal efficiency improves negligibly
C)Torsional vibration decreases greatly
D)Volumetric displacement rises slightly
💡 Explanation
Increased pre-ignition elevates pressures which overload the crankshaft causing plastic deformation; this is known as crankshaft bend. Accelerated bearing fatigue results because the changed geometry increases stress concentrations on the bearing surfaces, therefore, answer A, rather than influencing efficiency or displacement.
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