Which risk increases when cyclic combustion pressure variations occur in a four-cylinder engine crankshaft.?

💡 Explanation

When cyclic pressure variations occur causing torsional vibration, stress concentrations at the crankshaft journals will promote fatigue crack formation because of the fluctuating torque loads. Therefore torsional fatigue is increased, rather than bearing wear, ring flutter, or valve float which are related to lubrication issues, blow-by effects, and valve train dynamics respectively.

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