Which risk is increased when thermal expansion causes excessive piston-to-cylinder clearance in combustion engine?

💡 Explanation

When piston-to-cylinder clearance becomes excessive, blow-by increases because the sealing effectiveness decreases causing loss of combustion pressure, and affecting proper air-fuel mixture burn. Therefore, a reduced compression ratio results, with diminished engine efficiency, rather than oil degradation, high NOx emissions, or injector clogging, all from separately-triggered problems.

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