Which risk increases when excessive cylinder bore distortion occurs in an internal combustion engine?

💡 Explanation

When cylinder bore distorts significantly, piston rings cannot maintain a consistent seal against the cylinder wall therefore the 'piston ring blow-by' occurs because high-pressure combustion gases leak into the crankcase. Therefore, increased piston ring blow-by happens, rather than valve float, clogging, or seizure, which require different mechanical failures.

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