Which outcome occurs when piston-ring-groove wear exposes automotive pistons to excessive combustion pressure?

💡 Explanation

Increased hydrocarbon blow-by results from the damaged seal. The mechanism is reduced compression sealing, because the combustion's hot gases bypass damaged piston rings. Therefore, pressure leaks into the crankcase, rather than combustion being entirely contained, limiting pressure on the piston head to drive the crankshaft.

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