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Which risk increases substantially when the quench area within an internal combustion engine's cylinder becomes excessively large?

A)Unburnt fuel escapes during combustion
B)Premature detonation damages piston crowns
C)Lubricant film breakdown accelerates wear
D)Exhaust valve temperatures exceed limits

💡 Explanation

Increased quench area can lead to incomplete combustion of the air-fuel mixture because of the `flame quenching` effect near the cylinder walls; therefore, unburnt fuel escapes into the exhaust, rather than fully combusting and increasing efficiency.

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