Which outcome occurs when an internal combustion engine piston approaches top dead center with excessive carbon accumulation?

💡 Explanation

When the piston approaches TDC with carbon buildup, autoignition occurs because the carbon deposits retain heat. This creates hot spots in the cylinder that ignite the air-fuel mixture before the spark, leading to premature detonation. Therefore, premature detonation results, rather than bending; efficiency drop or burning, which require different failure mechanisms.

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