Which risk increases when variable valve timing (VVT) adjustment aggressively alters piston-cylinder compression ratios?

💡 Explanation

Detonation risk increases; the rapid advancement of valve timing concentrates the air-fuel mixture causing spontaneous ignition due to compression ignition, or detonation. The uncontrolled combustion leads to increased cylinder pressures and potential structural damage. Therefore, detonation-induced piston damage will occur rather than other exhaust anomalies.

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