What are the consequences of not repairing engine knocking?

[McJocelyn]

Engine knocking will progressively worsen if left unrepaired, leading to reduced power and oil burning. Below is an expanded explanation of engine knocking: 1. Engine knocking, also known as detonation, is the most common abnormal combustion phenomenon in gasoline engines, often occurring under high compression ratios. When it happens, the engine produces a high-frequency metallic knocking sound. Mild detonation may slightly increase engine power, while severe cases result in decreased power and RPM, unstable operation, severe engine vibration, overheating, and black smoke emission. 2. The mechanism of detonation is complex. Simply put: during normal combustion, flames should propagate from the ignition center (spark plug) at 30-70m/s throughout the combustion chamber. Detonation occurs when multiple points in the cylinder ignite simultaneously (due to factors like carbon deposits or low-grade fuel) before the flame front arrives, causing sudden spikes in local pressure and temperature. The pressure waves oscillate at high frequencies within the cylinder, with flame propagation speeds reaching up to 1000m/s during severe detonation. An engine's optimal operating condition exists precisely at the edge of detonation.