What are the manifestations and causes of engine knocking?

[LeMakayla]

Manifestations of engine knocking: You can clearly feel abnormal engine noise and vibration, which reduces engine output power, increases temperature, and raises fuel consumption. The specific reasons are as follows: 1. Excessive carbon deposits in the engine combustion chamber: Excessive carbon deposits in the engine combustion chamber not only increase the compression ratio (generating high pressure) but also create high-temperature hot spots or sparks on the carbon deposits, leading to engine knocking. 2. Overheating of the engine: If the engine operates in an excessively hot environment, causing high intake air temperature, or if the engine cooling water circulation is poor, it can result in engine overheating and knocking. 3. Low octane rating of the fuel: The higher the fuel grade, the stronger its anti-knock performance. Engines with high compression ratios have higher pressure in the combustion chamber. If fuel with low anti-knock performance is used, knocking is more likely to occur.