What causes engine knocking?

[Ted]

Engine knocking occurs due to the following reasons: 1. Carbon deposits in the combustion chamber; 2. Low octane rating of the fuel; 3. Incorrect ignition timing; 4. Overheating of the engine; 5. Incorrect air-fuel ratio. Solutions to engine knocking include: 1. Delaying the ignition timing; 2. Cleaning the fuel system and injectors; 3. Using qualified fuel additives; 4. Choosing fuel suitable for the engine's compression ratio; 5. Repairing or replacing the water pump. Engines are categorized by their working principles into piston engines, ramjet engines, rocket engines, and turbine engines. Their function is to convert thermal energy into mechanical energy by burning fuel in a sealed cylinder, causing the gas to expand and push the piston, thereby providing power to the vehicle.