What are the hazards of engine knocking?
2 Answers
Engine knocking mainly has the following hazards: 1. Decreased engine power, increased temperature, increased load and wear on internal engine components, and increased formation of carbon deposits inside the engine. 2. Internal engine components deform due to increased temperature, and the amount of heat carried away by the coolant increases. The following are the causes of knocking: 1. During the compression stroke of the engine piston, the engine ignites and explodes before the piston reaches the top dead center. 2. The quality of the fuel is too low to meet the required compression ratio inside the cylinder, causing the fuel to self-ignite and explode before the piston reaches the top dead center of the stroke.
When test-driving Lao Wang's modified car the other day, I heard a 'knock knock' detonation sound as soon as I stepped on the gas. This engine knocking is no trivial matter—it can make your engine components retire early. Specifically, those abnormal combustion shockwaves repeatedly hammer the piston crown. Over time, the piston rings may deform and leak, and the cylinder walls could get scratched. Even worse, the connecting rod bearings can get shaken loose—my friend's car needed a complete overhaul kit last time because of this. Detonation also generates abnormal high temperatures that can burn the valve edges and easily clog the catalytic converter. These component failures aren't fixable with just a few hundred bucks—you might end up needing a full engine rebuild.
