What Does Engine Cylinder Knock Sound Like?
4 Answers
Engine cylinder knock produces a "clattering" sound, accompanied by symptoms such as insufficient power, weak acceleration, and abnormal engine noises. Below are relevant details about engine cylinder knock: 1. Overview: Engine cylinder knock occurs when excessive temperature inside the engine cylinder causes piston expansion, jamming it in the cylinder and preventing movement, thereby rendering the engine inoperable. Severe cases may lead to complete engine failure. 2. Causes: Multiple factors can cause engine cylinder knock, primarily including excessive engine temperature, engine overload operation, and lubrication system failure. 3. Excessive Engine Temperature: Prolonged engine operation or insufficient coolant can cause engine overheating, leading to piston expansion within the cylinder and resulting in cylinder knock. 4. Engine Overload Operation: The cause of cylinder knock due to engine overload is similar to that from excessive temperature, both stemming from piston expansion within the cylinder. 5. Lubrication System Failure: When the piston inside the cylinder lacks effective lubrication, friction can lead to cylinder knock.
The sound of an engine seizing is absolutely terrifying. I witnessed it firsthand on the track last time. It's like someone hammering the engine with an iron mallet - sudden sharp metallic banging noises accompanied by loud clanking sounds of parts breaking. The higher the RPM, the louder the noise, with the entire car body shaking violently and you can feel the steering wheel vibrating. This usually indicates problems with pistons or connecting rods, often caused by insufficient oil leading to poor lubrication and direct metal-on-metal friction. I immediately stopped the car and turned off the engine - continuing to drive could have completely destroyed the engine. I recommend fellow drivers to regularly check oil levels and maintain proper servicing, especially during summer when engines operate under high temperatures and heavy loads.
The sound of an engine blowout is terrifying, like a sudden explosion inside the motor. First, you hear a loud BANG, followed by the clattering sound of metal fragments colliding, somewhat resembling pouring nails into a washing machine drum. At this point, blue smoke will billow from under the hood, and the car immediately loses power—stepping on the gas pedal does nothing. I've experienced it myself, and it was especially dangerous since I was on the highway. Most cases are caused by cooling system failure or severe carbon buildup. Once you hear this sound, remember to immediately turn on your hazard lights and pull over—never attempt to restart the engine. The repair costs for this kind of failure are extremely high, sometimes requiring a complete engine replacement.
Engine knocking produces a continuous metallic knocking sound, crackling like firecrackers. The sound frequency is extremely fast, accompanied by a buzzing resonance vibration, which can be clearly felt inside the cabin. Common causes include oil pump failure or piston ring breakage, where metal components lack lubrication and directly rub against each other. The car may experience jerking, and white smoke may come out of the exhaust pipe. In such cases, the engine must be shut off immediately, or else debris could penetrate the cylinder block. It is recommended to regularly change the oil and filter, especially for older vehicles.
