What Causes the Engine Noise to Increase?
2 Answers
Car engine noise increases due to the following reasons: 1. The engine oil does not meet the standard or is overfilled, increasing the stirring resistance of the crankshaft connecting rod; 2. The viscosity of the engine oil is unsuitable; 3. Excessive carbon deposits in the engine, which aggravate the wear of the cylinder and piston; 4. Mixing different brands of engine oil; 5. Not changing the engine oil on time. An engine is a machine that can convert other forms of energy into mechanical energy. It is divided into: 1. Internal combustion engine: Fuel burns inside the engine; 2. External combustion engine: Fuel burns outside the engine; 3. Gas turbine: Combustion produces high-pressure gas, and the high-pressure gas is used to push the turbine blades to rotate; 4. Jet engine: An engine that directly generates reactive thrust by the high-speed airflow ejected from the nozzle.
As an experienced mechanic, I've seen it all. The most common cause of increased engine noise is oil-related issues – either overdue for a change or using low-quality oil, leading to insufficient lubrication and knocking sounds from components. Exhaust leaks are another culprit, especially in older vehicles where worn gaskets create popping noises. Keep an eye on belts too; after 70,000-80,000 km, misaligned tensioners can produce high-pitched squeals. Worn engine mounts are particularly annoying, causing loud thumping over speed bumps. A lesser-known reason is excessive carbon buildup in combustion chambers – you'll hear clicking during hard acceleration when valves struggle to operate. My advice? Regularly inspect these areas before minor issues escalate into major repairs.
