Why is the Buick Excelle so noisy?

[Monica]

The main source of noise in the Buick Excelle is engine noise. Common methods to reduce noise include replacing with higher-quality engine oil, using intake ducts with sound insulation, wrapping the exhaust and cylinder head with soundproofing materials, and the simplest method is adding sound insulation to the engine cover. Below is relevant information about engines: 1. Introduction: An engine is a machine capable of converting non-mechanical energy into mechanical energy. 2. Classification: Includes internal combustion engines (reciprocating piston engines), external combustion engines (such as Stirling engines, steam engines, etc.), jet engines, electric motors, etc. 3. External combustion engines: These are engines where fuel is burned outside the engine. 4. Internal combustion engines: Reciprocating piston engines, the main difference from external combustion engines being that fuel is burned inside them. There are many types of internal combustion engines, with common gasoline and diesel engines being typical examples.