What are the reasons for engine acceleration difficulties and abnormal noises?

[LaLorenzo]

Engine acceleration difficulties and abnormal noises are caused by: 1. Engine misfire or knocking; 2. Dirty or poor-quality engine oil; 3. Loose connecting rod bearings and crankshaft bearings, melted bearing shells, or improper dimensions during rotation. The function of an engine is: to convert the thermal energy of gasoline into mechanical energy by expanding gas through combustion in a sealed cylinder to push the piston and perform work, thereby providing power for the vehicle. Engines can be used as power generation devices or refer to the entire machine including the power unit (such as gasoline engines, aircraft engines). Their types include internal combustion engines (such as gasoline engines), external combustion engines (such as Stirling engines, steam engines), gas turbines (used in racing cars), electric motors, etc.