What Sound Does Engine Piston Slap Make?

[MacRuby]

Engine piston slap is a crisp, rhythmic metallic knocking sound that varies with temperature changes. It is an abnormal phenomenon that requires immediate inspection and repair once detected. The piston slap sound becomes more pronounced at lower engine temperatures and diminishes as the temperature rises. Possible causes of engine piston slap include poor lubrication, low oil pressure, or insufficient oil viscosity. An engine is a machine that converts other forms of energy into mechanical energy, originating in England. It can refer either to the power generation device or the entire machine including the power unit (such as gasoline engines, aircraft engines). Engine types include internal combustion engines (e.g., gasoline engines), external combustion engines (e.g., Stirling engines, steam engines), and electric motors.