What is the Normal Cylinder Pressure for a Car Engine?

[DeLucy]

For gasoline engines, the cylinder pressure is generally between 8-11 bar, while for diesel engines, it is typically 12-16 bar. More related details are as follows: Gasoline Engine Cylinder Pressure Introduction: For a four-cylinder engine, a pressure of no less than 7 bar is considered normal. Cylinder pressure data varies by vehicle model. Generally, large vehicles (such as Dongfeng 140 and Jiefang 141) have normal pressures ranging from 6 to 8 kg, while small cars should have pressures above 8 kg. If the pressure is below the normal range, it can be concluded that the engine has a fault. Precautions for Gasoline Engine Cylinder Pressure: Carefully remove all spark plugs, as inspecting them can reveal many issues. Oily spark plugs indicate wear between the piston rings and cylinder walls or worn valve guides. Burnt spark plugs suggest vacuum leakage. Using a starter to rotate the engine too slowly may lead to incorrect results.