What is the normal cylinder pressure value?

[McAriana]

The normal cylinder pressure value should not be lower than 700KPa. The following are the inspection and effects of normal cylinder pressure: Inspection of normal cylinder pressure: The simplest way to check cylinder pressure is to verify whether the four cylinders have the same pressure. If one cylinder's pressure differs from the others, it indicates that this cylinder is not functioning properly. Effects of normal cylinder pressure: Cylinder pressure refers to the compression pressure size when the piston reaches the top dead center at the end of compression. Insufficient cylinder pressure will lead to decreased combustion efficiency, insufficient power, increased fuel consumption, and excessive engine temperature; increased carbon deposits, severe engine shaking; lubricating oil entering the cylinder, causing oil burning; black smoke from the exhaust pipe, reduced engine lifespan, and premature vehicle scrapping.

[DiRafael]

When discussing engine cylinder compression, the normal range for gasoline engines is typically between 120 and 180 psi, depending on the specific model and compression ratio. From my past measurements, if the readings are stable within this range, it indicates a healthy engine. The measurement method involves inserting a compression gauge into the spark plug hole and cranking the engine for a few seconds to obtain the reading. It's recommended to perform the test when the engine is cold for more accurate results. If the pressure is below 120 psi, it might be due to worn piston rings or valve leakage; readings above 180 psi could indicate carbon buildup or modification issues. The compression difference between cylinders should not exceed 15 psi, otherwise, the engine may experience shaking. Regularly checking cylinder compression can prevent major overhauls. Spending just 5 minutes on this test during each maintenance session is a worthwhile investment, as the engine is the core component of the vehicle—proper maintenance can save fuel and extend its lifespan. Diesel engines normally have higher compression, starting at least from 300 psi, due to their different compression ratios.

[Eugene]

When I work on cars, I often check cylinder compression. For gasoline engines, the normal value is around 140 psi. If it's too low, it indicates poor compression, possibly due to bad piston rings or air leaks. To measure, screw the compression tester into the spark plug hole and start the engine to read the value—avoid doing this when the engine is hot as temperature greatly affects readings. If it's below 110 psi, you'll need to repair the valves or head gasket. Significant variation between cylinders can cause engine instability. Regularly monitor oil condition to reduce wear—proper compression ensures smooth operation and fuel efficiency. Diesel engines require over 300 psi but follow similar principles; just ensure tools are clean for accurate readings. Testing every 20,000 km is practical for preventing minor issues from becoming major problems.

[ThomasRose]

Normal cylinder pressure for gasoline cars is 120-180 psi. When measuring, connect the gauge to the spark plug hole, start the engine and read the value. Cold engine readings are more accurate. Low pressure may indicate piston ring or valve leaks; high pressure could be due to carbon buildup. Smaller pressure differences result in quieter engine operation. Regular checks can identify potential issues, allowing for timely repairs.