What are the causes of low cylinder compression pressure?

[McHaley]

Cylinder compression pressure being too low is mainly caused by air leakage between the cylinder head and the cylinder. Here is some related information about cylinder compression: 1. Compression ratio: The engine compression ratio refers to the degree to which the engine's air-fuel mixture is compressed, expressed as the ratio of the total cylinder volume before compression to the cylinder volume after compression (i.e., the combustion chamber volume). 2. Cylinder function: The cylinder is a cylindrical metal component that guides the piston to perform linear reciprocating motion inside it. In an engine cylinder, air converts thermal energy into mechanical energy through expansion; in a compressor cylinder, gas receives compression from the piston to increase pressure.

[DelSteven]

I've seen low cylinder compression pressure many times. When repairing cars, the most common causes are severe piston ring wear causing air leakage, and poor valve sealing, such as valve seat erosion or improper valve clearance leading to incomplete closure. A leaking cylinder head gasket due to aging can also cause pressure drop, which is a major hazard affecting engine power, increasing fuel consumption, and even making the car difficult to start. Additionally, cylinder wall wear or scratches can reduce compression efficiency. Don't forget issues like timing chain misalignment, which can cause valve timing disorder. It's recommended to first use a compression tester to measure each cylinder's data and compare it with normal values. If the deviation is large, take it to a professional shop for inspection and parts replacement, rather than waiting for the problem to worsen and cost more.

[Manuel]

Friend, low cylinder compression can be really annoying! The root causes are often piston ring wear causing air leakage, or valves not sealing properly leading to compression failure. Timing issues like a skipped timing chain can also disrupt the compression process, and a leaking head gasket is another common culprit. These problems can make the engine shake violently, lose acceleration power, and burn more fuel. You can start by listening for abnormal idle sounds or using a simple pressure gauge for testing, but for complex issues, it's better to let a mechanic handle it to avoid making things worse. Regular engine maintenance can prevent these issues, especially if you frequently drive long distances, to avoid sudden breakdowns that could ruin your safe and enjoyable trip.

[OMalachi]

Low compression pressure? Common causes include excessive piston ring wear leading to air leakage, poor valve sealing due to burning or erosion, or cylinder gasket cracking and leakage. These faults directly affect engine performance and increase fuel consumption. During inspection, use tools to measure each cylinder; if the differences are too large, proceed with repairs and timely part replacement to save money and effort without disrupting daily work routines. It's recommended to pay attention to regular engine maintenance to avoid minor issues escalating into major faults that could delay trips and reduce productivity.