How to check whether the automobile cylinder pressure is normal?

1, cylinder pressure gauge is required;

2. Then remove the cylinder spark plug;

3. Then, check the cylinder pressure of each cylinder at work and compare them. If the cylinder pressure difference between one cylinder and other cylinders is too large, it indicates a fault.

Automobile cylinder pressure:

The ratio of the maximum volume of the cylinder at bottom dead center to the minimum volume of the cylinder at top dead center is the compression ratio.

This is because: the increase of pressure can make the density of gas increase and the distance between molecules decrease, so that the distance between fuel molecules and oxygen molecules is closer and the combustion speed is faster; Temperature can make gas molecules move faster, fuel molecules and oxygen molecules interact more easily, and the mixed gas can be ignited more easily. Moreover, the smaller combustion space can complete combustion faster, the combustion process is accelerated, and the performance is also improved.

Reference materials? Baidu encyclopedia automobile compression ratio