What is the normal absolute pressure of the automobile intake pipe?

The normal value of absolute pressure of automobile intake manifold is generally between 40-80kPa. When the engine is working, the intake manifold pressure will be lower than the atmospheric pressure due to the suction force generated by the downward movement of the piston in the intake stroke. The intake manifold is located between the throttle valve and the intake valve of the engine. After the air enters the throttle and passes through the manifold buffer system, the air flow path branches here to introduce the air into each cylinder respectively.

There are three main factors that affect the intake manifold pressure:

1. Throttle opening: The smaller the throttle opening, the greater the suction effect of the piston during intake, and the greater the vacuum suction of the intake manifold, that is, the lower the intake manifold pressure.

2. Engine speed: The higher the engine speed, the greater the suction effect of the piston and the greater the vacuum suction of the intake manifold, that is, the lower the intake manifold pressure.

3. Sealing performance: including the sealing of intake manifold and cylinder. The better the sealing performance, the greater the suction effect of the piston and the greater the vacuum suction of the intake manifold, that is, the lower the pressure of the intake manifold. Million car purchase subsidy