What is the intake manifold pressure?

1 Answers
VincentAnn
07/29/25 11:43pm
Intake manifold pressure is normally between 40 and 80 kPa. When the engine is running, during the intake stroke, the downward movement of the piston creates a suction effect, causing the intake manifold pressure to be lower than atmospheric pressure. The intake manifold is usually made of plastic. Since PA has lower thermal conductivity than aluminum, the fuel injectors and incoming air temperature are lower. The main factors affecting intake manifold pressure are as follows: 1. Throttle opening: The smaller the throttle opening, the greater the suction effect created by the piston during intake, resulting in higher vacuum suction in the intake manifold, meaning lower intake manifold pressure. 2. Sealing performance: This includes the sealing of the intake manifold and cylinders. Better sealing performance leads to a greater suction effect created by the piston during intake, resulting in higher vacuum suction in the intake manifold, meaning lower intake manifold pressure.
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