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<b>Fig. 2</b><br>Air flowing through the main venturi is dictated by the pressure drop caused by the engine's suction (P1). The air flowing through the booster is dictated by the much greater pressure drop occurring at the minor diameter of the main venturi (P2). This brings about a much higher pressure drop and velocity at P3.
Booster Science

 Fig. 2
Air flowing through the main venturi is dictated by the pressure drop caused by the engine's suction (P1). The air flowing through the booster is dictated by the much greater pressure drop occurring at the minor diameter of the main venturi (P2). This brings about a much higher pressure drop and velocity at P3.  View Related Article

 

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