THE EVENTURI INTAKE SYSTEM BMW, BMW M, BMW PLUG-IN HYBRID, BMW MILD HYBRID CARS
The Eventuri for BMW, BMW M, BMW Plug-in Hybrid and BMW Mild Hybrid cara is a new type of intake design, which has been granted a patent. Eventuri uses a cone filter – but here it is inverted and decoupled from the inlet tube. By removing the direct connection between the filter and the inlet tube, the filter is no longer dictating the shape of the airflow. This is now being done by the carbon housing, which is designed to smoothly guide the air into the inlet tube without a sudden change in geometry.
This means that Eventuri keeps laminar conditions throughout the intake, which is a lot more efficient. Furthermore, the funnel-shaped housing invokes the Venturi effect where the smooth reduction in cross-sectional area along the length of the housing causes the airflow to increase in velocity. Essentially the entire housing acts as a large velocity stack. On the road this translates to more power with a smoother delivery as well as sharper throttle response since the airflow is not inhibited by abrupt geometry changes.
The diagram above shows an Eventuri intake system using a reverse mounted filter inside an Eventuri housing. The large velocity stack area is highlighted in yellow.