Intake Manifold Design

Shown on engine 112

The intake manifold is composed of several magnesium die-castings. When assembled this results in individual intake manifolds and the air collecting volume. The parts are sealed to each other by plastic. The intake manifold cannot be disassembled.

The approximately 800 mm long individual intake manifolds are arranged in a spiral shape around the air collecting volume. An individual intake manifold is assigned to each cylinder.

Each individual intake manifold has a wider opening to the air collecting volume in the middle. These openings can be opened or closed by the control flaps which pivot through approx. 60°.

The control flaps are bolted onto steel shafts. One shaft is installed for each bank of cylinders. The interlinked flap shafts are closed by the intake manifold switchover diaphragm unit by means of vacuum.

When the variable intake manifold switchover valve is open, the vacuum is supplied from a vacuum reservoir with check valve in the intake manifold. The storage volume is designed for about 5 operations without renewed evacuation.

The control flaps open by spring pressure.