Intake Manifold, Design

Intake Manifold, Design




Shown on ENGINE 112
12a Top part of intake manifold
12b Bottom part of intake manifold
12c Top intake manifold insert
12d Bottom intake manifold insert
22 Variable flaps
22/1 Variable intake manifold switchover diaphragm unit
22/2 Flap shafts
22/3 Connecting link
M16/6 Throttle valve actuator
Y22/6 Variable intake manifold switchover valve
a Hose line to intake manifold switchover aneroid capsule
b Hose line to variable intake manifold switchover valve
C Direction of travel

The intake manifold is assembled out of several magnesium pressure castings. When fitted together, they produce the individual intake manifolds and the air collecting volume. The parts are sealed off to each other by plastic. The intake manifold cannot be disassembled.

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

Each single intake manifold has a further opening to the air collecting volume in the middle. These can be opened or closed by means of variable flaps which pivot through approx. 60°.

The variable flaps are attached to steel shafts. One shaft is installed for each bank of cylinders. The interconnected flap shafts are closed by means of vacuum by the intake manifold switchover diaphragm unit.

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 reservoir volume is designed for about 5 operations without renewed evacuation.

The variable flaps open by means of spring force.