GF07.61-P-3028CY Intake Manifold Switchover, Function

GF07.61-P-3028CY Intake Manifold Switchover, Function
- up to model year 08


With the intake manifold switchover, switching between a long and a short intake route is possible. In this way the torque development is optimized.

For this purpose, a longitudinal switch flap is located in the variable intake manifold for each cylinder.

The individual intake manifolds, each approx. 800 mm long, are arranged in a spiral shape around the air collecting volume. Each single intake manifold has an opening to the air collecting volume somewhere in the middle. These opening can be opened or closed by rotating longitudinal switch flap shafts. The length switch flaps of a cylinder bank are interconnected by a shaft and each of the flap is actuated by a vacuum unit.

Both vacuum units for the intake manifold switchover are connected via hose pipes to the variable intake manifold switchover valve.(Y32)

Open the length switch flaps without actuation through spring force and release the short intake route.

Short intake route (section at cylinder level)

Component Identification:

At engine speeds >3500 rpm and an engine load >50%, the intake manifold switchover vacuum unit is ventilated and the length switch flap is opened by spring force.
The intake air takes the short intake route. Thus an increase in engine torque and power output is achieved.

Long intake route (section at cylinder level)

Component Identification:

At engine speeds <3500 rpm the intake manifold switchover vacuum unit has vacuum applied to it and the length switch flaps are closed. The intake air takes the long intake route.
The result is an improved cylinder charge and thus an increase in engine torque.