Anyone ever heard of this?
Motor Sound System (MSS)
The Motor Sound System is a membrane system for modulating and transmitting the intake
system pressure pulses to the passenger compartment. This generates a sporting sound
that is typical of a roadster.
In this market segment, BMW is the first manufacturer to deliberately transmit pressure
pulses from the intake system to generate sound in the passenger compartment. The MSS
is only installed on the M54B30 engine.
The sound generator is connected by a membrane (2) to the column of air in the intake
manifold. The pressure pulse is transmitted into the passenger compartment via this membrane,
which also ensures a “sealed” intake system.
A clamping mechanism ensures a constant preload on the membrane for even acoustics,
balancing out temperature and material aging influences on the membrane. The tensioning
spring (4) generates an axial motion of the plunger (3) by turning the rotating element (5).
The plunger continuously tensions the membrane.
Note: There are foam inserts in the sound channel (7). These must not be removed during
repairs, because the noise generated in the vehicle interior will increases to an unacceptable
level.
Motor Sound System (MSS)
The Motor Sound System is a membrane system for modulating and transmitting the intake
system pressure pulses to the passenger compartment. This generates a sporting sound
that is typical of a roadster.
In this market segment, BMW is the first manufacturer to deliberately transmit pressure
pulses from the intake system to generate sound in the passenger compartment. The MSS
is only installed on the M54B30 engine.
The sound generator is connected by a membrane (2) to the column of air in the intake
manifold. The pressure pulse is transmitted into the passenger compartment via this membrane,
which also ensures a “sealed” intake system.
A clamping mechanism ensures a constant preload on the membrane for even acoustics,
balancing out temperature and material aging influences on the membrane. The tensioning
spring (4) generates an axial motion of the plunger (3) by turning the rotating element (5).
The plunger continuously tensions the membrane.
Note: There are foam inserts in the sound channel (7). These must not be removed during
repairs, because the noise generated in the vehicle interior will increases to an unacceptable
level.
