Technical data

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9
Intake air manifold
The S85 features a separate intake air
manifold for each cylinder bank that is
mounted with hose clips on the throttle valve
assemblies.
Cyclone separators are installed in the intake
air manifolds in the area of the fifth and tenth
cylinder. The oil from the oil separators and
the condensate from the manifolds merge in
two channels in the crankcase behind the
tenth cylinder and routed into the oil sump.
The design of the intake air manifold is similar
to that mounted on the S54. The shells are
also made from PA66 on the S85 but they are
joined together by a butt-welding process.
Intake silencers
The air to the intake silencers is drawn in via
two routes. One from the area behind the
kidney grille and the other from the large air
inlets in the bumper.
The S85 requires four air ducts in order to
achieve maximum output. A large cross
section could not be realized for package
space reasons. In addition, the upper intake
ducts define the fording capability of the M5.
In the US version, the air cleaner element is
additionally equipped with an activated carbon
filter. This filter serves the purpose of ensuring
no vapours containing hydrocarbons can
escape from the intake area into the
environment when the vehicle is stationary.
25 - Cyclone separator (1) in intake air manifold
26 - Intake silencers with air ducting