BMW S58, Руководство пользователя

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S58�Engine
7.�Oil�Supply
37
7.1.�Differences�in�the�oil�supply
• Sump�with�a�small�front�oil�sump�as�a�volume�buffer
• Aluminium�frame�with�oil�extraction�pipes�and�ducts�bolted�to�the�crankcase
• Plastic�cover�with�integrated�gasket�for�better�separation�of�the�front�and�rear�sump�partitions
• Oil�pump�as�external�gear�pump�with�map�control
• Additional�twin�oil�return�pumps
• Two�oil�spray�nozzles�per�cylinder,�plus�one�switchable�nozzle
• Centrally�controllable�piston�cooling�via�oil�spray�nozzles.
7.2.�Oil�supply�adaptations
The�controlled-volumetric-flow�pendulum�vane�pump�familiar�from�the�B58TU�engine�is�not�used
on�the�S58�engine.�The�reason�for�this�is�that�the�S58�engine�has�an�additional�suction�pump�for�the
front�oil�sump.�With�the�same�concept�involving�a�volume-flow-controlled�pendulum-slide�pump,�this
would�have�been�too�large�for�the�limited�packaging�space.�In�addition,�the�volume-flow-controlled
pendulum-slide�pump�used�in�the�B58TU�engine�would�not�have�been�capable�of�providing�a�reliable
oil�supply�in�the�high�engine�speed�ranges�that�occur�in�the�S58�engine.
Therefore,�a�spur-gear�pump�with�integrated�twin�oil�return�pump,�which�is�also�a�spur-gear�pump,�is
used�on�the�S58�engine.�This�combination�is�more�compact�at�a�higher�delivery�rate�than�the�volume-
flow-controlled�pendulum-slide�pump.
The�external�gear�pump�is�volume-flow-controlled�and�is�supplemented�by�a�map�control.
Bolted�onto�the�intake�side�of�the�crankcase�is�the�oil�filter�module.�The�oil�pressure�sensor,�the�oil
temperature�sensor�and�the�data-map�control�valve�for�the�data-map�controlled�oil�pump�are�bolted�to
the�crankcase�behind�the�oil�filter�module.
The�sump�has�a�silicon�sealant�coating�and�is�bolted�to�the�crankcase.�The�sump�is�made�of�die-cast
aluminium�and�holds�the�oil�level�sensor�and�the�oil�drain�plug.
The�position�and�length�of�the�oil�pump�intake�snorkel�has�been�adapted�to�the�geometric�shape�of�the
oil�pump.�An�additional�twin�oil�return�pump�is�flange-mounted�on�the�oil�pump.�This�was�necessary�in
order�to�adapt�the�oil�supply�to�racetrack�use.�This�ensures�a�secure�oil�supply,�even�when�the�oil�level
is�displaced�during�lateral�and�longitudinal�accelerations,�as�can�occur�during�racing�applications.