Audi 4.2-litre V8 FSI, Service Training

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Oil circulation system
Sump in the Audi RS4
Especially in a sports car, a reliable supply of oil in
all driving situations is vitally important. The oil
supply system in the high-revving engine was
designed for racing applications in which it is
subjected to lateral acceleration of up to 1.4 g.
To ensure this, the sump in the RS4 has an
additional system of flaps.
Design
Four flaps whose axis of rotation is parallel to the
longitudinal axis of vehicle are arranged inside a
housing. Each of the flaps opens towards the inside
of the intake end of the oil pump.
Function
When the vehicle is cornering the oil flows inside
the sump towards the outside of the corner. The two
flaps facing the outside of the corner close and hold
the oil in the sump intake.
At the same time, the two flaps facing the inside of
the corner open to allow additional oil to flow into
the intake. This ensures a sufficient supply of oil to
the oil pump.
Direction of travel
Flap opens
(oil flows into intermediate chamber) Flap closes
(oil back pressure is increased)
to outside of corner
acting centrifugal forces
Cutaway view A