7
Cylinder head
The cylinder heads are largely identical to
those used in the V6 naturally aspirated
engine. Common parts are used for both banks
of cylinders.
The mounting position of the right-hand
cylinder head is rotated through an angle of
180° in relation to the left-hand cylinder head.
The timing of the inlet camshafts is engine-
dependent.
To improve heat dissipation, the exhaust
valves are sodium-filled.
The shape of the inlet duct causes the drawn-
in air to tumble.
Advantages:
•
A good degree of swirl and high ignitability
fuel-air mixture are achieved
•
The tumble effect allows more efficient
combustion
For a turbocharged engine, the compression
ratio of 9.3 : 1 is high.
Advantage:
•
High ”basic torque level“ and fuel
economy
Tumble duct
In combination with five-valve-
per-cylinder technology, the inlet
duct is shaped as a so-called
“tumble duct“.
Tumble duct
Tumble effect
SSP 198/78
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