19
The rockers are made of die-cast aluminium
in order to keep inertia forces as low as
possible. As a result, the valvegear is able to
function reliably at engine speeds of up to
7200 rpm.
The use of roller rockers has not only meant a
considerable reduction in frictional losses in
the valvegear, but has also halved the oil
delivery rate in the cylinder heads. This also
has a positive effect on the degree of
efficiency.
Five-valve technology is now also being used
in the V8 engines.
Roller rockers are being used for the first time
in the enhanced five-valve cylinder head.
This considerably reduces frictional losses in
the valvegear which, in turn, significantly
improves efficiency.
SSP217_020
Cylinder head
Five-valve technology
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