The 911 | Engine
911 Carrera 4S Cabriolet
VarioCam Plus System.
VarioCam Plus combines variable
valve timing with two-stage lift
on the inlet side. This results in
smoother running, better fuel
economy and lower exhaust
emissions. As well as greater top-
end power and low-end torque.
This two-in-one engine concept
seamlessly adapts in response
to driver input. The result: instant
acceleration and extremely
smooth running.
The variation in intake timing is
steplessly controlled by means
of an electro-hydraulic rotary
vane adjuster at the head of the
corresponding camshaft.
To improve throttle response
during the warm-up phase,
VarioCam Plus selects high valve
lifts with retarded valve timing.
In the middle and low load ranges,
low valve lifts with advanced
timing reduce fuel consumption
and exhaust emissions. High
valve lifts generate high torques
and maximum output.
Lightweight construction.
The advantages of an alloy engine
are its low weight and reduced
fuel consumption.
The intelligent engine design saves
even more weight, for example, by
fully integrating the camshaft
bearings into the cylinder heads.
Fuel economy has been further
improved by the effectively
designed oil supply system and
the low mechanical friction of
the engine.
