Porsche PANAMERA 4S Brochure page 20

A sense of relaxation is felt especially after a period of intense pressure.
Direct fuel injection (DFI).
With millisecond precision, effective combustion. At up to
DFI injects fuel at up to 120 bar 3,500 rpm, the engine operates
directly into the combustion with dual injection for faster heat-
chamber by means of electro- ing of the catalytic converters
magnetically actuated injection after a cold start and for greater
valves. torque in the upper load range.
The spray and cone angles have DFI improves the internal cooling
been optimised for torque, power of the combustion chamber
output, fuel consumption and by having the mixture prepared
emissions by enabling a homo- directly in the cylinder. This
geneous distribution of the air/ allows for a higher compression
fuel mixture, and, therefore, ratio, which helps to deliver more
output at the same time as
enhanced engine efficiency.
Injection is regulated by the
electronic engine management
system and emissions are
monitored by the stereo lambda
sensors, thus helping to protect
the environment.
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VarioCam Plus.
VarioCam Plus is a two-in-one
engine concept for adjusting the
intake camshafts and switching
the lift of the intake valves.
The system first differentiates
between driver inputs that
typify normal, everyday driving
and those inputs that demand
maximum performance. The
electronic engine management
system then seamlessly adapts
valve operation to the prevailing
conditions. This results in instant
acceleration and extremely
smooth running.
In the middle and low load ranges,
The valve lift adjustment system low valve lifts with advanced
comprises a series of selectable timing reduce fuel consumption
bucket tappets, which are control- and exhaust emissions and
led by an electro-hydraulic switch improve smooth running. The
valve. The continuously variable increase in fuel economy is
intake timing is controlled by a particularly pronounced in the
lightweight camshaft controller lower engine speed range. High
made of solid aluminium. torque and maximum output
are achieved through high valve
lifts and advanced timing.
Performance
VarioCam Plus
How does this benefit you?
Extraordinary power with
relatively low fuel consumption.
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| Engine