consistently within a specific
temperature range. The engines
in the new Cayenne models are
therefore designed for optimum
cooling.
The V8 engines have an enhanced
coolant management system
offering effective temperature
control throughout the engine.
While 20% of coolant flows longi
tudinally through the crankcase,
the remaining 80% serves the
cylinder heads using the proven
cross flow principle (from hot to
cold).
On all Cayenne models, the piston
heads are cooled using oil spray
jets integrated within the main
lubrication system. In addition,
thermal management ensures
that the optimum operating tem
perature for the engines is
reached more quickly. This keeps emissions and fuel consumption
low, even when starting from cold.
The entire cooling system is
designed for prolonged heav y
dut y use, e.g. of f road driving
or heav y towing and carrying
applications.
Lubrication.
The V8 engines use dry sump
lubrication to ensure a consistent
supply of oil in all load conditions,
especially in of f road terrain.
The oil reservoir is located inside
the engine. This saves on space
and reduces weight.
Oil is circulated around the V8
engines using a demand driven
pump. This has been designed for the toughest driving scenarios
on and off road, including per
formance driving and extreme
gradients.
The V6 engine in the Cayenne has
a wet sump lubrication system.
Ensuring a reliable supply of oil,
no mat ter how challenging the
driving conditions.
Direct fuel injection on the
diesel engine (common-rail
injection system).
On the Cayenne Diesel, direct
fuel injection comes courtesy of
a common rail injection system.
The injection pressure of up
to 1,800 bar ensures optimum
distribution of the air/fuel mixture
– for greater performance. The
piezoelectric injection valves
provide flexible injection rate
adjustment, using exactly metered
quantities of fuel, with multiple
injections for each power stroke
to deliver smooth combustion.
Cooling systems.
A high performance engine can
only maintain its maximum
capabilit y over a long service life
if all components are operating
Direct fuel injection (DFI).
DFI injects fuel directly into the
combustion chamber at up to
120 bar with millisecond precision
using electromagnetic injectors.
The injector position and spray
geometry have been carefully
designed to improve output,
torque, fuel economy and emis
sions. The swirling of the fuel as
it enters each chamber increases
the mixing of air and fuel, thereby
enhancing combustion. By form
ing the air/fuel mixture directly
in the combustion chamber, DFI
contributes to engine cooling.
As a result, it was possible to in
crease the compression ratio and
therefore power and efficiency.
Compression with precision.
Essential for getting right to the point.
38 · Drive systems and chassis | Engine technology
of the car’s dynamic exterior
lines. The seat position and
three spoke steering wheel of fer
exceptional support and contact
– for an even sportier ride. A t ypical Porsche feature, yet
totally new on the Cayenne: the
five round instruments now form
the familiar cluster and are slight
ly raised from the dashboard as
a visual unit. The high resolution
4.8 inch TFT colour screen
displays information from the on
board computer or, in conjunction
with PCM including navigation
module, map data from the navi
gation system. It also shows the
set tings of the optional adaptive
cruise control or gives various
warnings, such as alerts from Tyre
Pressure Monitoring (TPM), which
is also available as an option. On the new Cayenne S Hybrid, the
display also provides information
about the energy management.
Oil pressure, oil and coolant
temperature as well as the fuel
level are displayed using analogue
gauges, while the boost pressure
gauge on the new Cayenne Turbo
is digital. A compass display in
the instrument cluster is available
as an option in conjunction with
PCM. This shows the four cardinal
and four ordinal directions with
degree increments as well as your
current altitude.
The steering column offers man
ual height and reach adjustment
(electrically adjustable on the
new Cayenne Turbo). The steering
wheel rim is in smooth
finish
leather. As is the optional three
spoke sports steering wheel with
gearshif t paddles – for genuine
race st yle gearshif t action. Also
available as an option, the three
spoke multifunction steering
wheel enables easy access to
a range of functions including
audio and telephone.
Particularly striking features in
clude the way the centre console
rises to meet the dashboard –
clearly inspired by the Carrera GT.
This immediately enhances the
interior structure, a continuation
As on every Porsche, the interior
of the new Cayenne is designed
around the driver, combining
sporting st yle with the very high
est standards of ergonomics,
comfort and qualit y.
Déjà vu, yet totally new.
Comfort.
Cayenne Turbo with walnut interior package in t wo tone combination (Umber/Cream)
Comfort and transport | Comfort · 79
78 · Comfort and transport | Comfor t
