2009 PORSCHE 911 ignition

1
18
3
21
10
14
9
4
15
17
22
19
20
7
16
11
2
5
6
8
13
12 1. Crankshaft
2. Forged connecting rods
3. Forged aluminium pistons
4. Cylinder track
5. Camshaf t drive chain
6. Cam adjuster
7. Intake camshaf t
8. Switch tappets
9. Valves with valve springs
10. High pressure fuel rail
11. High pressure injectors
12. Individual ignition coils
13. Spark plugs
14. Air filter housing
15. Exhaust turbocharger with
variable turbine geometr y
16. Intercoolers
17. Pressure pipe
18. Throt tle valve
19. Expansion intake manifold
20. Cataly tic converters
21. Exhaust system
22. Oil filter
Lightweight design.
An alloy engine means less weight
and consequently reduced fuel
consumption. The intelligent
engine design also saves weight.
The alloy crankcase is divided
vertically, with the cylinders
integrated into the crankcase.
Forged connecting rods are used.
For optimum durabilit y, we’ve
used forged aluminium pistons
running in cylinders made from
an aluminium/silicon alloy and
cooled via individual oil-spray jets.
Integrating the camshaf t bearing
system fully into the cylinder
heads has also saved weight. The
subsequent low levels of engine
friction and the ef ficient design of the oil supply system have helped
to reduce fuel consumption even
further.

Performance
| Engine
Engine with air filter housing with a carbon -weave finish in the new 911 Turbo S models
911 Turbo engine
· 34 ·· 35 ·

VarioCam Plus.
VarioCam Plus is a variable valve
timing system on the inlet side
which also features t wo -stage
valve lift. For excellent smooth-
running performance, bet ter fuel
economy and fewer emissions.
And greater power and torque.
The timing of each valve is step-
lessly and electro -hydraulically
controlled by means of a rotary
vane adjuster.
For optimum responsiveness
during the warm-up phase,
VarioCam Plus will select the
higher valve lif t set ting and retard
valve timing. At medium revs
and low engine loads, the lower
valve lif t set ting is selected
and timing advanced in order to
reduce fuel consumption and
emissions. For maximum power
and torque, the higher lif t set ting
is selected and the timing of the
valves is advanced.
Engine management.
The EMS SDI 3.1 engine manage -
ment system ensures optimum
performance at all times.
It is responsible for all engine-
related functions and assemblies,
resulting in improved fuel
economy, emission levels and
performance, regardless of
driving st yle.
Another important task performed
by the engine management
system is cylinder-specific knock
control. Since conditions tend
to vary across the engine, each
cylinder is monitored separately.
If a risk is detected, the individual
ignition timing is adjusted to
protect the cylinders and pistons
at high engine speeds and loads.
The EU-compliant on-board
diagnostics system provides

continuous fault detection as well as early warning for the exhaust
and fuel supply systems. This
actively reduces harmful emissions
while maintaining consistent rates
of fuel consumption.
Ignition system.
The ignition system is a static
high-voltage system. Each indi -
vidual spark plug has a separate
ignition coil, ensuring perfect
combustion every time.
Performance | Engine
VarioCam Plus
· 38 ·· 39 ·

Expansion intake manifold.
More power for less fuel. What
sounds absurd is sometimes
quite simple. You just have to
have the nerve to question
prin ciples that are seemingly
writ ten in stone.
The 911 Turbo and 911 Turbo S
models have an innovative expan -
sion intake manifold that was
used for the first time on the latest
911 GT2. Its unique operating
principle is unlike any thing ever
featured on existing induction
systems. Our ‘expansion’ intake
manifold is a radical development
that is the polar opposite of the
resonance principle used on con -
ventional turbocharged engines.
A resonance manifold increases
engine output by forcing addi
tional
air into the combustion chambers.
To do this, the manifold is designed
in such a way that the air – which
vibrates due to the action of the
valves – is in a compression phase
as it passes through the inlet ports.
Unfortunately, compression not
only increases air volume, it
also increases air temperature
and this has a negative effect
on ignition.
Our expansion manifold simply
turns that principle around. The
internal geometry is radically
different from that on a resonance
intake system. Key modifications
include a longer distributor pipe,
with a smaller diameter, and
shorter intake pipes. As a result,
the air is in the expansion phase
as it enters the combustion

chambers. Since expansion always
cools, the air/fuel temperature is
lower and ignition is significantly
improved – thereby increasing
performance.
Of course, the amount of air that
enters the engine under expan -
sion is less than it would be under
compression. To compensate
for this, we’ve simply increased
the boost pressure. The resulting
increase in temperature – again
through compression – is immedi -
ately offset by the uprated inter -
coolers. Instead of hot compressed air
entering the combustion

chambers, we now have cooler

air generating more power and
torque. As a consequence, there
is a major improvement in engine
efficiency and therefore lower fuel
consumption even under heav y
loads and at high revs.
As we said, sometimes you just
have to question established
ideas.
Exhaust system.
The exhaust system is made
from stainless steel. Its cataly tic
converters are extremely heat-
resistant, yet quick to reach
temperature – and thus optimum
performance – when the engine
is started from cold.
Advanced exhaust gas technology
ensures compliance with stringent
emissions standards, e.g. Euro 5
in EU markets, LEV II/ LEV in the
USA.
Servicing.
The 911 Turbo and 911 Turbo S
models are designed for a long
life. A self-adjusting belt drives
the generator, power-steering
pump and air-conditioning com -
pressor. Valve clearances are
adjusted hydraulically, thus avoid -
ing the need for any adjustment
work. The camshafts are driven
by timing chains that require
no maintenance and the ignition
system, with the exception of
the spark plugs, is also mainte -
nance-free. The cars come with
a t wo -year unlimited mileage
w a r ra n t y.
The long service intervals (see
separate price list) keep costs
and labour times down and save
resources, since fewer service
products and consumable parts
are used.
Performance | Engine
911 Turbo engine and exhaust system
· 40 ·· 41 ·

Index
Option Page
A
Air conditioning 81
A irbags 71
All-wheel drive 48
Aluminium Look 101
Anti-theft protection 84
Audio interface 88
Audio system 86
A xle concept 52
B
Bodyshell structure 70
BOSE
® Surround Sound
System 88
Brakes 66
C
Cabriolet 22
Carbon 101
CD/ DVD autochanger 86
Ceramic brake 68
Chassis 52
Child seats 83
Colours, exterior 92
Colours, hood 93
Cruise control 85
D
Design 16
Direct fuel injection (DFI) 32
Dry-sump lubrication 33
Dynamic cornering lights 65
Dynamic engine mount
system 60
E
Electronic engine
management 38
Engine 30
Engine management 38
Environment 74
Exhaust emission control 75
Exhaust gas turbocharging 36
Exhaust system 41
Expansion intake manifold 40
Exterior 16
Exterior mirrors 84
F
Factory collection 97
Fuel system 76
G
Glass rear screen 24
GPS navigation system 86
H
Hardtop 25, 99
Headlight cleaning system 64
Headlights 64
HomeLink
®
(garage door opener) 84
Hood 24
I
I numbers 98
Ignition 39
Instruments 81
Interior 80
L
Launch Control 59
Lighting 65
Lighting system 64
Light weight design 34
Luggage compartment 84
M
Manual gearbox 46
Model range 18
MP3 88
Multifunction steering wheel 44
N
Navigation 86
O
Oil supply 33
On-board computer 81
P
Pa rk A ssist 85
Personalisation 90
Porsche Active Suspension
Management (PASM) 53
Porsche Ceramic Composite
Brake (PCCB) 68
Porsche Communication
Management (PCM) 86
Porsche Doppelkupplung
(PDK) 42Porsche Side Impact

Protection System (POSIP) 72
Porsche Stabilit y
Management (PSM) 56
Porsche Torque Vectoring
(PT V) 50
Porsche Traction
Management (PTM) 48
Power and performance 110, 112
Power steering 54
R
Radio 86
Recycling 76
Roll-over protection 72
Roof transport system 84
S
Safet y 64
Seats 82
S e rv ic i n g 41
SPORT but ton 58
Sport Chrono Package Turbo 58
Steering 54
Steering wheels 44
T
Technical data 110
Touchscreen 86
Transmission 42
T V tuner 87
Tyre Pressure
Monitoring (TPM) 55
U
Universal audio interface 88
V
Variable Turbine Geometry
(V TG) 36
VarioCam Plus 38
Vehicle tracking system 84
Voice control system 87
W
Wheels 54
Wind deflector 25
Wood, macassar 101
Index
· 114 ·· 115 ·