Self-Study Programme 217 V8 5v engine.pdf

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217
Service.
The V8-5V Engine
Construction Features and Functions
Self-Study Programme 217
For internal use only
AUDI has been producing advanced 8-cylinder
engines since 1988. Their capacity has increased
from 3.6 l to 4.2 l.
The V8 engine in combination with Aluminium
Space Frame technology was the technical basis
for Audi's breakthrough into the luxury class.
SSP217_048
Steps to enhance the value of the Audi A8 have
included the redesign of the V8 engine.
The new V8-5V engines are now also available for
the Audi A6 model range.
2
Content
Page
Introduction
Technical data ....................................................................... 5
Engine - Mechanics
Crankgear ..............................................................................
Engine mounting ..................................................................
Engine lubrication ................................................................
Cooling circuit .......................................................................
Cylinder head
Five-valve technology .............................................
Roller rocker ............................................................
Camshaft adjuster ..................................................
Toothed-belt drive; cylinder-head seal .................
Cylinder-head cover seal ........................................
Exhaust manifold ....................................................
6
9
10
16
19
20
22
24
25
26
Engine - Motronic Subsystems
Variable intake manifold ...................................................... 27
Secondary air system ........................................................... 32
Engine Management
System overview ...................................................................
Function diagram .................................................................
Quick-start functions
Camshaft position sensor ......................................
Engine run-down sensor ........................................
Electronic throttle function .................................................
CAN bus interfaces ...............................................................
Additional signals / interfaces ............................................
36
38
40
41
42
44
46
Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
New!
The self-study programme provides you with information
concerning the engine's construction features and functions.
The self-study programme is not a repair manual!
When carrying out maintenance and repair work, it is essential
to use the latest technical literature.
Caution!
Important!
3
Introduction
V8-5V Engines
SSP213_073
Major modifications were made to the
V8 engines during the course of further
development.
Emphasis was placed on the following
development objectives:
– compliance with future exhaust-emission
regulations
– reduction of fuel consumption
– increase in torque and power
– improvement of comfort and convenience
– reduction of engine weight
– increased use of shared components for
the AUDI engine series.
The following new features and modifications
have been incorporated in the V8 4-valve
engine.
New features
– Five-valve cylinder head with roller rocker
– Camshaft adjustment
– 3-stage variable intake manifold
– Engine management system, Bosch ME 7.1
– Electro-hydraulic engine mounting
Modifications
– to crankcase and crankgear
– to oil circuit
– to cooling circuit
4
Technical data
3.7 l
Engine code
AQG
4.2 l
AQF (A8)
ARS (A6)
400
3.7 l V8-5V engine
200
350
175
Design
Capacity
Power output
V8 engine with 90
o
V angle
300
150
250
125
191 kW
260 hp
at
6000 rpm
51.6 kW/l
70.3 hp/l
350 Nm at
3200 rpm
94.7 Nm/l
228/220 kW
310/300 hp
at
6000 rpm
54.6 kW/l
74.3 hp/l
410 Nm at
3000 rpm
98.3 Nm/l
200
100
150
75
100
50
Specif. output
50
25
Torque
0
0
0
1000 2000 3000 4000 5000 6000 7000
Speed (rpm)
SSP217_004
Specif.
torque
Bore
Stroke
Compression
ratio
Weight
Engine
management
Fuel
Firing
sequence
Exhaust-emis-
sion standard
4.2 l V8-5V engine
500
450
250
225
200
175
150
125
100
75
50
25
0
1000 2000 3000 4000 5000 6000 7000
84.5 mm
82.4 mm
11:1
198 kg
84.5 mm
400
93.0 mm
11:1
Torque (Nm)
200 kg
350
300
250
200
150
100
50
0
0
Motronic ME 7.1
98/95 RON
1-5-4-8-6-3-7-2
Speed (rpm)
SSP217_005
EU 3
The specified power data is only
possible if 98 RON fuel is used.
A reduction in power output must be
expected if 95 RON fuel is used.
Power output (kW)
Power output (kW)
3697 cm
3
4172 cm
3
Torque (Nm)
5

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