Self-Study Programme 388 4.2L V8 4V FSI engine.pdf

Service Training

Self-study Programme 388

The 4.2l V8 4V FSI Engine

Design and Function

The 4.2l V8 4V FSI engine is a further example of

direct petrol injection. It replaces the 4.2l V8 5V

engine in the Touareg. Apart from the common

cylinder bank angle of 90°, the two engines are no

longer comparable.

With output of 257 kW and 440 Nm of torque, the

engine offers very good performance, outstanding

dynamics and a high level of ride comfort. This engine

has already been launched in the Audi Q7.

S388_002

This self-study programme provides information on the design and function of this new engine

generation.

NEW

Important

Note

The self-study programme shows the design and

function of new developments.

The contents will not be updated.

For current testing, adjustment and repair

instructions, refer to the relevant service literature.

Contents

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Technical features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Engine mechanics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Chain drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Ancillary unit drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Intake system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Cylinder block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Cylinder heads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Oil supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Crankcase breather and ventilation system . . . . . . . . . . . . . . . . . . . . . . . . . 14

Cooling circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Fuel system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Exhaust system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19

Engine management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

System overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

CAN networking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Actuators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Functional diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

Test yourself . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

Introduction

Special technical features

The 4.2l V8 4V FSI engine is the most recent example of a direct petrol injection engine from Volkswagen. It is the

successor of the 4.2l V8 5V engine with intake manifold injection. In addition to direct petrol injection, certain new

features have been implemented in both the engine management and in the engine's mechanical systems.

S388_003

Technical features

Bosch Motronic MED 9.1.1

Continuous inlet and exhaust camshaft timing

adjustment

●

Direct petrol injection

●

Homogenous mode (Lambda 1)

Two-stage magnesium variable intake manifold

with integrated intake manifold flap change-over

●

Double injection catalytic converter heating

●

Electronic throttle

Two-piece cylinder block

●

Two hot film air mass sensors

Flywheel-end chain drives for camshafts and

ancillary units

●

Electronically regulated cooling system

●

Adjustment of the variable intake manifold and

intake manifold flap change-over by means of an

electric motor

Spur gear drive for ancillary units

●

Secondary air system

●

Technical data

Torque and output diagram

rpm

S388_004

Technical data

Engine code

BAR

Type

8 cylinders with 90° V angle

Displacement in cm³

4163

Bore in mm

84.5

Stroke in mm

92.8

Valves per cylinder

Compression ratio

12.5:1

Maximum output

257 kW at 6800 rpm

Maximum torque

440 Nm at 3500 rpm

Engine management

Bosch Motronic MED 9.1.1

Fuel

Premium plus unleaded RON 98 or

premium unleaded RON 95

Exhaust gas treatment

4 catalytic converters, 4 lambda probes, secondary air system

Emissions standard

EU 4

Plik z chomika:

Inne pliki z tego folderu:

Inne foldery tego chomika: