torque MITSUBISHI LANCER EVOLUTION VIII 2004 Workshop Manual

11ENGINE (4G6) – GENERAL
SECTION 1
ENGINE (4G6)
CONTENTS
General ....................................................11
1. Major Specifications ....................................11
2. Engine Performance Curve.........................12
Base Engine (6 M/T) ...............................12
1. Cylinder head gasket...................................12
2. Pistons ..........................................................13
3. Piston rings (2nd) ........................................134. Oil rings ........................................................14
5. Counterbalance shaft .................................14
6. Camshaft.......................................................15
Intake / Exhaust System (6 M/T)............16
1. Exhaust system ...........................................16
Control system (6 M/T) ...........................18
1. Supercharging pressure control ..............110
General
The 4G63T/C engine fitted in the Lancer Evolution VIII MR is basically the same as the 4G63T/C engine used in the Lancer
Evolution VIII.
The basic structure is the same in both the 6M/T (6speed) and 5M/T (5speed) versions, but the following improvements have
been made to the 6M/T version, in order to achieve higher performance.
• Adoption of 5ply cylinder head gasket
• Addition of Vshaped groove in piston , and modified shape in cooling channel
• Reduced oil consumption by increasing tension in piston rings and reducing endtoend gap
•Extra durability and reduced oil consumption by using new treatment on outer surface of oil ring side rail, and altering
thickness
•Lighter counterbalance shaft
• Increased output at high engine speeds by modifying intake cams
Major Specifications
Item 6 M/T5M/T
Total Displacement cc1997
Combustion chamberPentroof type
Bore x stroke (mm)85.0 x 88.0
Compression ratio8.8
Camshaft arrangementDOHC4 valve
FuelPremium unleaded
Max. output (kW/rpm)206/6500
Max. torque (Nm/rpm)400/3500392/3500
Fuel systemElectronic controlled multipoint fuel injection
Ignition systemElectronic controlled twocoil
Lash adjusterEquipped

ENGINE (4G6) – GENERAL, BASE ENGINE (6 M/T)12
2. Engine performance curve (6 M/T)
Base Engine (6 M/T)
1. Cylinder head gasket
A5ply metal gasket has been introduced, in order to improve sealing properties.
Shaft output (kW)Shaft torque (N•m)
Engine r.p.m.

ENGINE (4G6) – INTAKE / EXHAUST SYSTEM (6 M/T)16
Intake / Exhaust System (6 M/T)
1. Exhaust system
11 Turbocharger
A largenozzle 10.5T turbo has been adopted in order to improve mid to highrange torque. Optimum control of the
supercharging pressure has ensured good torque and response at medium engine speeds.The positions of the turbine housing and the wastegate holes have also been changed to achieve smoother outflow and
increase lowspeed torque. Along with these modifications, the wastegate valve has been changed from an oval to a circular
valve.
(Evolution VIII MR) (Evolution VIII)
Turbine housingTurbine housing
Wastegate holes Wastegate holes
Oval valve Circular valve

ENGINE (4G6) – CONTROL SYSTEM (6 M/T)110
1. Supercharging pressure control
The maximum torque has been increased, compared to the 4G63DOHCT/C engine in the current Lancer Evolution VIII, by
installing an additional wastegate solenoid valve (increased from 1 to 2 valves).
By adding a parallel No.2 wastegate solenoid valve to the previous system, provides extra relief capacity for the pressure
applied to the wastegate actuator thus increasing the range of supercharging pressure..
The engine ECU raises the supercharging pressure even further, thus raising the maximum torque, by driving the No.2
wastegate solenoid valve when the engine approaches maximum torque.
The No.1 wastegate solenoid valve is essentially controlled in the same way as previously.
Air flow
sensor
Knock
sensor
Engine
ECUBatterySecondary air
control solenoidvalve
Secondary
air valve
Ignition
switch
Air
intakeBypass valveVacuum tank
Intercooler
Turbocharger
Wastegate
actu
ator No. 1
wastegate
solenoid
valve
No. 2 wastegate
solenoid valve Crank angle
sensor

REFERENCE MA
TERIAL – MAIN SPECIFICATIONS / DETAILED SPECIFICATIONS84
GHCT9AItem
SNDFZSJDFZSJGFZ
Minimum ground clearance m0.140¨¨
Max. speed (estimated) km/h180¨¨
Fuel consumption km/l (10/15 mode)9.69.7¨
Braking distance m (initial speed in
km/h) È49 (100)
[Vehicle with15" brakes]
43 (100)
[Vehicle with17" brakes]¨¨
Performance
Min. turning radius m5.9¨¨
Bore x stroke mm85.0 X 88.0¨¨
Compression ratio8.8 (Unleaded
Premium)¨¨
Max. output net [k/W r.p.m.]206 / 6500
(net)¨¨
Max. torque N•m/rpm.392 / 3500
(net)400 / 3500
(net) Ȩ
OpenBTDC 21˚BTDC 17˚
ȨIntake
ClosedABDC 59˚ABCD 63˚
Ȩ
OpenBBDC 58˚¨¨
Engine
Valve or
port timing
Exhaust
ClosedATDC 18˚¨¨
Fuel tank capacity (litres)50¨55
Type and performance of ignition
equipmentElectronic:
20˚~ 45˚¨¨
Type of spark plugsIGR7A,
IGR7AG,S22PRA7,VW22PRDA7¨¨
Battery capacity Ah34 (5), 48 (5)
or 52 (5)¨¨
Electrical
Equipment
Alternator output VA12 – 58, 90,
100 or 105¨¨
Detailed Specifications
These Detailed Specifications are based on submitted data, and may therefore differ from the actual equipment.
The
symbol indicates specifications which have changed from the previous model.

FRONT SUSPENSION – STRUT ASSEMBLY33A3
CAUTION
(1) To compress the coil spring securely, ensure that the
special tool is extended as far as the spring will allow,
then fitted evenly to the coil spring.
(2)There is a danger of special tool damage, so do not use
an impact wrench.
2. Using the following special tools, release the selflocking nut.
• Special spanner (MB991367)
• Pin (MB991385)
CAUTION
There is a danger of the lock nut inside the strut piston rodworking loose, so when loosening the selflocking nut, do
not use an impact wrench.
Important note on assembly
Fitting selflocking nut
1. With the coil spring compressed with the special tool,
temporarily tighten the selflocking nut.
2. Match up strut assembly hole in lower spring seat, and hole in
upper spring seat.
Remarks
Using a lever to align the holes can make this job easier.
3. Match both tips of coil spring precisely with the slots on the
spring seats, and release the special tool.
4. Using the special tool, tighten the selflocking nut to the
specified torque.
Tightening tor
que: 60 ± 10N·m
CAUTION
There is a danger of the lock nut inside the strut piston rod
working loose, so when loosening the selflocking nut, do
not use an impact wrench.
A