Mitsubishi Lancer Evolution 7. Manual — part 6
ENGINE -
Base Engine
1-3
BASE ENGINE
PISTON
The top land height has been changed from 5 mm to 6 mm, and the second land height has been
changed from 4.5 mm to 5 mm.
<NEW>
<OLD>
6 mm
5 mm
5 mm
4.5 mm
PISTON RING
The tension of the rings has been changed as shown in the table below, and the thicknesses of the
No. 2 ring and the oil ring have been reduced in order to provide reduced engine friction.
NEW
OLD
PISTON RING No. 1
9.5 N
8.34 N
PISTON RING No. 2
7.0 N
10.49 N
OIL RING
25.0 N
33.34 N
PISTON RING No. 1
PISTON RING No. 2
OIL RING
0.20 ∼ 0.30 mm (New models)
0.25 ∼ 0.35 mm (Old models)
0.35 ∼ 0.50 mm (New models)
0.40 ∼ 0.55 mm (Old models)
0.10 ∼ 0.40 mm
1.2 mm
1.2 mm (New models)
1.5 mm (Old models)
2.0 mm (New
models)
2.8 mm (Old
models)
3.1 mm
3.5 mm (New models)
3.8 mm (Old models)
2.2 mm (New models)
2.5 mm (Old models)
ENGINE -
Lubrication System
1-4
LUBRICATION SYSTEM
ENGINE OIL COOLER
The drawn cup air-cooled type engine oil cooler has been adopted. The engine oil cooler is installed
below the right head lamp assembly and brings in the air through the oil cooler duct of the front bumper
to cool the engine oil.
SPECIFICATIONS
Items
Specifications
Type
Drawn cup type
Core size mm (Width × Hight × Thickness)
160 × 200 × 49
Engine oil cooler oil amount L
0.35
Performance kJ/h
29,900
CONSTRUCTION DIAGRAM
Engine oil cooler
Engine oil cooler
feed hose
Engine oil cooler
return hose
ENGINE -
Cooling System
1-5
COOLING SYSTEM
The cooling system is a water-cooled pressurized, forced circulation type which offers the following features.
D
To improve the reliability of cavitation at a high engine speed and to increase the amount of engine
coolant, output control system in which a thermostat is installed at the outlet of engine coolant from
the engine to the radiator has been adopted.
D
To improve the engine cooling performance and save weight, a plastic tank and an aluminium radiator
fins have been introduced.
D
The speed of electric cooling fan is optimally controlled by a radiator fan controller and the engine-ECU
according to driving conditions so that the fan operating noise is minimized and the fuel efficiency
is improved.
SPECIFICATIONS
Items
Specifications
Cooling method
Water-cooled pressurized, forced circulation with electrical fan
Radiator
Type
Pressurized corrugate type
Performance kJ/h
216,700
Water pump
Type
Impeller of centrifugal type
Drive method
Drive belt
Thermostat
Type
Wax pellet type with jiggle valve
Valve open temperature _C
80 ± 1.5
CONSTRUCTION DIAGRAM
Reserve tank
Radiator
Radiator fan
motor
Radiator fan
controller
Shroud
ENGINE -
Intake and Exhaust
1-6
INTAKE AND EXHAUST
AIR INTAKE SYSTEM
AIR DUCT, AIR CLEANER
D
By introducing fresh cool air from the top of the radiator efficiently, the engine performance has been
enhanced and intake air noise has been reduced.
D
Burnable used paper mixed with plastic materials have been adopted in consideration for reduction
of industrial wastes and protection of global environment.
AIR INTAKE HOSE
Unleaded rubber materials have been adopted for air intake hose in consideration for protection of global
environment.
CONSTRUCTION DIAGRAM
Air intake hose
Air cleaner assembly
Air duct
INTER COOLER
By mounting an air cooled intercooler to reduce the intake air temperature after boosting, engine output
has been improved. The features of the air cooled intercooler are as follows.
D
Large intercooler (Core size: 289.5×490×
65 mm)
D
Air guides are mounted to the bottom of the intercooler.
CONSTRUCTION DIAGRAM
Air guide
Inter cooler assembly
490 mm
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