Mitsubishi Evolution X. Manual — part 51

GENERAL DESCRIPTION

TSB Revision

ENGINE

11-2

GENERAL DESCRIPTION

M2112000101526

This model is equipped with a newly developed 4B11
engine. It is a 4-cylinder, double overhead camshaft
(DOHC) engine with a 2.0-L cylinder displacement.
This engine has adopted the following features:

• MIVEC (MITSUBISHI INNOVATIVE VALVE TIM-

ING ELECTRONIC CONTROL SYSTEM) for
both the intake and exhaust valves

• Cylinder block made of an aluminum alloy

• Valve train with direct-acting valve tappets

• Silent timing chain

MAIN SPECIFICATIONS

Descriptions

Specification

Engine model

4B11

Type

In-line OHV, DOHC

Number of cylinders

4

Combustion chamber shape

Pentroof type

Total displacement cm

3

(cu in)

1,998 (121.9)

Cylinder bore mm (in)

86 (3.4)

Piston stroke mm (in)

86 (3.4)

Compression ratio

10.0

Maximum output kW/r/min (HP/r/min)

217/6,500 (291/6,500)

Maximum torque N

⋅m/r/min (ft-lbs/r/min)

407/4,000 (300/4,000)

Fuel injection system type

Electronic control MPI

Ignition system type

Electronic spark-advance control type (4-coil)

BASE ENGINE

TSB Revision

ENGINE

11-3

BASE ENGINE

M2112001001351

CYLINDER HEAD

A cylinder head made of an aluminum alloy, which is
lightweight and offers a high level of cooling effi-
ciency, has been adopted. A pentroof combustion
chamber with a center spark plug has been adopted.
It has a small valve compound angle to realize a
compact chamber.

Cross-flow type intake and exhaust ports have been
adopted. Two intake ports and two exhaust ports are
provided independently on the right and left sides.
Five camshaft bearings are provided at the intake
and exhaust sides, respectively. The No. 4 bearing
sustains the thrust load of the camshaft. Only the No.
1 bearing uses a bearing cap that integrates both the
intake and exhaust sides.

VALVE SEATS

Sintered alloy valve seats have been adopted.
The oversized (0.3 mm) service parts are available.

VALVE GUIDES

Valve guides that are common to both the intake and
exhaust have been adopted.
The oversized (0.25 mm) service parts are available.

AK502483

Valve guide

AD

Exhaust side

Intake side

BASE ENGINE

TSB Revision

ENGINE

11-4

CYLINDER HEAD GASKET

A five-layer, metal type cylinder head gasket that
excels in heat resistance and sealing performance
has been adopted.

CYLINDER HEAD COVER

A aluminum cylinder head cover has been adopted.

AK703203

AK703204

BASE ENGINE

TSB Revision

ENGINE

11-5

CYLINDER BLOCK

A cylinder block made of an aluminum alloy has
been adopted for weight reduction.
5 bearings are used for the crankshaft journals and
the No. 3 bearing sustains the thrust load of the
crankshaft.
The water jacket is the full Siamese type.
An chain oil jet is used in front of the cylinder block to
supply engine oil to the timing chain.
The oil jet cooling the piston is placed on the cylinder
block lower plane which is the main bearing among
cylinders.

One bearing cap is tightened with four bolts.

AK703205AD

Bearing cap bolt <M10>

Oil jet

Chain oil jet

Bearing cap bolt <M8>

Bearing cap

Ladder frame

Cylinder block

ITEM

SPECIFICATIONS

Distance between top and
crankshaft center mm (in)

230.1 (9.06)

Bore mm (in)

86 (3.4)

Bore pitch mm (in)

96 (3.8)

Stroke mm (in)

86 (3.4)