Mitsubishi Evolution X. Manual - part 51

GENERAL DESCRIPTION

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ENGINE

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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

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ENGINE

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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

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ENGINE

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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

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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)