Page 4 - E BOOK ENGINE MECHANICAL M2

1. TECHNICAL FEATURES OF 4B1 ENGINE

1. GENERAL INFORMATION
The 4B1 series engines are adopted on OUTLANDER, ASX, LANCER-EX, and LANCER Evolution.
These are a 4-cylinder, double overhead camshaft (DOHC) engines, and are available in 2.0 Liter or
2.4 Liter cylinder displacement. These engines have the following features:

◆ The cylinder block is made of an aluminum alloy
◆ Valve train with direct-acting valve tappets
◆ Silent timing chain
◆ MIVEC (Mitsubishi Innovative Valve timing Electronic Control system) for both the intake and ex-
haust valves
(Note: The construction and the operation of MIVEC is described in the following chapter)

<Engine Overview>

Auto tensioner Plastic intake manifold Ignition coil

Location of Engine No. Electronic controlled throttle body All die-cast cylinder block
Fig. 1-1

<Main Specifications>

Item Specification
Engine model 4B11 4B12
Type In-line OHV, DOHC
Number of cylinders 4
Combustion chamber shape Pent-roof type
Total displacement mL 1,998 2,359
Cylinder bore mm 86 88
Piston stroke mm 86 97
Compression ratio 10 10.5
Maximum output kW / r/min 113 / 6,000 125 / 6,000

Maximum torque N·m / r/min 198 / 4,250 226 / 4,100
Fuel injection system type Electronic control MPI
Ignition system type Electronic spark-advance control type (4-coil)

Pub. No. PTAE1225 1 - 1