Lexus RX300 (MCU15). Manual — part 37

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3. Technical Description

ENGINE — 1MZ-FE ENGINE

ENGINE

22

1MZ-FE ENGINE

JDESCRIPTION

The 1MZ-FE engine has adopted the VVT-i (Variable Valve Timing-intelligent) system and 3-stage ACIS
(Acoustic Control Induction System) to improve engine performance and fuel economy and to reduce ex-
haust emissions. In addition, it has adopted the active control engine mount to reduce noise and vibration.

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ENGINE — 1MZ-FE ENGINE

23

" Specifications A

Item

1MZ-FE Engine

No. of Cyls. & Arrangement

6-Cylinder, V Type

Valve Mechanism

24-Valve, DOHC,
Belt & Gear Drive

Combustion Chamber

Pentroof

Manifolds

Cross-Flow

Fuel System

EFI

Displacement

cm

3

(cu. in.)

2995 (182.7)

Bore

Stroke

mm (in.)

87.5

83.0

(3.44

3.27)

Compression Ratio

10.5 : 1

Max. Output

[EEC]

—

Max. Torque

[EEC]

—

Intake

Open

–4

_ ∼ 56_BTDC

Valve

Intake

Close

60

_ ∼ 0_ABDC

Valve
Timing

Exhaust

Open

46

_ BBDC

Exhaust

Close

2

_ ATDC

Fuel Octane Number

RON

91 or higher

Oil Grade

API SJ EC or ILSAC

ENGINE — 1MZ-FE ENGINE

24

JFEATURES OF 1MZ-FE ENGINE

The 1MZ-FE engine has been able to achieve the following performance through the adoption of the items
listed below.

(1) High performance and fuel economy
(2) Low noise and vibration
(3) Lightweight and compact design
(4) Good serviceability
(5) Clean emission

Item

(1)

(2)

(3)

(4)

(5)

The VVT-i system is used.

f

f

Compact plug-in type mass air flow meter is used.

f

The direction of the rotation of the electric cooling fan has
been reversed to reduce intake air temperature.

f

A 2-valve throttle body has been adopted to accommodate the
3-stage ACIS.

f

A ball joint has been adopted at the exhaust pipe to reduce
vibration.

f

A 2-way exhaust control system has been adopted to improve
engine performance and to ensure an even quieter operation.

f

f

A DIS (Direct Ignition System) makes ignition timing adjust-
ment unnecessary.

f

f

An active control engine mount is used on the front engine
mount and a liquid-filled compound mount is used on the rear
engine mount.

f

Iridium-tipped spark plugs have been adopted to improve
ignition.

f

f

An aluminum radiator core is used for weight reduction.

f

A fuel returnless system has been adopted to prevent the inter-
nal temperature of the fuel tank from rising, and to reduce the
evaporative emissions.

f