Subaru Impreza 2004 User Manual download pdf (Page 7)

ME(H4DOTC)-6

MECHANICAL

General Description

2. STi MODEL

NOTE:

STD: Standard I.D.: Inner Diameter O.D.: Outer Diameter OS: Oversize US: Undersize

Crankshaft

bearing

Crankshaft bearing thick-

ness

#1, #3

STD 1.998 — 2.011 mm (0.0787 — 0.0792 in)

0.03 mm

(0.0012

in) US

2.017 — 2.020 mm (0.0794 — 0.0795 in)

0.05 mm

(0.0020

in) US

2.027 — 2.030 mm (0.0798 — 0.0799 in)

0.25 mm

(0.0098

in) US

2.127 — 2.130 mm (0.0837 — 0.0839 in)

#2, #4, #5

STD 2.000 — 2.013 mm (0.0787 — 0.0793 in)

0.03 mm

(0.0012

in) US

2.019 — 2.022 mm (0.0795 — 0.0796 in)

0.05 mm

(0.0020

in) US

2.029 — 2.032 mm (0.0799 — 0.0800 in)

0.25 mm

(0.0098

in) US

2.129 — 2.132 mm (0.0838 — 0.0839 in)

Engine

Type

Horizontally opposed, liquid cooled, 4-cylinder,

4-stroke gasoline engine

Valve arrangement Belt driven, double overhead camshaft, 4-valve/cylinder

Bore × Stroke mm (in) 92 × 75 (3.62 × 2.95)

Piston displacement

(cu in)

1,994 (121.67)

Compression ratio 8.0

Compression pres-

sure (at 200 — 300

rpm)

kPa (kgf/cm

, psi)

981 — 1,177 (10 — 12, 142 — 171)

Number of piston rings Pressure ring: 2, Oil ring: 1

Intake valve timing

Opening

Max. retard ATDC 6°

Min. advance BTDC 24°

Closing

Max. retard ABDC 68°

Min. advance ABDC 38°

Exhaust valve timing

Opening BBDC 58°

Closing ATDC 10°

Valve clearance

Intake mm (in) 0.20±0.02 (0.0079±0.0008)

Exhaust mm (in) 0.35±0.02 (0.0138±0.0008)

Idling speed

[At neutral position on MT]

rpm

700±100 (No load)

800±150 (A/C switch ON)

Firing order 1 → 3 → 2 → 4

Ignition timing BTDC/rpm 12°±10°/700

1 2 3 4 5 6 7 8 9 10 11 12 ... 55 56

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Subaru Impreza 2004 User Manual Page 7

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