Subaru IMPREZA GD 2007 Series Manual page 2407

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MECHANICAL
2. STI MODEL
Model
Cylinder arrangement
Valve system mechanism
Bore × Stroke
Piston displacement
Compression ratio
Compression pressure (at 200 — 300 rpm)
Number of piston rings
Engine
Intake valve timing
Exhaust valve timing
Valve clearance
Idle speed [at neutral position on MT]
Ignition order
Ignition timing
NOTE:
OS: Oversize US: Undersize
General Description
mm (in)
3
cm (cu in)
2
kPa (kgf/cm , psi)
Max. retard
Open
Min. advance
Max. retard
Close
Min. advance
Open
Close
Intake mm (in)
Exhaust mm (in)
rpm
BTDC/rpm
ME(H4DOTC)-6
2.5 L
Horizontally opposed, liquid cooled, 4-cylinder,
4-stroke gasoline engine
Belt driven, double overhead camshaft,
4-valve/cylinder
99.5 × 79.0 (3.917 × 3.110)
2,457 (150)
8.2
981 — 1,177 (10 — 12, 142 — 171)
Pressure ring: 2, Oil ring: 1
ATDC 5°
BTDC 25°
ABDC 65°
ABDC 35°
BBDC 55°
ATDC 5°
0.20±0.02 (0.0079±0.0008)
0.35±0.02 (0.0138±0.0008)
700±100 (No load)
800±100 (A/C ON)
1 → 3 → 2 → 4
17°±10°/700