Subaru IMPREZA GD 2007 Series Manual page 2403

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MECHANICAL
1. General Description
A: SPECIFICATION
1. EXCEPT FOR STI MODEL
Model
Cylinder arrangement
Valve system mechanism
Bore × Stroke
Piston displacement
Compression ratio
Compression pressure
(at 200 — 300 rpm)
Number of piston rings
Intake valve timing
Engine
Exhaust valve timing
Valve clearance
Idling speed [at neutral position
on MT, or "P" or "N" position on
AT]
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 Standard
mm (in)
Exhaust Standard
No load
rpm
A/C ON
MT model
BTDC/rpm
AT model
ME(H4DOTC)-2
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 (3.92 × 3.11)
2,457 (149.94)
8.4
981 — 1,177 (10 — 12, 142 — 171)
Pressure ring: 2, Oil ring: 1
ATDC 5°
BTDC 35°
ABDC 65°
ABDC 25°
BBDC 55°
ATDC 5°
0.20±0.02 (0.0079±0.0008)
0.35±0.02 (0.0138±0.0008)
MT: 700±100
AT: 700±100
A/C refrigerant pressure MT: 725±100
is low AT: 750±100
A/C refrigerant pressure MT: 800±100
is high AT: 825±100
1 → 3 → 2 → 4
17°±10°/700
17°±10°/700