Subaru 2009 IMPREZA Service Manual page 220

MECHANICAL
1. General Description
A: SPECIFICATION
Model
Cylinder arrangement
Valve system mechanism
Bore × Stroke
Displacement
Compression ratio
Compression pressure
(at 200 — 300 rpm)
Number of piston rings
Engine
Intake valve timing
Exhaust valve timing
Valve clearance
Idling speed (at "P" or "N" position on
AT model, or neutral position on MT
model)
Ignition order
Ignition timing
General Description
mm (in)
3
cm (cu in)
2
kPa (kg/cm , psi)
Open
Constant
Close
Open
Low speed
Close
Open
High speed
Close
Open
Close
Intake
mm (in)
Exhaust
No load
rpm
A/C ON
BTDC/rpm
ME(H4SO)-2
2.5 L
Horizontally opposed, liquid cooled, 4-cylinder,
4-stroke gasoline engine
Belt driven,
single overhead camshaft,
4 valve/cylinder
99.5 × 79.0 (3.92 × 3.11)
2,457 (149.94)
10.0
1,020 — 1,275 (10.4 — 13.0, 148 — 185)
Pressure ring: 2, Oil ring: 1
BTDC 0°
ABDC 58°
BTDC 0°
ABDC –10°
BTDC 14°
ABDC 62°
BBDC30°
ATDC14°
0.20 0.04 (0.0079 0.0016)
0.25 0.04 (0.0098 0.0016)
AT model: 700 100
MT model: 650 100
850 100
1 3 2
AT model: 15° 10°/700
MT model: 10° 8°/650
4