General description, A: specifications, Me(h4dotc)-2 – Subaru Impreza 2004 User Manual
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ME(H4DOTC)-2
MECHANICAL
General Description
1. General Description
A: SPECIFICATIONS
1. DOHC TURBO MODEL (EXCEPT FOR STi AND AUSTRALIA MODEL)
NOTE:
STD: Standard
I.D.: Inner Diameter
O.D.: Outer Diameter
OS: Oversize
US: Undersize
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
Ч 75 (3.62 Ч 2.95)
Piston displacement
cm
3
(cu in)
1,994 (121.67)
Compression ratio
8.0
Compression pres-
sure (at 200 — 300
rpm)
kPa (kgf/cm
2
, psi)
981 — 1,177 (10 — 12, 142 — 171)
Number of piston rings
Pressure ring: 2, Oil ring: 1
Intake valve timing
Opening
BTDC 10
°
Closing
ABDC 50
°
Exhaust valve timing
Opening
BBDC 53
°
Closing
ATDC 7
°
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 or “P” or
“N” range on AT]
rpm
700
±100 (No load)
800
±150 (A/C switch ON)
Firing order
1
→ 3 → 2 → 4
Ignition timing
BTDC/rpm
12
°±10°/700
Belt
tension
adjuster
Protrusion of adjuster rod
5.2 — 6.2 mm (0.205 — 0.244 in)
Belt
tensioner
Spacer O.D.
17.955 — 17.975 mm (0.7069 — 0.7077 in)
Tensioner bush I.D.
18.0 — 18.08 mm (0.7087 — 0.7118 in)
Clearance between spacer and bush
STD
0.025 — 0.125 mm (0.0010 — 0.0049 in)
Limit
0.175 mm (0.0069 in)
Side clearance of spacer
STD
0.2 — 0.55 mm (0.0079 — 0.0217 in)
Limit
0.81 mm (0.0319 in)
Camshaft
Bend limit
0.020 mm (0.0079 in)
Thrust clearance
STD
0.040 — 0.080 mm (0.0016 — 0.0031 in)
Limit
0.10 mm (0.0039 in)
Cam lobe height
Intake
STD
46.25 — 46.35 mm (1.821 — 1.825 in)
Limit
46.15 mm (1.817 in)
Exhaust
STD
46.15 — 46.25 mm (1.817 — 1.821 in)
Limit
46.05 mm (1.813 in)
Journal O.D.
STD
Front
37.946 — 37.963 mm (1.4939 — 1.4946 in)
Center
rear
29.946 — 29.963 mm (1.1790 — 1.1796 in)
Oil clearance
STD
0.037 — 0.072 mm (0.0015 — 0.0028 in)
Limit
0.10 mm (0.0039 in)
Cylinder
head
Surface warpage limit
0.05 mm (0.0020 in)
Surface grinding limit
0.3 mm (0.012 in)
Standard height
127.5 mm (5.02 in)