Index Subaru Subaru Impreza 3 / Impreza WRX / Impreza WRX STI - service repair manual 2008-2014 year
|
|
ME(STI)-2 General Description MECHANICAL 1. General Description A: SPECIFICATION Engine Model 2.5 L Cylinder arrangement Horizontally opposed, liquid cooled, 4-cylinder, 4-stroke gasoline engine Valve system mechanism Belt driven, double overhead camshaft, 4-valve/cylinder Bore × Stroke mm (in) 99.5 × 79.0 (3.92 × 3.11) Displacement cm 3 (cu in) 2,457 (149.94) Compression ratio 8.2 Compression pressure kPa (kg/cm 2 , psi) Standard 981 — 1,177 (10 — 12, 142 — 171) Number of piston rings Pressure ring: 2, Oil ring: 1 Intake valve timing Open Max. retard ATDC 5° Min. advance BTDC 25° Close Max. retard ABDC 65° Min. advance ABDC 35° Exhaust valve timing Open Max. retard BBDC 32° Min. advance BBDC 72° Close Max. retard ATDC 28° Min. advance BTDC 12° Valve clearance mm (in) Inspection Intake 0.20 +0.04
–0.06 (0.0079 +0.0016
–0.0024 ) Exhaust 0.35±0.05 (0.0138±0.0020) Adjustment Intake 0.20 +0.01
–0.03 (0.0079 +0.0004
–0.0012 ) Exhaust 0.35±0.02 (0.0138±0.0008) Idle speed (Gear shift lever is rpm No Standard 700±100 A/C Standard 750±100 Ignition order 1 → 3 → 2 → 4 Ignition timing BTDC/rpm Standard 15°±10°/700 |