Subaru EJ257 Engine Specs
Subaru
Quick overview
Subaru EJ257 is a 2.5L (2457 cc) petrol engine with 305 HP, 393 Nm, 8.2:1 compression ratio. Fuel consumption: 13.2-9.1L/100km. Typical service life: 180,000+.
305
HP
2.5L (2457 cm³)
Displacement
393 Nm @ 4000 RPM
Torque
Petrol
Fuel
Description
The Subaru EJ257 is a turbocharged boxer-4 engine that powered Subaru's high-performance STI models. Known for its distinctive boxer rumble and excellent handling characteristics due to its low center of gravity, it became an icon in the performance car world despite some reliability challenges.
General Information
Production Years:
2004-2014
Fuel Type:
Petrol
Environmental Standards:
Euro 4
Fuel Consumption:
13.2-9.1L/100km (25.8-17.8 mpg)
Power (HP):
305
Displacement:
2.5L (2457 cm³) (149.9 cu.in)
Torque:
393 Nm @ 4000 RPM (290-2950 lb-ft)
Cylinder Block Alloy:
Aluminum alloy
Cylinder Head Alloy:
Aluminum alloy
Has Turbo:
Yes
Engine Layout:
Boxer-4
Aspiration Type:
Turbocharged
Fuel System:
Electronic Fuel Injection
Head Type:
DOHC, 16 valves
Timing Drive:
Belt
Cooling Type:
Liquid cooling
Cylinders Count:
4
Technical Details
Cylinder Diameter:
99.5mm
Piston Stroke:
79.0mm
Total Valves:
16
Firing Order:
1-3-4-2
Weight:
140 kg (309 lbs)
Rings per Piston:
3 (2/1)
Compression Ratio:
8.2:1
Hydraulic Lifters:
No
Cylinder Coating:
Cast iron sleeve
Minimum Octane:
95
Maintenance
Oil Capacity:
4.2L (4.4 qts)
Recommended Oil:
5W-30
Operating Temperature:
80-90°C (176-194°F)
Thermostat Temperature:
87-92°C (189-198°F)
Service Life (km):
180,000+ (112 miles)
Timing Belt/Chain Interval:
100,000 km