Subaru EJ20 Engine Specifications
The Subaru EJ20 engine is a well-known flat-four (boxer) engine that has been a staple in many Subaru models since its introduction in the early 1980s. This engine is renowned for its unique design, compact size, and balanced performance. Below is a detailed overview of the EJ20 engine specifications.
| Specification | Value |
|---|---|
| Engine Type | 4-cylinder, horizontally opposed (boxer) |
| Displacement | 2.0 liters (1994 cc) |
| Bore x Stroke | 92 mm x 75 mm |
| Compression Ratio | 8.0:1 to 10.0:1 (varies by model) |
| Power Output | 140-280 hp (varies by model and tuning) |
| Torque | 180-400 Nm (varies by model and tuning) |
| Fuel System | Multi-Point Fuel Injection (MPFI) |
| Fuel Type | Premium unleaded gasoline |
| Ignition System | Distributor-less ignition system (DLIS) |
| Cooling System | Water-cooled |
| Weight | Approximately 140 kg (308 lbs) |
Engine Configuration
The EJ20 engine features a horizontally opposed design, commonly referred to as a boxer engine. This configuration provides several advantages:
- Lower Center of Gravity: The flat design allows for a lower center of gravity, improving vehicle stability and handling.
- Reduced Vibration: The opposing pistons cancel out each other’s vibrations, resulting in smoother operation.
- Compact Size: The engine’s design allows for a more compact engine bay, which can lead to better weight distribution in the vehicle.
The EJ20 is available in various configurations, including naturally aspirated and turbocharged versions. The turbocharged variants are particularly popular for their enhanced performance, making them a favorite among enthusiasts.
Key Features of the EJ20 Engine Configuration
– Layout: Flat-four (horizontally opposed)
– Valvetrain: DOHC (Dual Overhead Camshaft) with 16 valves
– Turbocharging: Available in certain models, enhancing power output significantly
– Intercooler: Often equipped in turbocharged variants to improve performance
Engine Oil Specifications
Proper engine oil is crucial for the longevity and performance of the Subaru EJ20 engine. The following specifications are recommended for optimal operation:
| Specification | Value |
|---|---|
| Oil Type | Synthetic or Conventional |
| Viscosity Grade | 5W-30 or 10W-40 (varies by climate) |
| Oil Capacity (with filter) | 5.5 liters (5.8 quarts) |
| Oil Filter | Subaru OEM or equivalent |
Service Intervals
Regular maintenance is essential to keep the EJ20 engine running smoothly. Below are the recommended service intervals for oil changes and other critical maintenance tasks.
Oil Change Intervals
– Every 5,000 to 7,500 miles (8,000 to 12,000 km) for conventional oil
– Every 6,000 to 8,000 miles (10,000 to 13,000 km) for synthetic oil
Other Maintenance Tasks
– Air Filter Replacement: Every 15,000 to 30,000 miles (24,000 to 48,000 km)
– Fuel Filter Replacement: Every 30,000 miles (48,000 km)
– Spark Plug Replacement: Every 60,000 to 100,000 miles (96,000 to 160,000 km)
– Timing Belt Replacement: Every 105,000 miles (168,000 km) for models equipped with a timing belt
Conclusion
The Subaru EJ20 engine is a versatile and reliable powerplant that has earned a reputation for performance and durability. Its unique boxer configuration, combined with a range of specifications and maintenance requirements, makes it a popular choice among Subaru enthusiasts and everyday drivers alike. By adhering to the recommended oil specifications and service intervals, owners can ensure their EJ20 engine remains in optimal condition for years to come.
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