Subaru EA81 Engine Overview
The Subaru EA81 engine is a notable powerplant that has earned a reputation for its reliability and efficiency. Introduced in the late 1970s, this engine was designed for various Subaru models, including the Subaru Brat, Subaru Leone, and Subaru DL. With its unique configuration and robust performance, the EA81 has become a favorite among enthusiasts and those seeking a dependable vehicle.
Engine Specifications
The following table outlines the detailed specifications of the Subaru EA81 engine:
| Specification | Details |
|---|---|
| Engine Type | Flat-4 (Boxer) |
| Displacement | 1.8 liters (1781 cc) |
| Configuration | Horizontally opposed |
| Fuel System | Carbureted |
| Power Output | 75-90 hp (varies by model) |
| Torque | 100 lb-ft |
| Compression Ratio | 8.7:1 |
| Valvetrain | SOHC (Single Overhead Cam) |
| Fuel Type | Regular unleaded gasoline |
| Cooling System | Water-cooled |
| Weight | Approximately 300 lbs |
Engine Configuration
The Subaru EA81 features a horizontally opposed, or “boxer,” configuration. This design provides several advantages:
- Lower Center of Gravity: The flat layout helps lower the vehicle’s center of gravity, improving handling and stability.
- Reduced Vibration: The opposing pistons balance each other, resulting in smoother operation and less vibration.
- Compact Size: The engine’s design allows for a more compact engine bay, which can improve overall vehicle design and aerodynamics.
The EA81 engine is equipped with a single overhead cam (SOHC) valvetrain, which contributes to its reliability and ease of maintenance. The engine’s carbureted fuel system is designed for simplicity, making it easier to service compared to modern fuel injection systems.
Engine Oil Specifications
Proper lubrication is crucial for the longevity and performance of the Subaru EA81 engine. The following specifications outline the recommended engine oil types and service intervals:
Recommended Engine Oil
- Oil Type: SAE 10W-30 or 10W-40 (depending on climate and usage)
- Oil Capacity: Approximately 4.5 quarts (with filter change)
- Oil Filter: OEM or equivalent quality filter recommended
Service Intervals
Regular oil changes are essential for maintaining engine health. The following intervals are recommended:
- Oil Change Frequency: Every 3,000 to 5,000 miles, or every 3 to 6 months, whichever comes first.
- Filter Change: Replace the oil filter with every oil change.
- Inspection: Regularly check oil levels and condition, especially before long trips.
Conclusion
The Subaru EA81 engine is a testament to Subaru’s commitment to engineering reliable and efficient powertrains. Its unique boxer configuration, combined with straightforward maintenance requirements, makes it a popular choice for both everyday drivers and automotive enthusiasts. Understanding the specifications, engine configuration, and proper maintenance practices can help ensure that the EA81 continues to perform well for years to come. Whether you’re restoring a classic Subaru or simply maintaining your daily driver, knowledge of the EA81 engine will serve you well.
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