Subaru · EA Boxer
Subaru EA81 1.8
The durable pushrod 1.8-liter boxer used in GL, Brat and early Leone-era Subaru vehicles.
108.7
Cubic inches
The EA81 earned a durability reputation in early Subaru 4WD cars and pickups and remains one of the simplest classic Subaru boxer engines to service.
Displacement
108.7 ci
Bore
3.622"
Stroke
2.638"
Years
1980–1994 family/application era
Key Takeaway
The EA81 was a simple aluminum boxer four with pushrod OHV valvetrain and a 1.8-liter displacement. Its relatively short 2.638-inch stroke, low engine height, and straightforward construction made it durable and easy to service in early Subaru 4WD vehicles.
Technical Specifications
- Horsepower
- Varies by year/application; see documented variants
- Torque
- 94 lb-ft @ 2400 rpm in representative naturally aspirated EA81 specification
- Architecture
- Horizontally opposed boxer four
- Block
- Aluminum
- Cylinder heads
- Aluminum
- Valvetrain
- OHV, 2 valves per cylinder
- Aspiration
- Naturally aspirated; turbocharged EA81T existed in limited applications
- Fuel delivery
- Carbureted; fuel injection/turbo in selected variants
The EA81 was a simple aluminum boxer four with pushrod OHV valvetrain and a 1.8-liter displacement. Its relatively short 2.638-inch stroke, low engine height, and straightforward construction made it durable and easy to service in early Subaru 4WD vehicles.
Internal Specifications
Variant-specific values are labeled. Engine families that span multiple years or RPOs can have different heads, cams, induction and rotating parts, so the exact code/year always takes priority.
Notable Applications
Strengths
- Simple pushrod valvetrain
- Good low-speed durability
- Compact boxer packaging
Weaknesses / Watch-outs
- Limited airflow
- Aging cooling and sealing systems
- Performance parts are niche
Common Upgrades
- Weber carburetor conversion
- Exhaust
- Electronic ignition
Racing History & Legacy
The EA81 became one of the classic old-school Subaru engines, remembered for simple pushrod construction and long service life in early 4WD cars and pickups.
References & Image Credit
Engine image: Ferjim · Public domain · source
Engineering Notes Worth Knowing
1.781 L / 108.7 cu in with 3.622 x 2.638-inch bore and stroke.
Aluminum boxer four with OHV two-valve cylinder heads.
Naturally aspirated carbureted versions were most common; limited turbo and injected variants also existed.
Used in Leone/GL, BRAT, DL, and Touring Wagon applications.
History · context · related reading
The Story Behind Subaru EA81 1.8
The EA81 powered the era when Subaru’s four-wheel-drive cars and BRAT built the company’s rugged reputation. It was not sophisticated, but its simplicity matched the durable, practical personality of those early Subarus.
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