Subaru EA engine

Infobox Automobile engine


name = Subaru EA-81
aka =
manufacturer = Fuji Heavy Industries
type = Flat-4
bore = 3.622 in (92 mm)
stroke = 2.638 in (67 mm)
displacement = 108.7 in³ (1781 cm³)
length =
diameter =
width =
height =
weight = 171 lb (78 kg)
block = Aluminum
head = Aluminum
valvetrain = OHV
supercharger =
turbocharger =
fuelsystem =
fueltype =
oilsystem =
coolingsystem = Watercooled
power = 73 hp (54 kW) @ 4800 RPM
specpower = 0.67 hp/in³ (30.30 kW/L)
torque = 94 ft·lbf (127 N·m) @ 2400 rpm
compression = 8.7:1
fuelcon =
specfuelcon =
oilcon =
power/weight =

The Subaru EA engine is a series of automobile internal combustion engines manufactured by Subaru, a division of Fuji Heavy Industries. All EA series engines are of a flat-4 design.

The EA series engines have aluminum heads with aluminum blocks. Each cyinder has two valves, one for exhaust and one for intake. They came in either an OHV pushrod or SOHC configuration.

Subaru produced the EA series from 1966 to 1994, and were found in the Subaru FF-1 and the Subaru Leone.

=EA-52=The Subaru EA-52 engine was produced from 1966-1970, and from 1970-1971 in the United States.

pecifications

* Displacement: 977.2 cm³
* Bore: 72 mm
* Stroke: 60 mm
* Compression Ratio: 9.0:1
* Valvetrain: OHV Pushrod
* Horsepower: 55@6000
* Torque: 57ft·lbf@3200

Found on

* Subaru 1000
* Subaru FF-1 Star

=EA-61=The Subaru EA-61 engine was produced from 1969 to 1972.

pecifications

* Displacement: 1088 cm³
* Bore: 76 mm
* Stroke: 60 mm
* Compression Ratio: 8.5:1
* Valvetrain: OHV Pushrod
* Horsepower: 61@5600
* Torque: 65ft·lbf@4000

Found on

* Subaru FF-1 Star
* Subaru G

=EA-62=The Subaru EA-62 engine was produced from 1971 to 1972. It is the only EA- engine with rear facing exhaust ports.

pecifications

* Displacement: 1267.5 cm³
* Bore: 82 mm
* Stroke: 60 mm
* Compression Ratio: 9.0:1
* Valvetrain: OHV Pushrod
* Horsepower: 80@6400
* Torque: 73ft·lbf@4000

Found on

* Subaru G (1300G in United States)

=EA-63=The Subaru EA-63 engine was produced from 1973 to 1976.

pecifications

* Displacement: 1361 cm³
* Bore: 85 mm
* Stroke: 60 mm
* Compression Ratio: 8.5:1
* Valvetrain: OHV Pushrod
* Horsepower: 58@5200
* Torque: 68ft·lbf@2400

Found on

* 1974-1976 Subaru Leone

=EA-71=The Subaru EA-71 engine was produced from 1976 to 1987, and was a redesign of the EA-63 block.

pecifications

* Displacement: 1595 cm³
* Bore: 92 mm
* Stroke: 60 mm
* Compression Ratio: 9.0:1
* Valvetrain: OHV Pushrod
* Horsepower: 1976-1979: 67@5200 1980-1987: 68@4800
* Torque: 1976-1979: 81ft·lbf@2400 1980-1987: 84ft·lbf@2800

Found on

* 1976-1987 Subaru Leone
* 1978-1980 Subaru BRAT

=EA-81=

The Subaru EA-81 engine was produced from 1980 to 1989 and is a stroked version of the EA-71.

pecifications

* Displacement: 1781 cm³
* Bore: 92 mm
* Stroke: 67 mm
* Compression Ratio: 8.7:1
* Valvetrain: OHV Pushrod
* Horsepower: 73@4800
* Torque: 94ft·lbf@2400

Found On

* 1980-1989 Subaru Leone
* 1981-1987 Subaru BRAT

EA-81T

The EA-81T is not an official engine designation from Subaru. The T is used informally to refer to the turbo-supercharger configuration of EA-81 engines that are equipped with a turbocharger and multi port fuel injection.

Additional Specifications

* Compression Ratio: 7.7:1
* Supercharging Pressure: 7 psi
* Horsepower: 95@4200
* Torque: 123ft·lbf@2800

Found on

* 1983-1984 Subaru Leone
* 1983-1984 Subaru BRAT

=EA-72 Concept Engine=

There was an unreleased EA-72 concept engine Subaru developed for use in the Japanese Market in 1989. It was essentially an EA-82 with an EA-71 crankshaft. This engine never came about as the Subaru EJ15 and EJ16 were already in development for this purpose.

pecifications

* Displacement: 1595 cm³
* Bore: 92 mm
* Stroke: 60 mm
* Compression Ratio: 8.7:1
* Valvetrain: SOHC
* Horsepower: unreleased
* Torque: unreleased

=EA-82=

The Subaru EA-82 engine was produced from 1985 to 1994. It was a complete redesign of the EA platform, and shares very few parts with previous EA Engines. It came with a carburetor, single point fuel injection, or multi port fuel injection.

pecifications

* Displacement: 1781 cm³
* Bore: 92 mm
* Stroke: 67 mm
* Compression Ratio: 8.7:1 or 9.0:1 SPFI
* Valvetrain: SOHC
* Horsepower: Carb - 84@5200, SPFI - 90@5600, MPFI - 97@5200
* Torque: Carb - 101ft·lbf@3200, SPFI - 101ft·lbf@2300, MPFI - 103ft·lbf@3200

Found On

* 1985-1994 Subaru Leone
* 1985-1991 Subaru Alcyone

EA-82T

The EA-82T engine was introduced in 1985 for the GL-10 models. It is an MPFI EA-82 with modified cylinder heads and lower compression pistons.

Additional Specifications

* Turbo: IHI Corporation model RHB5 VF7
* Compression Ratio: 7.7:1
* Supercharging Pressure: 7 psi
* Horsepower: 111@5200
* Torque: 134ft·lbf@2800

=ER-27=

The ER-27 engine was produced from 1988-1991. It is technically not an EA engine, although it is a 6 cylinder version of the EA-82. Many parts will interchange. There was never a factory turbo version of this engine.

pecifications

* Displacement: 2672 cm³
* Bore: 92 mm
* Stroke: 67 mm
* Compression Ratio: 9.5:1
* Valvetrain: SOHC
* Horsepower: 145@5200
* Torque: 156ft·lbf@4000

Found on

* 1988-1991 Subaru Alcyone (XT-6 in the United States/Alcyone VX in Australia).

References

* 1977 Subaru Factory Service Manual
* 1983 Subaru Factory Service Manual
* 1984 Subaru Factory Service Manual
* [http://www.drive.subaru.com Subaru Drive Magazine]
* [http://www.vintagesubaruparts.com/engineid.htm Vintage Subaru Parts]