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Subaru EA specs: 1.8L (108.7 ci) 4-cylinder, 92 x 67 mm (3.6220 x 2.6378 in) bore and stroke, 7.7:1 compression. Rated 95-115 hp. Rod ratio and piston speed.
The Subaru EA is oversquare — the 3.622" bore exceeds the 2.6378" stroke by 37.3% — a layout that favors airflow and RPM over leverage at the crank. The 2.6378" stroke does not reach 4,000 ft/min of mean piston speed until about 9,100 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 4 cylinders displaces 27.2 ci (445 cc).
7.7:1 on aluminum heads is low by modern standards and generally happy on regular pump fuel.
It is one of 10 engines in the EA family, sitting between the 59.6 ci and 110 ci members. 3 factory variants share these dimensions, rated from 95 to 115 hp. Factory fitments include the Subaru Leone Turbo, Subaru XT Turbo, Subaru Loyale Turbo and 6 others.
| Displacement | 108.7 ci / 1.8 L |
|---|---|
| Bore | 3.622" |
| Stroke | 2.6378" |
| Cylinders | 4 |
| Compression ratio | 7.7:1 |
| Bore/stroke ratio | 1.373 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | SOHC |
| Fuel type | gas |
| Advertised HP | 95–115 hp |
| Bore/stroke character | 1.373 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 2,638 ft/min — conservative for a street engine |
| Displacement per cylinder | 27.2 ci |
| Static compression | 7.7:1 — low by modern standards, generally happy on regular pump fuel |
Each link opens the calculator with this engine's specs already filled in.
These records share identical bore, stroke, displacement and compression. They differ by model year and factory power rating.
| Year | Advertised HP | Code |
|---|---|---|
| — | 95 hp | EA-81T |
| — | 111 hp | EA-82T |
| — | 115 hp | EA82T |