Subaru EJ257 Specs
Subaru EJ257 engine specs: 150.2 ci (2.5L), 4-cylinder, 3.9173" bore x 3.1102" stroke, 8.2:1 compression.
Dimensions
| Displacement | 150.2 ci / 2.5 L |
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| Bore | 3.9173" |
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| Stroke | 3.1102" |
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| Cylinders | 4 |
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| Compression ratio | 8.2:1 |
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| Bore/stroke ratio | 1.26 |
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Construction
| Block material | aluminum |
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| Head material | aluminum |
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| Valvetrain | DOHC |
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| Fuel type | gas |
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| Advertised HP | 300 hp |
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What these numbers mean
| Bore/stroke character | 1.260 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
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| Mean piston speed at 6,000 RPM | 3,110 ft/min — conservative for a street engine |
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| Displacement per cylinder | 37.5 ci |
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| Static compression | 8.2:1 — low by modern standards, generally happy on regular pump fuel |
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