Subaru FB25 Specs
Subaru FB25 engine specs: 152.4 ci (2.498L), 4-cylinder, 3.7008" bore x 3.5433" stroke, 10.3:1 compression.
Dimensions
| Displacement | 152.4 ci / 2.498 L |
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| Bore | 3.7008" |
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| Stroke | 3.5433" |
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| Cylinders | 4 |
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| Compression ratio | 10.3:1 |
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| Bore/stroke ratio | 1.044 |
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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 | 170–182 hp |
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What these numbers mean
| Bore/stroke character | 1.044 — square — bore and stroke are within 5%, a balanced compromise |
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| Mean piston speed at 6,000 RPM | 3,543 ft/min — in the range typical of performance street engines |
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| Displacement per cylinder | 38.1 ci |
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| Static compression | 10.3:1 — in the range that usually runs on pump premium |
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Variants sharing these dimensions (2)
These records share identical bore, stroke, displacement and compression. They differ by model year and factory power rating.
| Year | Advertised HP | Code |
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| — | 170 hp | FB25 (NA), FB25, FB25D |
| — | 182 hp | FB25 |
Vehicles (3)
- Subaru Forester
- Subaru Outback
- Subaru Legacy
Similar engines
← All FB engines