Subaru 24 NA Specs
Subaru 24 NA engine specs: 145.7 ci (2.4L), 4-cylinder, 3.7008" bore x 3.3858" stroke, 12.5:1 compression.
Dimensions
| Displacement | 145.7 ci / 2.4 L |
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| Bore | 3.7008" |
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| Stroke | 3.3858" |
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| Cylinders | 4 |
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| Compression ratio | 12.5:1 |
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| Bore/stroke ratio | 1.093 |
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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 | 228 hp |
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What these numbers mean
| Bore/stroke character | 1.093 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
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| Mean piston speed at 6,000 RPM | 3,386 ft/min — conservative for a street engine |
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| Displacement per cylinder | 36.4 ci |
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| Static compression | 12.5:1 — high enough that pump premium or better is normally required |
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