Subaru EK31 Specs
Subaru EK31 engine specs: 21.7 ci (0.356L), 2-cylinder, 2.4213" bore x 2.3622" stroke, 6.5:1 compression.
Dimensions
| Displacement | 21.7 ci / 0.356 L |
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| Bore | 2.4213" |
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| Stroke | 2.3622" |
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| Cylinders | 2 |
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| Compression ratio | 6.5:1 |
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| Bore/stroke ratio | 1.025 |
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Construction
| Block material | cast iron |
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| Head material | aluminum |
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| Valvetrain | 2-stroke |
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| Fuel type | gas |
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| Advertised HP | 16 hp |
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What these numbers mean
| Bore/stroke character | 1.025 — square — bore and stroke are within 5%, a balanced compromise |
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| Mean piston speed at 6,000 RPM | 2,362 ft/min — conservative for a street engine |
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| Displacement per cylinder | 10.8 ci |
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| Static compression | 6.5:1 — low by modern standards, generally happy on regular pump fuel |
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