Mazda 12A Turbo Specs
Mazda 12A Turbo engine specs: 70 ci (1.146L), 2-cylinder, 4.1339" bore x 2.7559" stroke, 8.5:1 compression.
Dimensions
| Displacement | 70 ci / 1.146 L |
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| Bore | 4.1339" |
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| Stroke | 2.7559" |
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| Cylinders | 2 |
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| Compression ratio | 8.5:1 |
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| Bore/stroke ratio | 1.5 |
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Construction
| Block material | aluminum |
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| Head material | aluminum |
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| Valvetrain | Rotary |
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| Fuel type | gas |
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| Advertised HP | 160 hp |
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What these numbers mean
| Bore/stroke character | 1.500 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
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| Mean piston speed at 6,000 RPM | 2,756 ft/min — conservative for a street engine |
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| Displacement per cylinder | 35.0 ci |
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| Static compression | 8.5:1 — low by modern standards, generally happy on regular pump fuel |
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