Opel 1975 115 81HP Specs
Opel 1975 115 81HP engine specs: 115 ci (1.9L), 4-cylinder, 3.66" bore x 2.75" stroke, 8.02:1 compression.
Dimensions
| Displacement | 115 ci / 1.9 L |
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| Bore | 3.66" |
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| Stroke | 2.75" |
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| Cylinders | 4 |
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| Configuration | I4 |
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| Compression ratio | 8.02:1 |
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| Rod length | 5.04" |
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| Rod ratio | 1.833 |
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| Bore/stroke ratio | 1.331 |
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| Piston deck clearance | 0.028" |
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Construction
| Block material | cast iron |
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| Head material | aluminum |
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| Valvetrain | OHC |
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| Fuel type | gas |
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| Advertised HP | 81 hp |
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| Years | 1975 |
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What these numbers mean
| Bore/stroke character | 1.331 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
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| Mean piston speed at 6,000 RPM | 2,750 ft/min — conservative for a street engine |
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| Rod ratio | 1.833 — long — less side loading on the cylinder wall, favours high RPM |
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| Displacement per cylinder | 28.8 ci |
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| Static compression | 8.02:1 — low by modern standards, generally happy on regular pump fuel |
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Cylinder head
| Chamber volume | 46 cc |
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| Rocker ratio | 1.4:1 |
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| Lifter type | mechanical |
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Similar engines
Source: NHRA blueprints — nhra.net blueprints
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