Oldsmobile 138ci 11.9:1 Specs
Oldsmobile Oldsmobile 138ci · 3.625" × 3.350" · 11.9:1 engine specs: 138 ci (2.3L), 4-cylinder, 3.625" bore x 3.35" stroke, 11.9:1 compression.
Dimensions
| Displacement | 138 ci / 2.3 L |
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| Bore | 3.625" |
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| Stroke | 3.35" |
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| Cylinders | 4 |
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| Configuration | I4 |
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| Compression ratio | 11.9:1 |
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| Rod length | 5.81" |
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| Rod ratio | 1.734 |
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| Bore/stroke ratio | 1.082 |
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Construction
| Block material | cast iron |
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| Head material | cast iron |
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| Valvetrain | OHV |
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| Fuel type | gas |
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| Advertised HP | 180 hp |
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| Years | 1990–1991 |
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What these numbers mean
| Bore/stroke character | 1.082 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
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| Mean piston speed at 6,000 RPM | 3,350 ft/min — conservative for a street engine |
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| Rod ratio | 1.734 — moderate — the range most production V8s fall in |
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| Displacement per cylinder | 34.5 ci |
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| Static compression | 11.9:1 — high enough that pump premium or better is normally required |
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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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| 1990 | 180 hp | — |
| 1991 | 180 hp | — |
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