Ram Magnum 9.1:1 Specs
Ram Magnum · 3.909" × 3.311" · 9.1:1 engine specs: 239 ci (3.9L), 6-cylinder, 3.9094" bore x 3.311" stroke, 9.1:1 compression.
Dimensions
| Displacement | 239 ci / 3.9 L |
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| Bore | 3.9094" |
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| Stroke | 3.311" |
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| Cylinders | 6 |
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| Compression ratio | 9.1:1 |
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| Bore/stroke ratio | 1.181 |
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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 | 175 hp |
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What these numbers mean
| Bore/stroke character | 1.181 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
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| Mean piston speed at 6,000 RPM | 3,311 ft/min — conservative for a street engine |
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| Displacement per cylinder | 39.8 ci |
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| Static compression | 9.1:1 — low by modern standards, generally happy on regular pump fuel |
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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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| — | 175 hp | LA 3.9L |
| — | 175 hp | Magnum 3.9, 3.9L V6, 3.9L Magnum, EHG |
Vehicles (3)
- Ram 1500
- Dodge Dakota
- Dodge Ram 1500
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