American Motors 199ci 8.5:1 Specs
American Motors American Motors 199ci · 3.75" × 3" · 8.5:1 engine specs: 199 ci (3.3L), 6-cylinder, 3.75" bore x 3" stroke, 8.5:1 compression.
Dimensions
| Displacement | 199 ci / 3.3 L |
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| Bore | 3.75" |
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| Stroke | 3" |
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| Cylinders | 6 |
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| Compression ratio | 8.5:1 |
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| Rod length | 6.125" |
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| Rod ratio | 2.042 |
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| Bore/stroke ratio | 1.25 |
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| Piston deck clearance | 0.045" |
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Construction
| Induction | 1-1 |
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| Advertised HP | 128 hp |
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| Years | 1965–1970 |
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What these numbers mean
| Bore/stroke character | 1.250 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
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| Mean piston speed at 6,000 RPM | 3,000 ft/min — conservative for a street engine |
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| Rod ratio | 2.042 — long — less side loading on the cylinder wall, favours high RPM |
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| Displacement per cylinder | 33.2 ci |
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| Static compression | 8.5:1 — low by modern standards, generally happy on regular pump fuel |
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Cylinder head
| Intake valve diameter | 1.787" |
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| Exhaust valve diameter | 1.406" |
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| Chamber volume | 53.5 cc |
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| Rocker ratio | 1.5:1 |
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| Lifter type | hydraulic |
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Variants sharing these dimensions (6)
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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| 1965 | 128 hp | — |
| 1966 | 128 hp | — |
| 1967 | 128 hp | — |
| 1968 | 128 hp | — |
| 1969 | 128 hp | — |
| 1970 | 128 hp | — |
Similar engines
Source: NHRA blueprints — nhra.net blueprints
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