Ford 255ci 9.212:1 Specs
Ford Ford 255ci · 3.681" × 3.000" · 9.212:1 engine specs: 255 ci (4.2L), 8-cylinder, 3.681" bore x 3" stroke, 9.212:1 compression.
Dimensions
| Displacement | 255 ci / 4.2 L |
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| Bore | 3.681" |
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| Stroke | 3" |
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| Cylinders | 8 |
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| Configuration | V8 |
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| Compression ratio | 9.212:1 |
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| Rod length | 5.09" |
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| Rod ratio | 1.697 |
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| Bore/stroke ratio | 1.227 |
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| Piston deck clearance | 0.0005" |
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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 | 111–122 hp |
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| Years | 1980–1982 |
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What these numbers mean
| Bore/stroke character | 1.227 — 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 | 1.697 — moderate — the range most production V8s fall in |
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| Displacement per cylinder | 31.9 ci |
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| Static compression | 9.212:1 — low by modern standards, generally happy on regular pump fuel |
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Cylinder head
| Intake valve diameter | 1.68" |
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| Exhaust valve diameter | 1.45" |
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Variants sharing these dimensions (5)
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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| 1980 | 115 hp | — |
| 1981 | 115 hp | — |
| 1981 | 120 hp | — |
| 1982 | 111 hp | — |
| 1982 | 122 hp | — |
Similar engines
Source: NHRA blueprints — nhra.net blueprints
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