Buick 173ci 9.2:1 Specs
Buick Buick 173ci · 3.500" × 3.000" · 9.2:1 engine specs: 173 ci (2.8L), 6-cylinder, 3.5" bore x 3" stroke, 9.2:1 compression.
Dimensions
| Displacement | 173 ci / 2.8 L |
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| Bore | 3.5" |
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| Stroke | 3" |
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| Cylinders | 6 |
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| Configuration | I6 |
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| Compression ratio | 9.2:1 |
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| Rod length | 5.7" |
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| Rod ratio | 1.9 |
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| Bore/stroke ratio | 1.167 |
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| Piston deck clearance | 0.015" |
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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 | 125–130 hp |
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| Years | 1988 |
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What these numbers mean
| Bore/stroke character | 1.167 — 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 | 1.9 — 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 | 9.2:1 — low by modern standards, generally happy on regular pump fuel |
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Cylinder head
| Intake valve diameter | 1.725" |
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| Exhaust valve diameter | 1.43" |
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| Chamber volume | 51 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 (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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| 1988 | 125 hp | — |
| 1988 | 130 hp | — |
Similar engines
Source: NHRA blueprints — nhra.net blueprints
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