Pontiac Ponti 1977 151 87HP Specs
Pontiac Ponti 1977 151 87HP engine specs: 151 ci (2.5L), 4-cylinder, 4.002" bore x 3.01" stroke, 9.251:1 compression.
Dimensions
| Displacement | 151 ci / 2.5 L |
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| Bore | 4.002" |
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| Stroke | 3.01" |
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| Cylinders | 4 |
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| Configuration | I4 |
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| Compression ratio | 9.251:1 |
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| Rod length | 6.05" |
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| Rod ratio | 2.01 |
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| Bore/stroke ratio | 1.33 |
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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 | 87 hp |
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| Years | 1977 |
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What these numbers mean
| Bore/stroke character | 1.330 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
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| Mean piston speed at 6,000 RPM | 3,010 ft/min — conservative for a street engine |
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| Rod ratio | 2.01 — long — less side loading on the cylinder wall, favours high RPM |
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| Displacement per cylinder | 37.8 ci |
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| Static compression | 9.251:1 — low by modern standards, generally happy on regular pump fuel |
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Cylinder head
| Intake valve diameter | 1.72" |
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| Exhaust valve diameter | 1.5" |
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