Mercury 250 Specs
Mercury 250 engine specs: 250 ci (4.1L), 6-cylinder, 3.6811" bore x 3.9094" stroke, 9:1 compression.
Dimensions
| Displacement | 250 ci / 4.1 L |
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| Bore | 3.6811" |
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| Stroke | 3.9094" |
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| Cylinders | 6 |
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| Compression ratio | 9:1 |
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| Bore/stroke ratio | 0.942 |
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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 | 155 hp |
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What these numbers mean
| Bore/stroke character | 0.942 — undersquare — stroke exceeds bore, which favours low-end torque |
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| Mean piston speed at 6,000 RPM | 3,909 ft/min — in the range typical of performance street engines |
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| Displacement per cylinder | 41.7 ci |
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| Static compression | 9:1 — low by modern standards, generally happy on regular pump fuel |
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Vehicles (3)
- Mercury Comet
- Mercury Montego
- Mercury Monarch
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