Mercury 4.0 SOHC Specs
Mercury 4.0 SOHC engine specs: 245 ci (4L), 6-cylinder, 3.9528" bore x 3.3228" stroke, 9.7:1 compression.
Dimensions
| Displacement | 245 ci / 4 L |
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| Bore | 3.9528" |
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| Stroke | 3.3228" |
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| Cylinders | 6 |
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| Compression ratio | 9.7:1 |
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| Bore/stroke ratio | 1.19 |
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Construction
| Block material | cast iron |
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| Head material | aluminum |
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| Valvetrain | SOHC |
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| Fuel type | gas |
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| Advertised HP | 210 hp |
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What these numbers mean
| Bore/stroke character | 1.190 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
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| Mean piston speed at 6,000 RPM | 3,323 ft/min — conservative for a street engine |
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| Displacement per cylinder | 40.8 ci |
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| Static compression | 9.7:1 — in the range that usually runs on pump premium |
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