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Mercury 3 7 Duratec V6 specs: 227 ci (3.7L) 6-cylinder, 3.76 x 3.413 in (95.5 x 86.7 mm) bore and stroke, 10.5:1 compression. Rated 305 hp. DOHC.
The Mercury 3 7 Duratec V6 is oversquare — the 3.7598" bore exceeds the 3.4134" stroke by 10.1% — a layout that favors airflow and RPM over leverage at the crank. The 3.4134" stroke does not reach 4,000 ft/min of mean piston speed until about 7,050 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 6 cylinders displaces 37.8 ci (620 cc).
10.5:1 on aluminum heads is in the range that usually runs on pump premium; aluminum sheds heat faster than iron, which makes the same number a little more forgiving.
It is one of 12 engines in the Duratec family, the largest at 227 ci. Factory fitments include the Mercury Mountaineer.
| Displacement | 227 ci / 3.7 L |
|---|---|
| Bore | 3.7598" |
| Stroke | 3.4134" |
| Cylinders | 6 |
| Compression ratio | 10.5:1 |
| Bore/stroke ratio | 1.101 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 305 hp |
| Bore/stroke character | 1.101 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,413 ft/min — conservative for a street engine |
| Displacement per cylinder | 37.8 ci |
| Static compression | 10.5:1 — in the range that usually runs on pump premium |
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