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Mercury 3.0L Duratec FlexFuel specs: 182 ci (3.0L) 6-cylinder, 3.50 x 3.197 in (88.9 x 81.2 mm) bore and stroke, 10:1 compression. Rated 240 hp. DOHC.
The Mercury 3.0L Duratec FlexFuel is oversquare — the 3.5" bore exceeds the 3.1969" stroke by 9.5% — a layout that favors airflow and RPM over leverage at the crank. The 3.1969" stroke does not reach 4,000 ft/min of mean piston speed until about 7,500 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 6 cylinders displaces 30.3 ci (497 cc).
10:1 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, sitting between the 140 ci and 227 ci members. Factory fitments include the Mercury Milan, Mercury Mariner.
| Displacement | 182 ci / 3 L |
|---|---|
| Bore | 3.5" |
| Stroke | 3.1969" |
| Cylinders | 6 |
| Compression ratio | 10:1 |
| Bore/stroke ratio | 1.095 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 240 hp |
| Bore/stroke character | 1.095 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,197 ft/min — conservative for a street engine |
| Displacement per cylinder | 30.3 ci |
| Static compression | 10:1 — in the range that usually runs on pump premium |
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