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Mercury Duratec specs: 182 ci (3.0L) 6-cylinder, 3.504 x 3.13 in (89 x 79.5 mm) bore and stroke, 10:1 compression. Rated 200-240 hp. DOHC.
The Mercury Duratec is oversquare — the 3.504" bore exceeds the 3.13" stroke by 11.9% — a layout that favors airflow and RPM over leverage at the crank. The 3.13" stroke does not reach 4,000 ft/min of mean piston speed until about 7,650 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 6 engines in the Duratec family, sitting between the 140 ci and 213 ci members. 3 factory variants share these dimensions, rated from 200 to 240 hp. Factory fitments include the Mercury Sable, Mercury Milan, Mercury Mariner and 5 others.
| Displacement | 182 ci / 3 L |
|---|---|
| Bore | 3.504" |
| Stroke | 3.13" |
| Cylinders | 6 |
| Compression ratio | 10:1 |
| Bore/stroke ratio | 1.119 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 200–240 hp |
| Bore/stroke character | 1.119 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,130 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 |
Each link opens the calculator with this engine's specs already filled in.
These records share identical bore, stroke, displacement and compression. They differ by model year and factory power rating.
| Year | Advertised HP | Code |
|---|---|---|
| — | 200 hp | 3.0L V6 |
| — | 200 hp | 3.0L Duratec 30, Duratec 30, 3.0L Duratec, 3.0L, 3.0L FlexFuel, 3.0L V6, 3.0 V6, 3.0 V6 Flex Fuel |
| — | 240 hp | 3.0L Duratec FlexFuel |