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Mercury Duratec 3.5 specs: 213 ci (3.5L) 6-cylinder, 3.642 x 3.413 in (92.5 x 86.7 mm) bore and stroke. Rated 290 hp, 2011–2019. Used in the Ford Explorer.
The Mercury Duratec 3.5 is oversquare — the 3.6417" bore exceeds the 3.4134" stroke by 6.7% — 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 35.5 ci (582 cc).
It is one of 12 engines in the Duratec family, sitting between the 140 ci and 227 ci members. 9 factory variants share these dimensions, rated at 290 hp across 2011–2019.
| Displacement | 213 ci / 3.5 L |
|---|---|
| Bore | 3.6417" |
| Stroke | 3.4134" |
| Cylinders | 6 |
| Configuration | V6 |
| Bore/stroke ratio | 1.067 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 290 hp |
| Years | 2011–2019 |
| Bore/stroke character | 1.067 — 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 | 35.5 ci |
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 |
|---|---|---|
| 2011 | 290 hp | Duratec 3.5 |
| 2012 | 290 hp | Duratec 3.5 |
| 2013 | 290 hp | Duratec 3.5 |
| 2014 | 290 hp | Duratec 3.5 |
| 2015 | 290 hp | Duratec 3.5 |
| 2016 | 290 hp | Duratec 3.5 |
| 2017 | 290 hp | Duratec 3.5 |
| 2018 | 290 hp | Duratec 3.5 |
| 2019 | 290 hp | Duratec 3.5 |