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Mercury Duratec 3.7 specs: 227 ci (3.7L) 6-cylinder, 3.76 x 3.413 in (95.5 x 86.7 mm) bore and stroke. Rated 304 hp, 2013–2019. Used in the Ford Explorer.
The Mercury Duratec 3.7 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).
It is one of 12 engines in the Duratec family, the largest at 227 ci. 7 factory variants share these dimensions, rated at 304 hp across 2013–2019.
| Displacement | 227 ci / 3.7 L |
|---|---|
| Bore | 3.7598" |
| Stroke | 3.4134" |
| Cylinders | 6 |
| Configuration | V6 |
| Bore/stroke ratio | 1.101 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 304 hp |
| Years | 2013–2019 |
| 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 |
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 |
|---|---|---|
| 2013 | 304 hp | Duratec 3.7 |
| 2014 | 304 hp | Duratec 3.7 |
| 2015 | 304 hp | Duratec 3.7 |
| 2016 | 304 hp | Duratec 3.7 |
| 2017 | 304 hp | Duratec 3.7 |
| 2018 | 304 hp | Duratec 3.7 |
| 2019 | 304 hp | Duratec 3.7 |