See other engines in this family
The same engine also has a main page: Ford Duratec 37.
Lincoln Duratec 37 specs: 227 ci (3.7L) 6-cylinder, 3.76 x 3.413 in (95.5 x 86.7 mm) bore and stroke. Rated 305 hp, 2011–2015. Used in the Lincoln MKX. DOHC.
The Lincoln Duratec 37 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 9 engines in the Duratec family, the largest at 227 ci. 5 factory variants share these dimensions, rated at 305 hp across 2011–2015.
| 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 | 305 hp |
| Years | 2011–2015 |
| Year | Version | HP @ rpm | Torque @ rpm | Comp. |
|---|---|---|---|---|
| 2011 | net | 305 @ 6500 | 280 lb-ft @ 4000 | — |
| 2012 | net | 305 @ 6500 | 280 lb-ft @ 4000 | — |
| 2013 | net | 305 @ 6500 | 280 lb-ft @ 4000 | — |
| 2014 | net | 305 @ 6500 | 280 lb-ft @ 4000 | — |
Factory specification sheet.
| 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 |
|---|---|---|
| 2011 | 305 hp | Duratec 37 |
| 2012 | 305 hp | Duratec 37 |
| 2013 | 305 hp | Duratec 37 |
| 2014 | 305 hp | Duratec 37 |
| 2015 | 305 hp | Duratec 37 |
3 factory vehicles, 2011–2016. Each year opens that model's engine table.