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Lincoln Duratec 20 Atkinson specs: 122 ci (2.0L) 4-cylinder, 3.445 x 3.272 in (87.5 x 83.1 mm) bore and stroke. Rated 188 hp, 2013–2020.
The Lincoln Duratec 20 Atkinson is oversquare — the 3.4449" bore exceeds the 3.2717" stroke by 5.3% — a layout that favors airflow and RPM over leverage at the crank. The 3.2717" stroke does not reach 4,000 ft/min of mean piston speed until about 7,350 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 4 cylinders displaces 30.5 ci (500 cc).
It is one of 15 engines in the EcoBoost family, the smallest at 122 ci. 8 factory variants share these dimensions, rated at 188 hp across 2013–2020.
| Displacement | 122 ci / 2 L |
|---|---|
| Bore | 3.4449" |
| Stroke | 3.2717" |
| Cylinders | 4 |
| Configuration | I4 |
| Bore/stroke ratio | 1.053 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 188 hp |
| Years | 2013–2020 |
| Year | Version | HP @ rpm | Torque @ rpm | Comp. |
|---|---|---|---|---|
| 2013 | net | 188 | 129 lb-ft @ 4000 | — |
| 2014 | net | 188 | 129 lb-ft @ 4000 | — |
| 2015 | net | 188 | 129 lb-ft @ 4000 | — |
| 2016 | net | 188 | 129 lb-ft @ 4000 | — |
| 2017 | net | 188 | 129 lb-ft @ 4000 | — |
| 2018 | net | 188 | 129 lb-ft @ 4000 | — |
| 2019 | net | 188 | 129 lb-ft @ 4000 | — |
| 2020 | net | 188 | 129 lb-ft @ 4000 | — |
Factory specification sheet.
| Bore/stroke character | 1.053 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,272 ft/min — conservative for a street engine |
| Displacement per cylinder | 30.5 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 |
|---|---|---|
| 2013 | 188 hp | Duratec 20 Atkinson |
| 2014 | 188 hp | Duratec 20 Atkinson |
| 2015 | 188 hp | Duratec 20 Atkinson |
| 2016 | 188 hp | Duratec 20 Atkinson |
| 2017 | 188 hp | Duratec 20 Atkinson |
| 2018 | 188 hp | Duratec 20 Atkinson |
| 2019 | 188 hp | Duratec 20 Atkinson |
| 2020 | 188 hp | Duratec 20 Atkinson |
1 factory vehicle, 2013–2020. Each year opens that model's engine table.