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Ford 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, 12.3:1 compression. Rated 188 hp, 2013–2020.
The Ford 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).
12.3:1 on aluminum heads is high for a production gasoline engine; running a ratio like that on pump fuel depends on chamber design and fuel delivery rather than the number alone.
It is one of 32 engines in the EcoBoost family, sitting between the 61 ci and 213.4 ci members. 16 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 |
| Compression ratio | 12.3:1 |
| 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 | — |
| 2014 | net | 188 | 129 lb-ft | — |
| 2015 | net | 188 | 129 lb-ft | — |
| 2016 | net | 188 | 129 lb-ft | — |
| 2017 | net | 188 | 129 lb-ft | — |
| 2018 | net | 188 | 129 lb-ft | — |
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 |
| Static compression | 12.3:1 — high enough that pump premium or better is normally required |
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 | — | Duratec 20 Atkinson |
| 2013 | 188 hp | Duratec 20 Atkinson |
| 2014 | — | Duratec 20 Atkinson |
| 2014 | 188 hp | Duratec 20 Atkinson |
| 2015 | — | Duratec 20 Atkinson |
| 2015 | 188 hp | Duratec 20 Atkinson |
| 2016 | — | Duratec 20 Atkinson |
| 2016 | 188 hp | Duratec 20 Atkinson |
| 2017 | — | Duratec 20 Atkinson |
| 2017 | 188 hp | Duratec 20 Atkinson |
| 2018 | — | Duratec 20 Atkinson |
| 2018 | 188 hp | Duratec 20 Atkinson |
| 2019 | — | Duratec 20 Atkinson |
| 2019 | 188 hp | Duratec 20 Atkinson |
| 2020 | — | Duratec 20 Atkinson |
| 2020 | 188 hp | Duratec 20 Atkinson |
1 factory vehicle, 2013–2020. Each year opens that model's engine table.