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Ford Duratec 20 specs: 122 ci (2.0L) 4-cylinder, 3.445 x 3.272 in (87.5 x 83.1 mm) bore and stroke. Rated 136-140 hp, 2005–2011. Used in the Ford Focus.
The Ford Duratec 20 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 6 engines in the Ford 122ci family, all of them 122 ci — the differences between them are in compression, heads and rating, not displacement. 7 factory variants share these dimensions, rated from 136 to 140 hp across 2005–2011.
| Displacement | 122 ci / 2 L |
|---|---|
| Bore | 3.4449" |
| Stroke | 3.2717" |
| Cylinders | 4 |
| Configuration | I4 |
| Bore/stroke ratio | 1.053 |
| Fuel type | gas |
|---|---|
| Advertised HP | 136–140 hp |
| Years | 2005–2011 |
| Year | Version | HP @ rpm | Torque @ rpm | Comp. |
|---|---|---|---|---|
| 2005 | net | 136 @ 6000 * | 133 lb-ft @ 4500 * | — |
| 2006 | net | 136 @ 6000 | 136 lb-ft @ 4250 | — |
| 2008 | net | 140 @ 6000 | 136 lb-ft @ 4250 | — |
| 2009 | net | 140 @ 6000 | 136 lb-ft @ 4250 | — |
| 2010 | net | 140 @ 6000 | 136 lb-ft @ 4250 | — |
| 2011 | net | 140 @ 6000 | 136 lb-ft @ 4250 | — |
Factory specification sheet. * Not yet cross-verified.
| 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 |
|---|---|---|
| 2005 | 136 hp | Duratec 20 |
| 2006 | 136 hp | Duratec 20 |
| 2007 | 136 hp | Duratec 20 |
| 2008 | 140 hp | Duratec 20 |
| 2009 | 140 hp | Duratec 20 |
| 2010 | 140 hp | Duratec 20 |
| 2011 | 140 hp | Duratec 20 |
1 factory vehicle, 2005–2018. Each year opens that model's engine table.