See other engines in this family
The same engine also has a main page: Ford Duratec 20.
Mercury Duratec 20 specs: 122 ci (2.0L) 4-cylinder, 3.445 x 3.272 in (87.5 x 83.1 mm) bore and stroke. Used in the Ford Focus. Rod ratio and piston speed.
The Mercury 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 11 engines in the Duratec family, the smallest at 122 ci.
| Displacement | 122 ci / 2 L |
|---|---|
| Bore | 3.4449" |
| Stroke | 3.2717" |
| Cylinders | 4 |
| Bore/stroke ratio | 1.053 |
| Fuel type | gas |
|---|
| 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.
1 factory vehicle, 2005–2018. Each year opens that model's engine table.