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Ford Duratec 23 Atkinson specs: 140 ci (2.3L) 4-cylinder, 3.445 x 3.701 in (87.5 x 94 mm) bore and stroke. Rated 155 hp, 2008. Used in the Ford Escape. DOHC.
The Ford Duratec 23 Atkinson is undersquare — the 3.7008" stroke exceeds the 3.4449" bore by 6.9% — a layout that trades peak RPM for leverage and torque low in the range. The 3.7008" stroke puts mean piston speed at 4,000 ft/min around 6,500 RPM, which is where a production bottom end is generally considered at its limit. Each of the 4 cylinders displaces 35.0 ci (574 cc).
It is one of 32 engines in the EcoBoost family, sitting between the 61 ci and 213.4 ci members.
| Displacement | 140 ci / 2.3 L |
|---|---|
| Bore | 3.4449" |
| Stroke | 3.7008" |
| Cylinders | 4 |
| Configuration | I4 |
| Bore/stroke ratio | 0.931 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 155 hp |
| Years | 2008 |
| Bore/stroke character | 0.931 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,701 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 35.0 ci |
Each link opens the calculator with this engine's specs already filled in.
1 factory vehicle, 2008. Each year opens that model's engine table.