Ford 138ci specs: 3.444 x 3.70 in (87.5 x 94 mm) bore and stroke, shared by all 5 versions. Displacement, compression and factory ratings, plus rod ratio.
| Displacement | 138 ci |
|---|---|
| Cylinders | 4 |
| Bore | 3.444" |
| Stroke | 3.700" |
| Compression | 9.4–9.5:1 |
| Advertised power | 143–330 hp |
| Years | 2005–2026 |
| Engine | Displacement | Bore × Stroke | CR | HP |
|---|---|---|---|---|
| 2.3 EcoBoost | 138 ci | 3.444" × 3.7" | — | 310–315 |
| 2.3 EcoBoost High Performance Package | 138 ci | 3.444" × 3.7" | — | 330 |
| Duratec DOHC 16V I4 | 138 ci | 3.444" × 3.7" | — | 143 |
| Ford 138ci · 3.444" × 3.7" · 9.5:1 | 138 ci | 3.444" × 3.7" | 9.5:1 | 264 |
| Ford 138ci · 3.444" × 3.7" · 9.4:1 | 138 ci | 3.444" × 3.7" | 9.4:1 | 298 |
All are undersquare — stroke larger than bore, favouring torque low in the range.
Each engine page carries rod ratio, mean piston speed, bore/stroke character and cylinder head specs where published, and links into the calculators with its dimensions already filled in.