Ford 152ci specs: 3.504 x 3.937 in (89 x 100 mm) bore and stroke, shared by all 3 versions. Displacement, compression and factory ratings, plus rod ratio.
| Displacement | 152 ci |
|---|---|
| Cylinders | 4 |
| Bore | 3.504" |
| Stroke | 3.937" |
| Compression | 9.7–13.0:1 |
| Advertised power | 168–209 hp |
| Years | 2009–2026 |
| Engine | Displacement | Bore × Stroke | CR | HP |
|---|---|---|---|---|
| Duratec 25 | 152 ci | 3.5039" × 3.937" | 9.7:1 | 168–175 |
| Duratec 25 Atkinson | 152 ci | 3.5039" × 3.937" | 12.3:1 | 177–191 |
| 2.5 Atkinson | 152 ci | 3.5039" × 3.937" | 13:1 | 192–209 |
Compression spans 9.7:1 to 13:1, so fuel requirements differ meaningfully between members — worth checking before assuming parts interchange.
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.