Bore, stroke, displacement and compression for all 2 Mercury Duratec Hybrid engines, compared side by side. Plus rod ratio and head specs where published.
| Displacement | 140–152 ci |
|---|---|
| Cylinders | 4 |
| Bore | 3.445–3.504" |
| Stroke | 3.701–3.937" |
| Compression | 12.1–12.3:1 |
| Advertised power | 133–155 hp |
| Engine | Displacement | Bore × Stroke | CR | HP |
|---|---|---|---|---|
| 2.5L I4 Hybrid | 152 ci | 3.5039" × 3.937" | 12.3:1 | 155 |
| 2.3L I4 Hybrid | 140 ci | 3.4449" × 3.7008" | 12.1:1 | 133 |
Both bore and stroke vary across the family, so these are separate castings rather than variations on one block.
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.