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Mazda SKYACTIV-G 2.5 Turbo specs: 2.5L (152 ci) 4-cylinder, 89 x 100 mm (3.5039 x 3.9370 in) bore and stroke, 10.5:1 compression. Rated 250 hp, 2021–2026.
The Mazda SKYACTIV-G 2.5 Turbo is undersquare — the 3.937" stroke exceeds the 3.5039" bore by 11.0% — a layout that trades peak RPM for leverage and torque low in the range. The 3.937" stroke puts mean piston speed at 4,000 ft/min around 6,100 RPM, which is where a production bottom end is generally considered at its limit. Each of the 4 cylinders displaces 38.0 ci (623 cc).
10.5:1 on aluminum heads is in the range that usually runs on pump premium; aluminum sheds heat faster than iron, which makes the same number a little more forgiving.
It is one of 19 engines in the Skyactiv-G family, sitting between the 91.3 ci and 201.4 ci members. 6 factory variants share these dimensions, rated at 250 hp across 2021–2026.
| Displacement | 152 ci / 2.5 L |
|---|---|
| Bore | 3.5039" |
| Stroke | 3.937" |
| Cylinders | 4 |
| Configuration | I4 |
| Compression ratio | 10.5:1 |
| Bore/stroke ratio | 0.89 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Redline | 6,300 rpm (factory limit) |
| Advertised HP | 250 hp |
| Years | 2021–2026 |
| Year | Version | HP @ rpm | Torque @ rpm | Comp. |
|---|---|---|---|---|
| 2021 | SKYACTIV-G 2.5 Turbo net | 250 @ 5000 | 320 lb-ft @ 2500 | 10.5:1 |
| 2022 | SKYACTIV-G 2.5 Turbo net | 250 @ 5000 | 320 lb-ft @ 2500 | 10.5:1 |
| 2023 | SKYACTIV-G 2.5 Turbo net | 250 @ 5000 | 320 lb-ft @ 2500 | 10.5:1 |
| 2024 | SKYACTIV-G 2.5 Turbo net | 250 @ 5000 | 320 lb-ft @ 2500 | 10.5:1 |
| 2025 | SKYACTIV-G 2.5 Turbo net | 250 @ 5000 | 320 lb-ft @ 2500 | 10.5:1 |
Factory specification sheet.
| Bore/stroke character | 0.890 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,937 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 38.0 ci |
| Static compression | 10.5:1 — in the range that usually runs on pump premium |
Each link opens the calculator with this engine's specs already filled in.
These records share identical bore, stroke, displacement and compression. They differ by model year and factory power rating.
| Year | Advertised HP | Code |
|---|---|---|
| 2021 | 250 hp | SKYACTIV-G 2.5 Turbo |
| 2022 | 250 hp | SKYACTIV-G 2.5 Turbo |
| 2023 | 250 hp | SKYACTIV-G 2.5 Turbo |
| 2024 | 250 hp | SKYACTIV-G 2.5 Turbo |
| 2025 | 250 hp | SKYACTIV-G 2.5 Turbo |
| 2026 | 250 hp | SKYACTIV-G 2.5 Turbo |
1 factory vehicle, 2021–2026. Each year opens that model's engine table.