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Toyota A25A-FKS specs: 2.5L (152 ci) 4-cylinder, 87.5 x 103.4 mm (3.4449 x 4.0709 in) bore and stroke, 13:1 compression. Rated 203-206 hp, 2018–2025.
The Toyota A25A-FKS is undersquare — the 4.0709" stroke exceeds the 3.4449" bore by 15.4% — a layout that trades peak RPM for leverage and torque low in the range. The 4.0709" stroke puts mean piston speed at 4,000 ft/min around 5,900 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).
13:1 on aluminum heads is high for a production gasoline engine; running a ratio like that on pump fuel depends on chamber design and fuel delivery rather than the number alone.
It is one of 4 engines in the Toyota 152ci family, all of them 152 ci — the differences between them are in compression, heads and rating, not displacement. 16 factory variants share these dimensions, rated from 203 to 206 hp across 2018–2025.
| Displacement | 152 ci / 2.5 L |
|---|---|
| Bore | 3.4449" |
| Stroke | 4.0709" |
| Cylinders | 4 |
| Configuration | I4 |
| Compression ratio | 13:1 |
| Bore/stroke ratio | 0.846 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 203–206 hp |
| Years | 2018–2025 |
| Year | Version | HP @ rpm | Torque @ rpm | Comp. |
|---|---|---|---|---|
| 2018 | A25A-FKS net | 203 @ 6600 | 184 lb-ft @ 5000 | 13:1 |
| 2018 | A25A-FKS net | 206 @ 6600 | 186 lb-ft @ 5000 | 13:1 |
| 2019 | A25A-FKS net | 203 @ 6600 | 184 lb-ft @ 5000 | 13:1 |
| 2019 | A25A-FKS net | 206 @ 6600 | 186 lb-ft @ 5000 | 13:1 |
| 2020 | A25A-FKS net | 203 @ 6600 | 184 lb-ft @ 5000 | 13:1 |
| 2020 | A25A-FKS net | 206 @ 6600 | 186 lb-ft @ 5000 | 13:1 |
| 2021 | A25A-FKS net | 203 @ 6600 | 184 lb-ft @ 5000 | 13:1 |
| 2021 | A25A-FKS net | 206 @ 6600 | 186 lb-ft @ 5000 | 13:1 |
| 2022 | A25A-FKS net | 203 @ 6600 | 184 lb-ft @ 5000 | 13:1 |
| 2022 | A25A-FKS net | 206 @ 6600 | 186 lb-ft @ 5000 | 13:1 |
| 2023 | A25A-FKS net | 203 @ 6600 | 184 lb-ft @ 5000 | 13:1 |
| 2023 | A25A-FKS net | 206 @ 6600 | 186 lb-ft @ 5000 | 13:1 |
| 2024 | A25A-FKS net | 203 @ 6600 | 184 lb-ft @ 5000 | 13:1 |
| 2024 | A25A-FKS net | 206 @ 6600 | 186 lb-ft @ 5000 | 13:1 |
Factory specification sheet.
| Bore/stroke character | 0.846 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 4,071 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 38.0 ci |
| Static compression | 13:1 — high enough that pump premium or better is normally required |
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 |
|---|---|---|
| 2018 | 203 hp | A25A-FKS |
| 2018 | 206 hp | A25A-FKS |
| 2019 | 203 hp | A25A-FKS |
| 2019 | 206 hp | A25A-FKS |
| 2020 | 203 hp | A25A-FKS |
| 2020 | 206 hp | A25A-FKS |
| 2021 | — | A25A-FKS |
| 2021 | 203 hp | A25A-FKS |
| 2021 | 206 hp | A25A-FKS |
| 2022 | 203 hp | A25A-FKS |
| 2022 | 206 hp | A25A-FKS |
| 2023 | 203 hp | A25A-FKS |
| 2023 | 206 hp | A25A-FKS |
| 2024 | 203 hp | A25A-FKS |
| 2024 | 206 hp | A25A-FKS |
| 2025 | 203 hp | A25A-FKS |
4 factory vehicles, 2018–2025. Each year opens that model's engine table.