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Kia G4KP specs: 2.5L (152.4 ci) 4-cylinder, 88.5 x 101.5 mm (3.4843 x 3.9961 in) bore and stroke, 10.5:1 compression. Rated 290 hp, 2021–2026.
The Kia G4KP is undersquare — the 3.9961" stroke exceeds the 3.4843" bore by 12.8% — a layout that trades peak RPM for leverage and torque low in the range. The 3.9961" stroke puts mean piston speed at 4,000 ft/min around 6,000 RPM, which is where a production bottom end is generally considered at its limit. Each of the 4 cylinders displaces 38.1 ci (624 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 2 engines in the Kia 152ci family, all of them 152.4 ci — the differences between them are in compression, heads and rating, not displacement. 6 factory variants share these dimensions, rated at 290 hp across 2021–2026.
| Displacement | 152.4 ci / 2.5 L |
|---|---|
| Bore | 3.4843" |
| Stroke | 3.9961" |
| Cylinders | 4 |
| Configuration | I4 |
| Compression ratio | 10.5:1 |
| Bore/stroke ratio | 0.872 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 290 hp |
| Years | 2021–2026 |
| Year | Version | HP @ rpm | Torque @ rpm | Comp. |
|---|---|---|---|---|
| 2021 | G4KP net | 290 @ 5800 | 311 lb-ft @ 1650-4000 | 10.5:1 |
| 2022 | G4KP net | 290 @ 5800 | 311 lb-ft @ 1650-4000 | 10.5:1 |
| 2025 | G4KP net | 290 @ 5800 | 311 lb-ft @ 1650-4000 | 10.5:1 |
Factory specification sheet.
| Bore/stroke character | 0.872 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,996 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 38.1 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 | 290 hp | G4KP |
| 2022 | 290 hp | G4KP |
| 2023 | — | G4KP |
| 2024 | — | G4KP |
| 2025 | 290 hp | G4KP |
| 2026 | — | G4KP |
2 factory vehicles, 2021–2026. Each year opens that model's engine table.