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Kia G4FP specs: 1.6L (97.56 ci) 4-cylinder, 75.6 x 89 mm (2.9764 x 3.5039 in) bore and stroke, 10.5:1 compression. Rated 180 hp, 2021–2024.
The Kia G4FP is undersquare — the 3.5039" stroke exceeds the 2.9764" bore by 15.1% — a layout that trades peak RPM for leverage and torque low in the range. The 3.5039" stroke puts mean piston speed at 4,000 ft/min around 6,850 RPM, which is where a production bottom end is generally considered at its limit. Each of the 4 cylinders displaces 24.4 ci (400 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 16 engines in the Smartstream family, sitting between the 61.02 ci and 213.58 ci members. 4 factory variants share these dimensions, rated at 180 hp across 2021–2024.
| Displacement | 97.56 ci / 1.6 L |
|---|---|
| Bore | 2.9764" |
| Stroke | 3.5039" |
| Cylinders | 4 |
| Configuration | I4 |
| Compression ratio | 10.5:1 |
| Bore/stroke ratio | 0.849 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 180 hp |
| Years | 2021–2024 |
| Year | Version | HP @ rpm | Torque @ rpm | Comp. |
|---|---|---|---|---|
| 2021 | G4FP net | 180 @ 5500 | 195 lb-ft @ 1500-4500 | 10.5:1 |
| 2022 | G4FP net | 180 @ 5500 | 195 lb-ft @ 1500-4500 | 10.5:1 |
| 2024 | G4FP net | 180 @ 5500 | 195 lb-ft @ 1500-4500 | 10.5:1 |
Factory specification sheet.
| Bore/stroke character | 0.849 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,504 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 24.4 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 | 180 hp | G4FP |
| 2022 | 180 hp | G4FP |
| 2023 | — | G4FP |
| 2024 | 180 hp | G4FP |
2 factory vehicles, 2020–2024. Each year opens that model's engine table.