See other engines in this family
Hyundai G4NS specs: 2.0L (122 ci) 4-cylinder, 81 x 97 mm (3.1890 x 3.8189 in) bore and stroke, 12.5:1 compression. Rated 192 hp, 2020–2026.
The Hyundai G4NS is undersquare — the 3.8189" stroke exceeds the 3.189" bore by 16.5% — a layout that trades peak RPM for leverage and torque low in the range. The 3.8189" stroke puts mean piston speed at 4,000 ft/min around 6,300 RPM, which is where a production bottom end is generally considered at its limit. Each of the 4 cylinders displaces 30.5 ci (500 cc).
12.5:1 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 Nu family, the largest at 122 ci. 7 factory variants share these dimensions, rated at 192 hp across 2020–2026.
| Displacement | 122 ci / 2 L |
|---|---|
| Bore | 3.189" |
| Stroke | 3.8189" |
| Cylinders | 4 |
| Configuration | I4 |
| Compression ratio | 12.5:1 * |
| Bore/stroke ratio | 0.835 |
* Compression ratio from a single source; not yet cross-verified.
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 192 hp |
| Years | 2020–2026 |
| Bore/stroke character | 0.835 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,819 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 30.5 ci |
| Static compression | 12.5:1 — 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 |
|---|---|---|
| 2020 | — | G4NS |
| 2021 | 192 hp | G4NS |
| 2022 | 192 hp | G4NS |
| 2023 | — | G4NS |
| 2024 | 192 hp | G4NS |
| 2025 | — | G4NS |
| 2026 | 192 hp | G4NS |
1 factory vehicle, 2020–2026. Each year opens that model's engine table.