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Hyundai G4KK specs: 2.4L (144 ci) 4-cylinder, 88 x 97 mm (3.4646 x 3.8189 in) bore and stroke, 13:1 compression. Rated 199-206 hp, 2011–2015.
The Hyundai G4KK is undersquare — the 3.8189" stroke exceeds the 3.4646" bore by 9.3% — 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 36.0 ci (590 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 10 engines in the Theta II family, sitting between the 121.9 ci and 146.5 ci members. 5 factory variants share these dimensions, rated from 199 to 206 hp across 2011–2015.
| Displacement | 144 ci / 2.4 L |
|---|---|
| Bore | 3.4646" |
| Stroke | 3.8189" |
| Cylinders | 4 |
| Configuration | I4 |
| Compression ratio | 13:1 * |
| Bore/stroke ratio | 0.907 |
* Compression ratio from a single source; not yet cross-verified.
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 199–206 hp |
| Years | 2011–2015 |
| Bore/stroke character | 0.907 — 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 | 36.0 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 |
|---|---|---|
| 2011 | 198–206 hp | G4KK |
| 2012 | 206 hp | G4KK |
| 2013 | 198–199 hp | G4KK |
| 2014 | 192–199 hp | G4KK |
| 2015 | — | G4KK |
2 factory vehicles, 2011–2016. Each year opens that model's engine table.