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Hyundai G4KJ specs: 2.4L (144 ci) 4-cylinder, 88 x 97 mm (3.4646 x 3.8189 in) bore and stroke, 11.3:1 compression. Rated 185-190 hp, 2011–2019.
The Hyundai G4KJ 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).
11.3:1 on aluminum heads is high enough that pump premium or better is normally required.
It is one of 10 engines in the Theta II family, sitting between the 121.9 ci and 146.5 ci members. 9 factory variants share these dimensions, rated from 185 to 190 hp across 2011–2019.
| Displacement | 144 ci / 2.4 L |
|---|---|
| Bore | 3.4646" |
| Stroke | 3.8189" |
| Cylinders | 4 |
| Configuration | I4 |
| Compression ratio | 11.3:1 |
| Bore/stroke ratio | 0.907 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 185–190 hp |
| Years | 2011–2019 |
| Year | Version | HP @ rpm | Torque @ rpm | Comp. |
|---|---|---|---|---|
| 2014 | G4KJ net | 190 * | 179 lb-ft * | 11.3:1 * |
| 2015 | G4KJ net | 185 @ 6000 | 178 lb-ft @ 4000 | 11.3:1 |
| 2016 | G4KJ net | 185 @ 6000 | 178 lb-ft @ 4000 | 11.3:1 |
| 2017 | G4KJ net | 185 @ 6000 | 178 lb-ft @ 4000 | 11.3:1 |
| 2018 | G4KJ net | 185 @ 6000 | 178 lb-ft @ 4000 | 11.3:1 |
| 2019 | G4KJ net | 185 @ 6000 | 178 lb-ft @ 4000 | 11.3:1 |
Factory specification sheet. * Not yet cross-verified.
| 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 | 11.3:1 — 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 | — | G4KJ |
| 2012 | — | G4KJ |
| 2013 | — | G4KJ |
| 2014 | 190 hp | G4KJ |
| 2015 | 185 hp | G4KJ |
| 2016 | 185 hp | G4KJ |
| 2017 | 185 hp | G4KJ |
| 2018 | 185 hp | G4KJ |
| 2019 | 185 hp | G4KJ |
2 factory vehicles, 2011–2020. Each year opens that model's engine table.