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Hyundai G4KC specs: 2.4L (146.5 ci) 4-cylinder, 88 x 97 mm (3.4646 x 3.8189 in) bore and stroke, 11.3:1 compression. Rated 190 hp. Rod ratio and piston speed.
The Hyundai G4KC 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 36.6 ci (600 cc).
11.3:1 on aluminum heads is high enough that pump premium or better is normally required.
It is one of 5 engines in the Theta II family, the largest at 146.5 ci. Factory fitments include the Hyundai Sonata, Hyundai Santa Fe, Kia Sorento and 1 other.
| Displacement | 146.5 ci / 2.4 L |
|---|---|
| Bore | 3.4646" |
| Stroke | 3.8189" |
| Cylinders | 4 |
| Compression ratio | 11.3:1 |
| Bore/stroke ratio | 0.907 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 190 hp |
| 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 | 36.6 ci |
| Static compression | 11.3:1 — high enough that pump premium or better is normally required |
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