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Hyundai G4NA specs: 2.0L (122 ci) 4-cylinder, 81 x 97 mm (3.1890 x 3.8189 in) bore and stroke, 10.3:1 compression. Rated 147 hp. Rod ratio and piston speed.
The Hyundai G4NA 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).
10.3:1 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 2 engines in the Nu family, the largest at 122 ci. Factory fitments include the Elantra, Tucson, Kona.
| Displacement | 122 ci / 2 L |
|---|---|
| Bore | 3.189" |
| Stroke | 3.8189" |
| Cylinders | 4 |
| Compression ratio | 10.3:1 |
| Bore/stroke ratio | 0.835 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 147 hp |
| 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 | 10.3:1 — in the range that usually runs on pump premium |
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