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Hyundai G4LA specs: 1.2L (76.2 ci) 4-cylinder, 71 x 78.8 mm (2.7953 x 3.1024 in) bore and stroke, 10.5:1 compression. Rated 84 hp. Rod ratio and piston speed.
The Hyundai G4LA is undersquare — the 3.1024" stroke exceeds the 2.7953" bore by 9.9% — a layout that trades peak RPM for leverage and torque low in the range. The 3.1024" stroke does not reach 4,000 ft/min of mean piston speed until about 7,750 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 4 cylinders displaces 19.1 ci (312 cc).
10.5:1 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 4 engines in the Kappa family, sitting between the 61 ci and 83.5 ci members. Factory fitments include the Hyundai i10, Hyundai i20, Kia Rio.
| Displacement | 76.2 ci / 1.2 L |
|---|---|
| Bore | 2.7953" |
| Stroke | 3.1024" |
| Cylinders | 4 |
| Compression ratio | 10.5:1 |
| Bore/stroke ratio | 0.901 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 84 hp |
| Bore/stroke character | 0.901 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,102 ft/min — conservative for a street engine |
| Displacement per cylinder | 19.1 ci |
| Static compression | 10.5:1 — in the range that usually runs on pump premium |
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