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Hyundai G4LC specs: 1.4L (83.5 ci) 4-cylinder, 72 x 84 mm (2.8346 x 3.3071 in) bore and stroke, 10.5:1 compression. Rated 100 hp. Rod ratio and piston speed.
The Hyundai G4LC is undersquare — the 3.3071" stroke exceeds the 2.8346" bore by 14.3% — a layout that trades peak RPM for leverage and torque low in the range. The 3.3071" stroke does not reach 4,000 ft/min of mean piston speed until about 7,250 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 4 cylinders displaces 20.9 ci (342 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, the largest at 83.5 ci. Factory fitments include the Hyundai i20, Hyundai i30, Kia Ceed.
| Displacement | 83.5 ci / 1.4 L |
|---|---|
| Bore | 2.8346" |
| Stroke | 3.3071" |
| Cylinders | 4 |
| Compression ratio | 10.5:1 |
| Bore/stroke ratio | 0.857 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 100 hp |
| Bore/stroke character | 0.857 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,307 ft/min — conservative for a street engine |
| Displacement per cylinder | 20.9 ci |
| Static compression | 10.5:1 — in the range that usually runs on pump premium |
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