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Hyundai G4ED specs: 1.6L (97.6 ci) 4-cylinder, 76 x 87 mm (2.9921 x 3.4252 in) bore and stroke, 10:1 compression. Rated 105 hp. Rod ratio and piston speed.
The Hyundai G4ED is undersquare — the 3.4252" stroke exceeds the 2.9921" bore by 12.6% — a layout that trades peak RPM for leverage and torque low in the range. The 3.4252" stroke puts mean piston speed at 4,000 ft/min around 7,000 RPM, which is where a production bottom end is generally considered at its limit. Each of the 4 cylinders displaces 24.4 ci (400 cc).
10:1 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 3 engines in the Alpha family, the largest at 97.6 ci. Factory fitments include the Hyundai Elantra, Hyundai Accent, Hyundai Getz.
| Displacement | 97.6 ci / 1.6 L |
|---|---|
| Bore | 2.9921" |
| Stroke | 3.4252" |
| Cylinders | 4 |
| Compression ratio | 10:1 |
| Bore/stroke ratio | 0.874 |
| Block material | cast iron |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 105 hp |
| Bore/stroke character | 0.874 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,425 ft/min — conservative for a street engine |
| Displacement per cylinder | 24.4 ci |
| Static compression | 10:1 — in the range that usually runs on pump premium |
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