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Hyundai G8AA specs: 4.5L (274.5 ci) 8-cylinder, 86 x 96.8 mm (3.3858 x 3.8110 in) bore and stroke, 10.7:1 compression. Rated 266 hp. DOHC.
The Hyundai G8AA is undersquare — the 3.811" stroke exceeds the 3.3858" bore by 11.2% — a layout that trades peak RPM for leverage and torque low in the range. The 3.811" 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 8 cylinders displaces 34.3 ci (562 cc).
10.7:1 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.
Factory fitments include the Equus, Centennial.
| Displacement | 274.5 ci / 4.5 L |
|---|---|
| Bore | 3.3858" |
| Stroke | 3.811" |
| Cylinders | 8 |
| Compression ratio | 10.7:1 |
| Bore/stroke ratio | 0.888 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 266 hp |
| Bore/stroke character | 0.888 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,811 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 34.3 ci |
| Static compression | 10.7:1 — in the range that usually runs on pump premium |
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