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Hyundai G6AU specs: 3.5L (213.6 ci) 6-cylinder, 93 x 85.8 mm (3.6614 x 3.3780 in) bore and stroke, 10:1 compression. Rated 195 hp. Rod ratio and piston speed.
The Hyundai G6AU is oversquare — the 3.6614" bore exceeds the 3.378" stroke by 8.4% — a layout that favors airflow and RPM over leverage at the crank. The 3.378" stroke does not reach 4,000 ft/min of mean piston speed until about 7,100 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 6 cylinders displaces 35.6 ci (583 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 2 engines in the Sigma family, the largest at 213.6 ci. Factory fitments include the Hyundai XG350, Hyundai Santa Fe, Hyundai Grandeur.
| Displacement | 213.6 ci / 3.5 L |
|---|---|
| Bore | 3.6614" |
| Stroke | 3.378" |
| Cylinders | 6 |
| Compression ratio | 10:1 |
| Bore/stroke ratio | 1.084 |
| Block material | cast iron |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 195 hp |
| Bore/stroke character | 1.084 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,378 ft/min — conservative for a street engine |
| Displacement per cylinder | 35.6 ci |
| Static compression | 10:1 — in the range that usually runs on pump premium |
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