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Hyundai G6AT specs: 3.0L (181.4 ci) 6-cylinder, 91.1 x 76 mm (3.5870 x 2.9920 in) bore and stroke, 9:1 compression. Rated 145 hp. Rod ratio and piston speed.
The Hyundai G6AT is oversquare — the 3.587" bore exceeds the 2.992" stroke by 19.9% — a layout that favors airflow and RPM over leverage at the crank. The 2.992" stroke does not reach 4,000 ft/min of mean piston speed until about 8,000 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 6 cylinders displaces 30.2 ci (495 cc).
9:1 on aluminum heads is low by modern standards and generally happy on regular pump fuel.
It is one of 2 engines in the Sigma family, the smallest at 181.4 ci. Factory fitments include the Hyundai Grandeur, Hyundai Sonata, Hyundai XG300.
| Displacement | 181.4 ci / 3 L |
|---|---|
| Bore | 3.587" |
| Stroke | 2.992" |
| Cylinders | 6 |
| Compression ratio | 9:1 |
| Bore/stroke ratio | 1.199 |
| Block material | cast iron |
|---|---|
| Head material | aluminum |
| Valvetrain | SOHC |
| Fuel type | gas |
| Advertised HP | 145 hp |
| Bore/stroke character | 1.199 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 2,992 ft/min — conservative for a street engine |
| Displacement per cylinder | 30.2 ci |
| Static compression | 9:1 — low by modern standards, generally happy on regular pump fuel |
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