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Hyundai G6DS specs: 3.5L (212.2 ci) 6-cylinder, 92 x 87 mm (3.6220 x 3.4252 in) bore and stroke, 11:1 compression. Rated 375 hp. Rod ratio and piston speed.
The Hyundai G6DS is oversquare — the 3.622" bore exceeds the 3.4252" stroke by 5.7% — a layout that favors airflow and RPM over leverage at the crank. 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 6 cylinders displaces 35.4 ci (580 cc).
11:1 on aluminum heads is high enough that pump premium or better is normally required.
It is one of 5 engines in the Smartstream family, the largest at 212.2 ci. Factory fitments include the Genesis GV80, Genesis G80, Genesis GV70.
| Displacement | 212.2 ci / 3.5 L |
|---|---|
| Bore | 3.622" |
| Stroke | 3.4252" |
| Cylinders | 6 |
| Compression ratio | 11:1 |
| Bore/stroke ratio | 1.057 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 375 hp |
| Bore/stroke character | 1.057 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,425 ft/min — conservative for a street engine |
| Displacement per cylinder | 35.4 ci |
| Static compression | 11:1 — high enough that pump premium or better is normally required |
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