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Kia G6BA specs: 2.7L (164.8 ci) 6-cylinder, 86.7 x 75 mm (3.4134 x 2.9528 in) bore and stroke, 10:1 compression. Rated 170 hp, 2006.
The Kia G6BA is oversquare — the 3.4134" bore exceeds the 2.9528" stroke by 15.6% — a layout that favors airflow and RPM over leverage at the crank. The 2.9528" stroke does not reach 4,000 ft/min of mean piston speed until about 8,150 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 6 cylinders displaces 27.5 ci (450 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 Kia 165ci family, all of them 164.8 ci — the differences between them are in compression, heads and rating, not displacement.
| Displacement | 164.8 ci / 2.7 L |
|---|---|
| Bore | 3.4134" |
| Stroke | 2.9528" |
| Cylinders | 6 |
| Configuration | V6 |
| Compression ratio | 10:1 |
| Bore/stroke ratio | 1.156 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 170 hp |
| Years | 2006 |
| Bore/stroke character | 1.156 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 2,953 ft/min — conservative for a street engine |
| Displacement per cylinder | 27.5 ci |
| Static compression | 10:1 — in the range that usually runs on pump premium |
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1 factory vehicle, 2006. Each year opens that model's engine table.