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Kia G3.5 DPi specs: 3.5L (213.58 ci) 6-cylinder, 92 x 87 mm (3.6220 x 3.4252 in) bore and stroke, 11.5:1 compression. Rated 290 hp. DOHC.
The Kia G3.5 DPi 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 35.6 ci (583 cc).
11.5:1 on aluminum heads is high for a production gasoline engine; running a ratio like that on pump fuel depends on chamber design and fuel delivery rather than the number alone.
It is one of 13 engines in the Smartstream family, the largest at 213.58 ci. Factory fitments include the Kia Carnival, Kia Sorento (Middle East).
| Displacement | 213.58 ci / 3.5 L |
|---|---|
| Bore | 3.622" |
| Stroke | 3.4252" |
| Cylinders | 6 |
| Compression ratio | 11.5:1 |
| Bore/stroke ratio | 1.057 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 290 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 | 35.6 ci |
| Static compression | 11.5:1 — high enough that pump premium or better is normally required |
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