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Nissan VQ30DE specs: 3.0L (182 ci) 6-cylinder, 93 x 73.3 mm (3.6614 x 2.8858 in) bore and stroke, 10:1 compression. Rated 190-222 hp. DOHC.
The Nissan VQ30DE is oversquare — the 3.6614" bore exceeds the 2.8858" stroke by 26.9% — a layout that favors airflow and RPM over leverage at the crank. The 2.8858" stroke does not reach 4,000 ft/min of mean piston speed until about 8,300 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 6 cylinders displaces 30.3 ci (497 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 14 engines in the VQ family, sitting between the 121.9 ci and 243.8 ci members. 2 factory variants share these dimensions, rated from 190 to 222 hp. Factory fitments include the Nissan Maxima A32, Infiniti I30 A32, Nissan Cefiro A32 and 3 others.
| Displacement | 182 ci / 3 L |
|---|---|
| Bore | 3.6614" |
| Stroke | 2.8858" |
| Cylinders | 6 |
| Compression ratio | 10:1 |
| Bore/stroke ratio | 1.269 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 190–222 hp |
| Bore/stroke character | 1.269 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 2,886 ft/min — conservative for a street engine |
| Displacement per cylinder | 30.3 ci |
| Static compression | 10:1 — in the range that usually runs on pump premium |
Each link opens the calculator with this engine's specs already filled in.
These records share identical bore, stroke, displacement and compression. They differ by model year and factory power rating.
| Year | Advertised HP | Code |
|---|---|---|
| — | 190 hp | VQ30DE |
| — | 222 hp | VQ30DE |