See other engines in this family
The same engine also has a main page: Nissan VQ25HR.
Infiniti Vq25de specs: 2.5L (152.6 ci) 6-cylinder, 85 x 73.3 mm (3.3465 x 2.8858 in) bore and stroke, 10.3:1 compression. Rated 218 hp. DOHC.
The Infiniti Vq25de is oversquare — the 3.3465" bore exceeds the 2.8858" stroke by 16.0% — 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 25.4 ci (417 cc).
10.3:1 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 13 engines in the VQ family, sitting between the 121.9 ci and 243.9 ci members. Factory fitments include the Infiniti G25, Infiniti EX25, Infiniti G25 (Japan) and 1 other.
| Displacement | 152.6 ci / 2.5 L |
|---|---|
| Bore | 3.3465" |
| Stroke | 2.8858" |
| Cylinders | 6 |
| Compression ratio | 10.3:1 |
| Bore/stroke ratio | 1.16 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 218 hp |
| Bore/stroke character | 1.160 — 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 | 25.4 ci |
| Static compression | 10.3:1 — in the range that usually runs on pump premium |
Each link opens the calculator with this engine's specs already filled in.