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The same engine also has a main page: Nissan VQ25HR.
Infiniti VQ25HR specs: 2.5L (152 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 VQ25HR 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 25.3 ci (415 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.
| Displacement | 152 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 | 25.3 ci |
| Static compression | 10.3:1 — in the range that usually runs on pump premium |
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