See other engines in this family
The same engine also has a main page: Nissan VQ40DE.
Infiniti VQ40DE specs: 4.0L (243.9 ci) 6-cylinder, 95.5 x 92 mm (3.7598 x 3.6220 in) bore and stroke, 9.7:1 compression. Rated 261 hp. DOHC.
The Infiniti VQ40DE is close to square: 3.7598" bore against 3.622" stroke, within 3.8%, which splits the difference between a high-revving layout and a torque layout. The 3.622" stroke puts mean piston speed at 4,000 ft/min around 6,650 RPM, which is where a production bottom end is generally considered at its limit. Each of the 6 cylinders displaces 40.7 ci (666 cc).
9.7:1 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, the largest at 243.9 ci. Factory fitments include the Infiniti QX4 (Middle East).
| Displacement | 243.9 ci / 4 L |
|---|---|
| Bore | 3.7598" |
| Stroke | 3.622" |
| Cylinders | 6 |
| Compression ratio | 9.7:1 |
| Bore/stroke ratio | 1.038 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 261 hp |
| Bore/stroke character | 1.038 — square — bore and stroke are within 5%, a balanced compromise |
|---|---|
| Mean piston speed at 6,000 RPM | 3,622 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 40.6 ci |
| Static compression | 9.7:1 — in the range that usually runs on pump premium |
Each link opens the calculator with this engine's specs already filled in.