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The same engine also has a main page: Nissan VQ20DE.
Infiniti VQ20DE specs: 2.0L (121.9 ci) 6-cylinder, 76 x 73.3 mm (2.9921 x 2.8858 in) bore and stroke, 10:1 compression. Rated 150 hp. DOHC.
The Infiniti VQ20DE is close to square: 2.9921" bore against 2.8858" stroke, within 3.7%, which splits the difference between a high-revving layout and a torque layout. 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 20.3 ci (333 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 13 engines in the VQ family, the smallest at 121.9 ci. Factory fitments include the Infiniti I30 (Europe), Infiniti I30 (Japan).
| Displacement | 121.9 ci / 2 L |
|---|---|
| Bore | 2.9921" |
| Stroke | 2.8858" |
| Cylinders | 6 |
| Compression ratio | 10:1 |
| Bore/stroke ratio | 1.037 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 150 hp |
| Bore/stroke character | 1.037 — square — bore and stroke are within 5%, a balanced compromise |
|---|---|
| Mean piston speed at 6,000 RPM | 2,886 ft/min — conservative for a street engine |
| Displacement per cylinder | 20.3 ci |
| Static compression | 10:1 — in the range that usually runs on pump premium |
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