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Nissan 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 Nissan 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 14 engines in the VQ family, the smallest at 121.9 ci. Factory fitments include the Nissan Cefiro A32, Nissan Cefiro A33, Nissan Maxima QX (Europe).
| 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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