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Nissan VQ23DE specs: 2.3L (143.3 ci) 6-cylinder, 85 x 69 mm (3.3460 x 2.7170 in) bore and stroke, 9.8:1 compression. Rated 170 hp. Rod ratio and piston speed.
The Nissan VQ23DE is oversquare — the 3.346" bore exceeds the 2.717" stroke by 23.2% — a layout that favors airflow and RPM over leverage at the crank. The 2.717" stroke does not reach 4,000 ft/min of mean piston speed until about 8,850 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 6 cylinders displaces 23.9 ci (391 cc).
9.8:1 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, sitting between the 121.9 ci and 243.8 ci members. Factory fitments include the Nissan Teana J31, Nissan Teana J32, Nissan Presage U31 and 1 other.
| Displacement | 143.3 ci / 2.3 L |
|---|---|
| Bore | 3.346" |
| Stroke | 2.717" |
| Cylinders | 6 |
| Compression ratio | 9.8:1 |
| Bore/stroke ratio | 1.232 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 170 hp |
| Bore/stroke character | 1.232 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 2,717 ft/min — conservative for a street engine |
| Displacement per cylinder | 23.9 ci |
| Static compression | 9.8:1 — in the range that usually runs on pump premium |
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