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Nissan QG18DE specs: 1.8L (108 ci) 4-cylinder, 80 x 88 mm (3.1496 x 3.4646 in) bore and stroke, 9.5:1 compression. Rated 126 hp, 2000–2006.
The Nissan QG18DE is undersquare — the 3.4646" stroke exceeds the 3.1496" bore by 9.1% — a layout that trades peak RPM for leverage and torque low in the range. The 3.4646" stroke puts mean piston speed at 4,000 ft/min around 6,950 RPM, which is where a production bottom end is generally considered at its limit. Each of the 4 cylinders displaces 27.0 ci (442 cc).
9.5:1 is in the range that usually runs on pump premium.
It is one of 2 engines in the Nissan 108ci family, all of them 108 ci — the differences between them are in compression, heads and rating, not displacement. 7 factory variants share these dimensions, rated at 126 hp across 2000–2006.
| Displacement | 108 ci / 1.8 L |
|---|---|
| Bore | 3.1496" |
| Stroke | 3.4646" |
| Cylinders | 4 |
| Configuration | I4 |
| Compression ratio | 9.5:1 * |
| Bore/stroke ratio | 0.909 |
* Compression ratio from a single source; not yet cross-verified.
| Fuel type | gas |
|---|---|
| Advertised HP | 126 hp |
| Years | 2000–2006 |
| Year | Version | HP @ rpm | Torque @ rpm | Comp. |
|---|---|---|---|---|
| 2000 | QG18DE net | 126 @ 6000 | 129 lb-ft @ 2400 | — |
| 2001 | QG18DE net | 126 @ 6000 | 129 lb-ft @ 2400 | — |
| 2002 | QG18DE net | 126 @ 6000 | 129 lb-ft @ 2400 | — |
| 2003 | QG18DE net | 126 @ 6000 | 129 lb-ft @ 2400 | — |
| 2004 | QG18DE net | 126 @ 6000 | 129 lb-ft @ 2400 | — |
| 2005 | QG18DE net | 126 @ 6000 | 129 lb-ft @ 2400 | — |
| 2006 | QG18DE net | 126 @ 6000 | 129 lb-ft @ 2400 | — |
Factory specification sheet.
| Bore/stroke character | 0.909 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,465 ft/min — conservative for a street engine |
| Displacement per cylinder | 27.0 ci |
| Static compression | 9.5:1 — in the range that usually runs on pump premium |
Each link opens the calculator with this engine's specs already filled in.
These records share identical bore, stroke, displacement and compression. They differ by model year and factory power rating.
| Year | Advertised HP | Code |
|---|---|---|
| 2000 | 126 hp | QG18DE |
| 2001 | 126 hp | QG18DE |
| 2002 | 126 hp | QG18DE |
| 2003 | 126 hp | QG18DE |
| 2004 | 126 hp | QG18DE |
| 2005 | 126 hp | QG18DE |
| 2006 | 126 hp | QG18DE |
1 factory vehicle, 2000–2006. Each year opens that model's engine table.