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Nissan QR25DE specs: 2.5L (153 ci) 4-cylinder, 88.9 x 100.1 mm (3.5000 x 3.9400 in) bore and stroke. Rated 170 hp, 2008–2020. Used in the Nissan Altima.
The Nissan QR25DE is undersquare — the 3.94" stroke exceeds the 3.5" bore by 11.2% — a layout that trades peak RPM for leverage and torque low in the range. The 3.94" stroke puts mean piston speed at 4,000 ft/min around 6,100 RPM, which is where a production bottom end is generally considered at its limit. Each of the 4 cylinders displaces 38.3 ci (627 cc).
It is one of 3 engines in the Nissan 153ci family, all of them 153 ci — the differences between them are in compression, heads and rating, not displacement. 15 factory variants share these dimensions, rated at 170 hp across 2008–2020.
| Displacement | 153 ci / 2.5 L |
|---|---|
| Bore | 3.5" |
| Stroke | 3.94" |
| Cylinders | 4 |
| Configuration | I4 |
| Compression ratio | 9.6–10:1 (published figures vary) |
| Bore/stroke ratio | 0.888 |
| Fuel type | gas |
|---|---|
| Redline | 6,200 rpm (factory limit) |
| Advertised HP | 170 hp |
| Years | 2008–2020 |
| Year | Version | HP @ rpm | Torque @ rpm | Comp. |
|---|---|---|---|---|
| 2008 | QR25DE net | 170 @ 6000 | 175 lb-ft @ 4400 | 9.6:1 |
| 2010 | QR25DE net | 170 @ 6000 | 175 lb-ft @ 4400 | 9.6:1 |
| 2012 | QR25DE net | 170 @ 6000 | 175 lb-ft @ 4400 | 9.6:1 |
| 2013 | QR25DE net | 170 @ 6000 | 175 lb-ft @ 4400 | 9.6:1 |
| 2014 | QR25DE net | 170 @ 6000 | 175 lb-ft @ 4400 | 10:1 |
| 2015 | QR25DE net | 170 @ 6000 | 175 lb-ft @ 4400 | 10:1 |
| 2016 | QR25DE net | 170 @ 6000 | 175 lb-ft @ 4400 | 10:1 |
| 2017 | QR25DE net | 170 @ 6000 | 175 lb-ft @ 4400 | 10:1 |
| 2018 | QR25DE net | 170 @ 6000 | 175 lb-ft @ 4400 | 10:1 |
| 2019 | QR25DE net | 170 @ 6000 | 175 lb-ft @ 4400 | 10:1 |
| 2020 | QR25DE net | 170 @ 6000 | 175 lb-ft @ 4400 | 10:1 |
Factory specification sheet.
| Bore/stroke character | 0.888 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,940 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 38.3 ci |
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 |
|---|---|---|
| 2008 | 170 hp | QR25DE |
| 2009 | — | QR25DE |
| 2010 | 170 hp | QR25DE |
| 2011 | — | QR25DE |
| 2012 | 170 hp | QR25DE |
| 2013 | 170 hp | QR25DE |
| 2014 | — | QR25DE |
| 2014 | 170 hp | QR25DE |
| 2015 | — | QR25DE |
| 2015 | 170 hp | QR25DE |
| 2016 | 170 hp | QR25DE |
| 2017 | 170 hp | QR25DE |
| 2018 | 170 hp | QR25DE |
| 2019 | 170 hp | QR25DE |
| 2020 | 170 hp | QR25DE |
6 factory vehicles, 2002–2020. Each year opens that model's engine table.