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Nissan MR20DE specs: 2.0L (122 ci) 4-cylinder, 84 x 90.1 mm (3.3071 x 3.5472 in) bore and stroke, 9.7:1 compression. Rated 140 hp, 2007–2012.
The Nissan MR20DE is undersquare — the 3.5472" stroke exceeds the 3.3071" bore by 6.8% — a layout that trades peak RPM for leverage and torque low in the range. The 3.5472" stroke puts mean piston speed at 4,000 ft/min around 6,750 RPM, which is where a production bottom end is generally considered at its limit. Each of the 4 cylinders displaces 30.5 ci (500 cc).
9.7:1 is in the range that usually runs on pump premium.
It is one of 6 engines in the Nissan 122ci family, all of them 122 ci — the differences between them are in compression, heads and rating, not displacement. 6 factory variants share these dimensions, rated at 140 hp across 2007–2012.
| Displacement | 122 ci / 2 L |
|---|---|
| Bore | 3.3071" |
| Stroke | 3.5472" |
| Cylinders | 4 |
| Configuration | I4 |
| Compression ratio | 9.7:1 |
| Bore/stroke ratio | 0.932 |
| Fuel type | gas |
|---|---|
| Redline | 6,400 rpm (factory limit) |
| Advertised HP | 140 hp |
| Years | 2007–2012 |
| Year | Version | HP @ rpm | Torque @ rpm | Comp. |
|---|---|---|---|---|
| 2007 | MR20DE net | 140 @ 5100 | 147 lb-ft @ 4800 | 9.7:1 |
| 2008 | MR20DE net | 140 @ 5100 | 147 lb-ft @ 4800 | 9.7:1 |
| 2009 | MR20DE net | 140 @ 5100 | 147 lb-ft @ 4800 | 9.7:1 |
| 2010 | MR20DE net | 140 @ 5100 | 147 lb-ft @ 4800 | 9.7:1 |
| 2011 | MR20DE net | 140 @ 5100 | 147 lb-ft @ 4800 | 9.7:1 |
| 2012 | MR20DE net | 140 @ 5100 | 147 lb-ft @ 4800 | 9.7:1 |
Factory specification sheet.
| Bore/stroke character | 0.932 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,547 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 30.5 ci |
| Static compression | 9.7:1 — 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 |
|---|---|---|
| 2007 | 140 hp | MR20DE |
| 2008 | 140 hp | MR20DE |
| 2009 | 140 hp | MR20DE |
| 2010 | 140 hp | MR20DE |
| 2011 | 140 hp | MR20DE |
| 2012 | 140 hp | MR20DE |
1 factory vehicle, 2007–2012. Each year opens that model's engine table.