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Mazda MZR 2.0 specs: 1.999L (122 ci) 4-cylinder, 87.5 x 83.1 mm (3.4449 x 3.2717 in) bore and stroke, 10:1 compression. Rated 148 hp, 2004–2013.
The Mazda MZR 2.0 is oversquare — the 3.4449" bore exceeds the 3.2717" stroke by 5.3% — a layout that favors airflow and RPM over leverage at the crank. The 3.2717" stroke does not reach 4,000 ft/min of mean piston speed until about 7,350 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 4 cylinders displaces 30.5 ci (500 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 MZR family, the smallest at 122 ci. 10 factory variants share these dimensions, rated at 148 hp across 2004–2013.
| Displacement | 122 ci / 1.999 L |
|---|---|
| Bore | 3.4449" |
| Stroke | 3.2717" |
| Cylinders | 4 |
| Configuration | I4 |
| Compression ratio | 10:1 |
| Bore/stroke ratio | 1.053 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Redline | 6,500 rpm (factory limit) |
| Advertised HP | 148 hp |
| Years | 2004–2013 |
| Year | Version | HP @ rpm | Torque @ rpm | Comp. |
|---|---|---|---|---|
| 2004 | MZR 2.0 net | 148 @ 6500 | 135 lb-ft @ 4500 | 10:1 |
| 2005 | MZR 2.0 net | 148 @ 6500 | 135 lb-ft @ 4500 | 10:1 |
| 2007 | MZR 2.0 net | 148 @ 6500 | 135 lb-ft @ 4500 | 10:1 |
| 2008 | MZR 2.0 net | 148 @ 6500 | 135 lb-ft @ 4500 | 10:1 |
| 2009 | MZR 2.0 net | 148 @ 6500 | 135 lb-ft @ 4500 | 10:1 |
| 2010 | MZR 2.0 net | 148 @ 6500 | 135 lb-ft @ 4500 | 10:1 |
| 2011 | MZR 2.0 net | 148 @ 6500 | 135 lb-ft @ 4500 | 10:1 |
| 2012 | MZR 2.0 net | 148 @ 6500 | 135 lb-ft @ 4500 | 10:1 |
| 2013 | MZR 2.0 net | 148 @ 6500 | 135 lb-ft @ 4500 | 10:1 |
Factory specification sheet.
| Bore/stroke character | 1.053 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,272 ft/min — conservative for a street engine |
| Displacement per cylinder | 30.5 ci |
| Static compression | 10:1 — 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 |
|---|---|---|
| 2004 | 148 hp | MZR 2.0 |
| 2005 | 148 hp | MZR 2.0 |
| 2006 | 148–150 hp | MZR 2.0 |
| 2007 | 148 hp | MZR 2.0 |
| 2008 | 148 hp | MZR 2.0 |
| 2009 | 148 hp | MZR 2.0 |
| 2010 | 148 hp | MZR 2.0 |
| 2011 | 148 hp | MZR 2.0 |
| 2012 | 148 hp | MZR 2.0 |
| 2013 | 148 hp | MZR 2.0 |
1 factory vehicle, 2004–2013. Each year opens that model's engine table.