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Volkswagen CJAA specs: 2.0L (120.1 ci) 4-cylinder, 81 x 95.5 mm (3.1890 x 3.7598 in) bore and stroke, 16.5:1 compression. Rated 140 hp, 2009–2014.
The Volkswagen CJAA is undersquare — the 3.7598" stroke exceeds the 3.189" bore by 15.2% — a layout that trades peak RPM for leverage and torque low in the range. The 3.7598" stroke puts mean piston speed at 4,000 ft/min around 6,400 RPM, which is where a production bottom end is generally considered at its limit. Each of the 4 cylinders displaces 30.0 ci (492 cc).
At 16.5:1 this is a compression-ignition engine: the ratio is the heat source that lights the fuel, not a knock limit to be managed.
It is one of 5 engines in the EA189 TDI family, all of them 120.1 ci — the differences between them are in compression, heads and rating, not displacement. 6 factory variants share these dimensions, rated at 140 hp across 2009–2014.
| Displacement | 120.1 ci / 2 L |
|---|---|
| Bore | 3.189" |
| Stroke | 3.7598" |
| Cylinders | 4 |
| Configuration | I4 |
| Compression ratio | 16.5:1 |
| Bore/stroke ratio | 0.848 |
| Fuel type | diesel |
|---|---|
| Advertised HP | 140 hp |
| Years | 2009–2014 |
| Year | Version | HP @ rpm | Torque @ rpm | Comp. |
|---|---|---|---|---|
| 2010 | CJAA net | 140 @ 4000 | 236 lb-ft @ 1750 | 16.5:1 |
| 2011 | CJAA net | 140 @ 4000 | 236 lb-ft @ 1750 | 16.5:1 |
| 2012 | CJAA net | 140 @ 4000 | 236 lb-ft @ 1750 | 16.5:1 |
| 2013 | CJAA net | 140 @ 4000 | 236 lb-ft @ 1750 | 16.5:1 |
| 2014 | CJAA net | 140 @ 4000 | 236 lb-ft @ 1750 | 16.5:1 |
Factory specification sheet.
| Bore/stroke character | 0.848 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,760 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 30.0 ci |
| Static compression | 16.5:1 — high enough that pump premium or better is normally required |
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 |
|---|---|---|
| 2009 | 140 hp | CJAA |
| 2010 | 140 hp | CJAA |
| 2011 | 140 hp | CJAA |
| 2012 | 140 hp | CJAA |
| 2013 | 140 hp | CJAA |
| 2014 | 140 hp | CJAA |
2 factory vehicles, 2009–2015. Each year opens that model's engine table.