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BMW N52B30 specs: 3.0L (183 ci) 6-cylinder, 85 x 88 mm (3.3465 x 3.4646 in) bore and stroke, 10.7:1 compression. Rated 215-260 hp, 2006–2013.
The BMW N52B30 is close to square: 3.3465" bore against 3.4646" stroke, within 3.4%, which splits the difference between a high-revving layout and a torque layout. 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 6 cylinders displaces 30.5 ci (500 cc).
10.7:1 is in the range that usually runs on pump premium.
It is one of 8 engines in the BMW 183ci family, all of them 183 ci — the differences between them are in compression, heads and rating, not displacement. 21 factory variants share these dimensions, rated from 215 to 260 hp across 2006–2013.
| Displacement | 183 ci / 3 L |
|---|---|
| Bore | 3.3465" |
| Stroke | 3.4646" |
| Cylinders | 6 |
| Configuration | I6 |
| Compression ratio | 10.7:1 |
| Bore/stroke ratio | 0.966 |
| Fuel type | gas |
|---|---|
| Firing order | 1-5-3-6-2-4 |
| Advertised HP | 215–260 hp |
| Years | 2006–2013 |
| Year | Version | HP @ rpm | Torque @ rpm | Comp. |
|---|---|---|---|---|
| 2006 | N52B30 net | 215 @ 6250 | 185 lb-ft @ 2750 | 10.7:1 |
| 2006 | N52B30 net | 255 @ 6600 | 220 lb-ft @ 2750 | 10.7:1 |
| 2007 | N52B30 net | 215 @ 6250 | 185 lb-ft @ 2750 | 10.7:1 |
| 2007 | N52B30 net | 255 @ 6600 | 220 lb-ft @ 2750 | 10.7:1 |
| 2007 | N52B30 net | 260 @ 6600 | 225 lb-ft @ 2750 | 10.7:1 |
| 2008 | N52B30 net | 215 @ 6250 | 185 lb-ft @ 2750 | 10.7:1 |
| 2008 | N52B30 net | 255 @ 6600 | 220 lb-ft @ 2750 | 10.7:1 |
| 2008 | N52B30 net | 260 @ 6600 | 225 lb-ft @ 2750 | 10.7:1 |
| 2009 | N52B30 net | 255 @ 6600 | 220 lb-ft @ 2750 | 10.7:1 |
| 2009 | N52B30 net | 260 @ 6600 | 225 lb-ft @ 2750 | 10.7:1 |
| 2010 | N52B30 net | 255 @ 6600 | 220 lb-ft @ 2750 | 10.7:1 |
| 2010 | N52B30 net | 260 @ 6600 | 225 lb-ft @ 2750 | 10.7:1 |
| 2011 | N52B30 net | 240 @ 6600 | 230 lb-ft @ 2600 | — |
| 2011 | N52B30 net | 255 @ 6600 | 220 lb-ft @ 2750 | 10.7:1 |
Factory specification sheet.
| Bore/stroke character | 0.966 — square — bore and stroke are within 5%, a balanced compromise |
|---|---|
| Mean piston speed at 6,000 RPM | 3,465 ft/min — conservative for a street engine |
| Displacement per cylinder | 30.5 ci |
| Static compression | 10.7:1 — 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 |
|---|---|---|
| 2006 | 215 hp | N52B30 |
| 2006 | 255 hp | N52B30 |
| 2007 | 215 hp | N52B30 |
| 2007 | 230 hp | N52B30 |
| 2007 | 255 hp | N52B30 |
| 2007 | 260 hp | N52B30 |
| 2008 | 215 hp | N52B30 |
| 2008 | 230 hp | N52B30 |
| 2008 | 255 hp | N52B30 |
| 2008 | 260 hp | N52B30 |
| 2009 | 230 hp | N52B30 |
| 2009 | 255 hp | N52B30 |
| 2009 | 260 hp | N52B30 |
| 2010 | 230 hp | N52B30 |
| 2010 | 255 hp | N52B30 |
| 2010 | 260 hp | N52B30 |
| 2011 | 230 hp | N52B30 |
| 2011 | 240 hp | N52B30 |
| 2011 | 255 hp | N52B30 |
| 2012 | 230 hp | N52B30 |
| 2013 | 230 hp | N52B30 |
5 factory vehicles, 2006–2013. Each year opens that model's engine table.