Page organisation in this revision
- Page type
- Technical article
- Subject
- Engines
- Parent
- Section level
- Applies to
- No ECU-specific applicability
- Tool groups
- None
- Manufacturers
- None
Changes from revision 3 to revision 3
Removed text is struck through; added text is highlighted.
BMW automotive engine families listed as N45. Specifications below retain the source's separate family and variant labels.
Family specifications
BMW N45 engine
FieldReported valueProduction2004-2011ConfigurationInline-4Displacement1.6 L (1,596 cc) 2.0 L (1,997 cc)Cylinder bore84 mm (3.31 in) 85 mm (3.35 in)Piston stroke72 mm (2.83 in) 88 mm (3.46 in)Cylinder block materialAluminiumCylinder head materialAluminiumValvetrainDOHC , with VVTFuel typePetrolPredecessorBMW N40SuccessorBMW N43
Variant specifications
Models
EngineDisplacementPowerTorqueYearsN45B161,596 cc (97.4 cu in)85 kW (114 bhp) at 6,000 rpm150 N⋅m (111 lb⋅ft) at 4,300 rpm2004-2011N45B20S1,997 cc (121.9 cu in)127 kW (170 bhp) at 7,000 rpm200 N⋅m (148 lb⋅ft) at 4,250 rpm2006
Recorded vehicle applications
N45B16
2004–2011 E81/E87 116i2006–2009 E90/E91 316i
N45B20S
2006 E90 320si (Limited production model)
BMW automotive engine directory
Design, development and variant notes
The naturally aspirated N45 is related to the N46 but omits Valvetronic and balance shafts; it retains double-VANOS cam timing. The 2007 revision is called N45N.
N45B20S was enlarged to 1,997 cc for 320si racing homologation. N45 production continued alongside the direct-injection N43 in markets where high-sulphur fuel limited use of the latter.
Data adapted from the cited Wikipedia revision by Wikipedia contributors under CC BY-SA 4.0. Production dates and fitments reflect that revision; verify the exact engine code, market and vehicle before applying a specification.
Sources
Curated reference notes. Applicability follows the cited sources; hardware testing by this wiki is not implied.
Wikipedia: List of BMW engines. Wikipedia contributors; CC BY-SA 4.0. Source revision oldid 1382309748; accessed 2026-11-10.Wikipedia: BMW N45. Wikipedia contributors; CC BY-SA 4.0. Source revision oldid 1307205247; accessed 2026-11-10.
Further Wikipedia-sourced details
The following additional information is drawn from the cited Wikipedia revision by Wikipedia contributors, available under CC BY-SA 4.0. An open-ended date reflects the source snapshot, not confirmed current production or fitment.
Additional technical and variant notes
The 1,997 cc N45B20S was developed for 320si competition homologation. The source identifies a carbon-fibre valve cover as a visible difference from other N45 versions.
Rendered revisions
Open each version to inspect formatting, tables and photographs.
Revision 3: BMW N45 engines
BMW automotive engine families listed as N45. Specifications below retain the source's separate family and variant labels.
Family specifications
BMW N45 engine
| Field | Reported value |
|---|
| Production | 2004-2011 |
| Configuration | Inline-4 |
| Displacement | 1.6 L (1,596 cc) 2.0 L (1,997 cc) |
| Cylinder bore | 84 mm (3.31 in) 85 mm (3.35 in) |
| Piston stroke | 72 mm (2.83 in) 88 mm (3.46 in) |
| Cylinder block material | Aluminium |
| Cylinder head material | Aluminium |
| Valvetrain | DOHC , with VVT |
| Fuel type | Petrol |
| Predecessor | BMW N40 |
| Successor | BMW N43 |
Variant specifications
Models
| Engine | Displacement | Power | Torque | Years |
|---|
| N45B16 | 1,596 cc (97.4 cu in) | 85 kW (114 bhp) at 6,000 rpm | 150 N⋅m (111 lb⋅ft) at 4,300 rpm | 2004-2011 |
| N45B20S | 1,997 cc (121.9 cu in) | 127 kW (170 bhp) at 7,000 rpm | 200 N⋅m (148 lb⋅ft) at 4,250 rpm | 2006 |
Recorded vehicle applications
N45B16
- 2004–2011 E81/E87 116i
- 2006–2009 E90/E91 316i
N45B20S
- 2006 E90 320si (Limited production model)
BMW automotive engine directory
Design, development and variant notes
The naturally aspirated N45 is related to the N46 but omits Valvetronic and balance shafts; it retains double-VANOS cam timing. The 2007 revision is called N45N.
N45B20S was enlarged to 1,997 cc for 320si racing homologation. N45 production continued alongside the direct-injection N43 in markets where high-sulphur fuel limited use of the latter.
Data adapted from the cited Wikipedia revision by Wikipedia contributors under CC BY-SA 4.0. Production dates and fitments reflect that revision; verify the exact engine code, market and vehicle before applying a specification.
Sources
Curated reference notes. Applicability follows the cited sources; hardware testing by this wiki is not implied.
Further Wikipedia-sourced details
The following additional information is drawn from the cited Wikipedia revision by Wikipedia contributors, available under CC BY-SA 4.0. An open-ended date reflects the source snapshot, not confirmed current production or fitment.
Additional technical and variant notes
The 1,997 cc N45B20S was developed for 320si competition homologation. The source identifies a carbon-fibre valve cover as a visible difference from other N45 versions.
Revision 3: BMW N45 engines
BMW automotive engine families listed as N45. Specifications below retain the source's separate family and variant labels.
Family specifications
BMW N45 engine
| Field | Reported value |
|---|
| Production | 2004-2011 |
| Configuration | Inline-4 |
| Displacement | 1.6 L (1,596 cc) 2.0 L (1,997 cc) |
| Cylinder bore | 84 mm (3.31 in) 85 mm (3.35 in) |
| Piston stroke | 72 mm (2.83 in) 88 mm (3.46 in) |
| Cylinder block material | Aluminium |
| Cylinder head material | Aluminium |
| Valvetrain | DOHC , with VVT |
| Fuel type | Petrol |
| Predecessor | BMW N40 |
| Successor | BMW N43 |
Variant specifications
Models
| Engine | Displacement | Power | Torque | Years |
|---|
| N45B16 | 1,596 cc (97.4 cu in) | 85 kW (114 bhp) at 6,000 rpm | 150 N⋅m (111 lb⋅ft) at 4,300 rpm | 2004-2011 |
| N45B20S | 1,997 cc (121.9 cu in) | 127 kW (170 bhp) at 7,000 rpm | 200 N⋅m (148 lb⋅ft) at 4,250 rpm | 2006 |
Recorded vehicle applications
N45B16
- 2004–2011 E81/E87 116i
- 2006–2009 E90/E91 316i
N45B20S
- 2006 E90 320si (Limited production model)
BMW automotive engine directory
Design, development and variant notes
The naturally aspirated N45 is related to the N46 but omits Valvetronic and balance shafts; it retains double-VANOS cam timing. The 2007 revision is called N45N.
N45B20S was enlarged to 1,997 cc for 320si racing homologation. N45 production continued alongside the direct-injection N43 in markets where high-sulphur fuel limited use of the latter.
Data adapted from the cited Wikipedia revision by Wikipedia contributors under CC BY-SA 4.0. Production dates and fitments reflect that revision; verify the exact engine code, market and vehicle before applying a specification.
Sources
Curated reference notes. Applicability follows the cited sources; hardware testing by this wiki is not implied.
Further Wikipedia-sourced details
The following additional information is drawn from the cited Wikipedia revision by Wikipedia contributors, available under CC BY-SA 4.0. An open-ended date reflects the source snapshot, not confirmed current production or fitment.
Additional technical and variant notes
The 1,997 cc N45B20S was developed for 320si competition homologation. The source identifies a carbon-fibre valve cover as a visible difference from other N45 versions.