BMW N53 Straight 6 Petrol Engine
From 2007 to 2014
The BMW N53 is a straight 6 DOHC piston engine which was produced from 2006 to 2011.
The most important innovations compared to the predecessor model BMW N52 are the gasoline direct injection and a reduced fuel consumption by lean operation with stratified charge in the partial load range. The lean operation requires an increased nitrogen oxide (NO x ), the use of a special NO x storage catalytic converter is therefore mandatory. The mode of action of a NO x storage catalytic converter requires low-sulfur fuel.
Because of the high levels of sulfur in the fuel sold in the US and Australia, BMW does not offer the engine in these countries.
The engine block is made of a magnesium alloy
It is the final naturally aspirated straight-6 engine produced by BMW, ending a history of continuous production of this engine configuration since 1968. The N53 released in 2006 in the facelifted E60/E61 523i and 525i. Following the introduction of the N20 turbocharged straight-4 engine in 2011, the N53 began to be phased out. The N54 turbocharged straight-6 engine was produced alongside the N53, therefore the N54 took over as the highest performance six-cylinder engine.
Compared with its N52 predecessor which was port-injected, the N53 uses direct injection (consisting of Piëzo-electric injectors directly in the cylinder) with a stratified lean mixture operation.The N53 has variable valve timing on both camshafts (called double vanos by BMW) and a magnesium alloy block. Unlike the N52, the N53 does not contain variable valve lift (called valvetronic by BMW), due to space limitations in the cylinder head.
BMW never sold the N53 engine in North American, Australian and Malaysian vehicles, due to the high sulphur content of the fuel available in these markets.These regions continued to use the N52 port-injected naturally-aspirated and N54 direct-injection twin-turbo inline-6 engines for the 2007-2011 model years.
Models
| Engine Code | Displacement | Power | Torque | Bore | Stroke | CR | Year |
|---|---|---|---|---|---|---|---|
| N53B25-U0 | 2,497 cc (152 cu in) | 140 kW (190 hp) @ 6100 rpm | 235 N·m (173 lb·ft) @ 3500-5000 rpm | 82.0 | 78.8 | 12.0 | 2007 |
| N53B30 | 2,996 cc (183 cu in) | 150 kW (200 hp) @ 6700 rpm | 270 N·m (200 lb·ft) @ 1500-4250 rpm | 85.0 | 88.0 | 12.0 | 2010 |
| N53B30-U0 | 160 kW (210 hp) @ 6100 rpm | 270 N·m (200 lb·ft) @ 2400-4200 rpm | 85.0 | 88.0 | 12.0 | 2007 | |
| N53B30 | 200 kW (270 hp) @ 6100 rpm | 310 N·m (230 lb·ft) @ 1600-4250 rpm | 85.0 | 88.0 | 12.0 | 2010 | |
| N53B30-O0 | 200 kW (270 hp) @ 6700 rpm | 320 N·m (240 lb·ft) @ 2750-3000 rpm | 85.0 | 88.0 | 12.0 | 2007 |
N53B25-U0
The 2.5-litre N53B25-U0 is used in the E60/E61 523i and produces 140 kW and 235 Nm.
BMW E60/E61 5-Series 523i Performance
| Engine Size | 2497cc |
|---|---|
| Cylinders | 6 |
| Valves | 24 |
| Fuel Type | Petrol |
| Power | 187 bhp |
|---|---|
| Top Speed | 147 mph |
| 0-60 mph | 7.9 secs |
| Torque | 240 Nm, 177 ft-lb |
| CO2 Emissions | 177 g/km |
| Euro Emissions Standard | 4 |
| Miles Per Tank | 569 miles |
Applications:
- 2006-2010 E60/E61 523i
N53B30-U0
The E90/E91/E92 325i switched from the 2.5 litre N52 to the 3.0 litre N53B30-U0 in March 2007. Despite the increased displacement, the maximum power remained unchanged at 160 kW.
Applications:
- 2007-2011 E90/E91/E92/E93 325i
- 2006-2010 E60/E61 525i
- 2009-2011 F10/F11 523i
- 2009-2011 F10/F11 528i
- since 2007 BMW E90 / E91 / E92 : 325i, 325xi
- since 2007 BMW E93 : 325i
- 2007-2010 BMW E60 / E61 : 525i, 525xi
- 190 kW
- 2010-2011 BMW F10 : 528i
N53B30-O0
BMW E60/E61 5-Series 530i specification
| Engine Size | 2996cc |
|---|---|
| Cylinders | 6 |
| Valves | 24 |
| Fuel Type | Petrol |
| Power | 268 bhp |
|---|---|
| Top Speed | 155 mph |
| 0-60 mph | 6.3 secs |
| Torque | 310 Nm, 229 ft-lb |
| CO2 Emissions | 177 g/km |
| Euro Emissions Standard | 5 |
| Miles Per Tank | 569 miles |
The N53B30-O0 increased power to 200 kW (270 hp) and torque to 320 N·m (240 lb·ft).
Applications:
- 2007-2011 E90/E91/E92/E93 330i
- 2007-2010 E60/E61 530i
- 2007-2010 BMW E63 : 630i
- 2007-2010 BMW E60 / E61 : 530i, 530xi
- since 2007 BMW E93 : 330i
- since 2007 BMW E90 / E91 / E92 : 330i, 330xi
- from 09/2011 to 07/2013 BMW F10 : 530i
