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BMW N53

FieldValue
nameBMW N53 engine
image530i_Touring_Msport_LCI_59.JPG
production2006–2013
configurationStraight-6
blockMagnesium-Aluminium
headAluminium
valvetrainDOHC, with VVT
fueltypePetrol
displacement2497 cc
2996 cc
bore82 mm
85 mm
stroke78.8 mm
88 mm
predecessorBMW N52
successorBMW N54

2996 cc 85 mm 88 mm

The BMW N53 is a naturally aspirated straight-6 petrol engine which was produced from 2006 to 2013. The N53 replaced the BMW N52 in certain markets and debuted on the post-facelift E60 5 Series.

In European markets, the N53 began replacing its port-injected parent, the BMW N52, in 2007. Markets such as the United States, Canada, Australia, and Malaysia retained the N52, as the N53 was deemed unsuitable due to the high sulfur content of local fuel.

The N52 and N53 are the last naturally aspirated straight-six engines produced by BMW, ending a history of continuous production of this engine configuration since the BMW M30 in 1968. In 2011, the N52 began to be replaced by the BMW N20 turbocharged four-cylinder engine. N53 production ceased in 2013.

There is no BMW M version of the N53. The BMW N54 turbocharged straight-6 engine was produced alongside the N53.

TOC

Design

Compared with its N52 predecessor which was port-injected, the N53 uses direct injection. The direct injection system uses piezoelectric fuel injectors which inject into the combustion chamber, using a stratified lean mixture operation. The compression ratio was increased to 12.0:1 for the N53.

As per the N52, the N53 has double-VANOS (variable valve timing) and a magnesium alloy block. Unlike the N52, the N53 does not have Valvetronic (variable valve lift), due to space limitations in the cylinder head.

The bore of 85 mm and stroke of 88 mm are the same as the N52. Each cylinder has coil-on-plug ignition, as per the N52.

Versions

Engine CodeDisplacementPowerTorqueYears
N53B252497 cc140 kW
at 6,100 rpm235 Nm
at 3,500-5,000 rpm2006-2010
N53B302996 cc150 kW
at 6,100 rpm270 Nm
at 1,500-4,250 rpm2009-2011
160 kW
at 6,100 rpm270 Nm
at 2,400-4,200 rpm2007-2013
190 kW
at 6,600 rpm310 Nm
at 2,600-5,000 rpm2009-2011
200 kW
at 6,700 rpm320 Nm
at 2,750-3,000 rpm2007-2013

N53B25

The 2.5 L version of the N53 produces 140 kW and 235 Nm. It has a bore of 82 mm and a stroke of 78.8 mm.

Applications:

  • 2006-2010 E60/E61 523i

N53B30 (150 kW)

A 150 kW version of the N53 was used in the pre-facelift F10 523i.

Applications:

  • 2009-2011 F10/F11 523i

N53B30 (160 kW)

This 3.0 L version of the N53 produces 160 kW, the same figure as the 2.5 L version of its N52 predecessor. However, peak torque increased from 250 to.

Applications:

  • 2007-2013 E90/E91/E92/E93 325i
  • 2006-2010 E60/E61 525i

N53B30 (190 kW)

A 190 kW version of the N53 was used in the pre-facelift F10 528i.

Applications:

  • 2009-2011 F10/F11 528i

N53B30 (200 kW)

The most powerful version of the N53 produces 200 kW of power and 320 Nm of torque.

Applications:

  • 2007-2010 E60/E61 530i
  • 2007-2010 E63 630i
  • 2007-2013 E90/E91/E92/E93 330i
  • 2011-2013 F10 530i

High-Pressure Fuel Pump failures

The N53 uses the same High-Pressure Fuel Pump (HPFP) as the BMW N54 turbocharged straight-six engine, which had HPFP failures leading to Lemon Law "buy backs" and legal action in the United States. The N53 engine was not sold in the United States, therefore the N53 engine was not involved with these actions.

Failures of the N53 HPFP have been reported, although it is not known whether failure in the N53 is as common as the N54.

References

References

  1. "BMW's N52 versus N53 - what are we missing?".
  2. "Metric.or.kr".
  3. (8 March 2015). "BMW N53B25 Engine".
  4. "BMW Straight 6 Engine - N Series".
  5. "Engine specifications for N53 engines".
  6. "6' E63 LCI 630i Ignition coil/spark plug".
  7. "BMW Engine Codes".
  8. "2009 BMW 523i F10 Specifications".
  9. "BMW E60 5 Series 525i Specs".
  10. (July 2025). "2010 BMW 528i (model since mid-year 2010 for Europe ) specs review".
  11. "2007 BMW 630i Coupé specifications".
  12. "13517616170 Exch high-pressure pump".
  13. "What's the deal with all these Lemon/Buyback 335i's?".
  14. (8 March 2015). "BMW N53B25 Engine".
Info: Wikipedia Source

This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page.

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