BMW N53

BMW N53 engine
Overview
Manufacturer BMW
Production 2006–2014
Layout
Configuration Straight-6
Valvetrain DOHC
Chronology
Predecessor BMW N52
Successor None

The BMW N53 is a naturally aspirated straight-6 petrol engine which was produced from 2006 to 2014. The N53 replaced the N52 and was released in 2006 in the post-facelift E60/E61 523i and 525i.

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.[1] 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.

The N53 is the final naturally aspirated straight-6 engine produced by BMW, ending a history of continuous production of this engine configuration since the M30 in 1968. The N53 began to be phased out following the introduction of the N20 turbocharged straight-4 engine in 2011.

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

Design

Double-VANOS, as seen on an N52 engine

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.[2] Unlike the N52, the N53 does not contain variable valve lift (called valvetronic by BMW), due to space limitations in the cylinder head.[3][4] The compression ratio was increased to 12.0:1 for the N53.[5]

As per the N52, the N53 has variable valve timing on both camshafts (called double vanos by BMW) and a magnesium alloy block.[5] The bore and stroke are also the same as the N52, at 85.0 mm (3.3 in) and 88.0 mm (3.5 in) respectively. Each cylinder has an individual coil to create a spark for the plug (coil on plug), as per the N52.[6]

Models

Engine CodeDisplacementPowerTorqueYears
N53B252,497 cc (152 cu in)140 kW (190 hp)
@ 6100 rpm		235 N⋅m (173 lb⋅ft)
@ 3500-5000 rpm		2006-2010
N53B302,996 cc (183 cu in)150 kW (200 hp)
@ 6100 rpm		270 N⋅m (200 lb⋅ft)
@ 1500-4250 rpm		2009-2011
160 kW (210 hp)
@ 6100 rpm		270 N⋅m (200 lb⋅ft)
@ 2400-4200 rpm		2007-2011
190 kW (250 hp)
@ 6600 rpm		310 N⋅m (230 lb⋅ft)
@ 2600-5000 rpm		2009-2011
200 kW (270 hp)
@ 6700 rpm		320 N⋅m (240 lb⋅ft)
@ 2750-3000 rpm		2007-2013

N53B25

The 2.5-litre version of the N53 produces 140 kW and 235 Nm.[4] It has a bore of 82.0 mm (3.2 in) and a stroke of 78.8 mm (3.1 in).

Applications:[7]

N53B30 (150 kW)

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

Applications:[8]

N53B30 (160 kW)

This 3.0 litre version of the N53 produces 160 kW,[4] the same figure as the 2.5 litre version of the N52 that it replaced. However, peak torque increased from 250 Nm to 270 Nm.[9]

Applications:

N53B30 (190 kW)

A 190 kW version of the N53 was used in the pre-facelift F10 528i.[10]

Applications:

N53B30 (200 kW)

The most powerful version of the N53 produces 200 kW (270 hp) of power and 320 N⋅m (240 lb⋅ft) of torque.[4][11]

Applications:

High-Pressure Fuel Pump failures

The N53 uses the same High-Pressure Fuel Pump (HPFP) as the N54 turbocharged straight-six engine,[12] 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.[13]

Failure of the N53 HPFP have been reported,[14] although it is not known whether failure in the N53 is as common as the N54.

See also

References

  1. ↑ "BMW's N52 versus N53 - what are we missing?". paultan.org.
  2. ↑ http://metric.or.kr/Common/download/download_file.asp?dpath=thesis&fname=car-j-1906-0082.pdf
  3. ↑ "BMW Straight 6 Engine - N Series". BMWInformation.com. Archived from the original on 21 April 2008.
  4. 1 2 3 4 "Engine specifications for N53 engines". www.bmwheaven.com.
  5. 1 2 "BMW N53B25 Engine". www.mywikimotors.com. Retrieved 24 November 2017.
  6. ↑ "6' E63 LCI 630i Ignition coil/spark plug". www.realoem.com. Retrieved 30 November 2017.
  7. ↑ "BMW Engine Codes". racingdynamics.com.
  8. ↑ "2009 BMW 523i F10 Specifications". www.carfolio.com. Retrieved 30 November 2017.
  9. ↑ "BMW E60 5 Series 525i Specs". www.ultimatespecs.com. Retrieved 30 November 2017.
  10. ↑ "2010 BMW 528i (model since mid-year 2010 for Europe ) specs review". www.automobile-catalog.com. Retrieved 30 November 2017.
  11. ↑ "2007 BMW 630i Coupé specifications". www.carfolio.com. Retrieved 30 November 2017.
  12. ↑ "13517616170 Exch high-pressure pump". www.realoem.com. Retrieved 28 November 2017.
  13. ↑ "What's the deal with all these Lemon/Buyback 335i's?". www.bimmerfest.com.
  14. ↑ "BMW N53B25 Engine". www.mywikimotors.com. Retrieved 28 November 2017.
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