BMW N55 explained

BMW N55
Production:2009–2019
Configuration:Straight-6
Displacement:2979cc
Bore:841NaN1
Head:Aluminium
Stroke:89.61NaN1
Block:Aluminium
Valvetrain:DOHC, with VVT & VVL
Timing:Chain
Compression:10.2:1
Redline:7,000 RPM
Turbocharger:Single BorgWarner twin-scroll with Intercooler
Management:Bosch MEVD 17.2
Fueltype:Petrol
Predecessor:BMW N54
Successor:BMW B58

The BMW N55 is a turbocharged straight-six petrol (gasoline) engine that began production in 2009. The N55 replaced the BMW N54 engine and was introduced in the F07 5 Series Gran Turismo.

The N55 was BMW's first straight-six engine to use a twin-scroll turbocharger. It also won three straight Ward's 10 Best Engines awards in 2011–2013.[1]

Following the introduction of the BMW B58 engine in 2015, the N55 began to be phased out.[2]

The BMW S55 engine is a high performance version of the N55 made by BMW M GmbH, which is used by the F80 M3, F82 M4 and F87 M2 Competition/CS.

Design

The main differences between the N55 and its N54 predecessor are the use of a single turbocharger, the addition of Valvetronic and the type of fuel injectors. Whilst the N54 used a twin-turbo arrangement, the newer N55 uses only a single twin scroll turbocharger.[3] [4] Valvetronic (variable valve lift) is claimed to improve throttle response, low-rev torque, exhaust emissions and to reduce fuel consumption by 15%.[5] [6] [7] The direct injection system uses solenoid-type injectors, instead of the piezo-type fuel injectors used by its N54 predecessor. The piezo injectors were more expensive and BMW decided they were not worthwhile outside of Europe, because the potential benefits of lean-burn operation could not be fully realised.[6]

The exhaust manifold design, called Cylinder-bank Comprehensive Manifold (CCM) by BMW, aims to reduce the pressure fluctuations to reduce throttle lag and exhaust back-pressure.[8] The twin-scroll turbocharger uses 2 sets of exhaust duct to turn 1 turbine wheel, with cylinders 1–3 and 4–6.[9] The engine management system is Bosch MEVD 17.2, and compatible fuels are ROZ (RON) 91–98 octane (minimum RON 95 is recommended),[10] [11]

As per the N54, the compression ratio is 10.2:1, the bore is 84mm, the stroke is 89.6mm and the displacement is 29791NaN1.

Versions

Version PowerTorqueRedlineYears
N55B30M0 2250NaN0
at 5,700–5,800 rpm 		4000NaN0
at 1,200–5,000 rpm 		7,000 rpm 2009–2019
N55B30 2350NaN0
at 4,505–6,000 rpm 		4500NaN0
at 1,300–4,500 rpm 		2011–present
N55B30O0 2400NaN0
at 4,505–6,000 rpm 		2014–2016
N55HP 2500NaN0
at 4,505–6,000 rpm 		2013–2015
N55B30T0 2650NaN0
at 5,255–6,000 rpm 		4650NaN0
at 1,350–5,250 rpm 		2015–present
2720NaN0
at 6,500 rpm 		5000NaN0
at 1,450–4750 rpm
Alpina 3010NaN0
at 5,500–6,250 rpm 		6000NaN0 at
3,000–4,000 rpm 		2013–2017
3240NaN0
at 5,500–6250 rpm 		6600NaN0 at
3,000–4,000 rpm 		2017–present
3320NaN0
at 5,500–6,250 rpm 		6800NaN0 at
3,000–4,500 rpm 		2018–present

N55B30M0

Applications:

N55B30

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N55B30O0

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N55HP

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N55B30T0

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Alpina

Biturbo engine by Alpina based on the N55B30M0. The crankcase is of a different design and specially cast by BMW for Alpina.[16]

301 kW version

The N55R20A is Alpina's initial version of the N55, producing 3010NaN0. The twin turbocharger system of the N54B30 is used, replacing the twin-scroll charging system originally applied.

Applications:

324 kW version

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332 kW version

Application:

S55 engine

BMW S55 engine
Configuration:Straight-6
Displacement:2979cc
Bore:84mm
Stroke:89.6mm
Block:Aluminium
Valvetrain:DOHC, with VVT & VVL
Redline:7,600 RPM
Turbocharger:Twin-turbo
Fueltype:Petrol
Predecessor:BMW S54
Successor:BMW S58

The S55 engine is the high performance version engine developed from the N55 engine by BMW M. It was introduced in the F80 M3, F82 M4 and later to the F87 M2 Competition/CS, replacing the BMW S65 naturally aspirated V8 engine used in the previous generation M3.

Differences compared with the N55 include a closed-deck engine block, lightweight crankshaft, different crankshaft bearings, strengthened pistons/rods, different springs/valve material, twin turbos, twin fuel pumps, active exhaust, revised cooling system and intercoolers.[18] [19]

2050NaN0 – 2680NaN0 version

Applications:

3020NaN0, 550Nm version

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3170NaN0 version

Applications:

3310NaN0 version

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3380NaN0 version

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3680NaN0 version

This version produces 3680NaN0 and 6000NaN0,[26] due to the use of a water injection system. Three water injectors are used to lower the temperature of the air in the intake manifold, allowing the boost pressure to be increased from 17.2psi to 21.6psi.[27] [28]

Applications:

See also

Notes and References

  1. Web site: Ward's 10 Best Engines Winners, 1995–2012. wardsintelligence.informa.com. 5 January 2012. 21 December 2021. https://web.archive.org/web/20120311095404/http://wardsauto.com/datasheet/wards-10-best-engines-winners-1995-2012. 11 March 2012. dead.
  2. Web site: BMW University Technical Training- B58 Engine. Bimmerfile.com.
  3. Web site: Ryan ZumMallen . Pop The Hood: Inside the Innovative N55 Engine in the BMW 335i . Automedia.com . 2012-08-13 . 2012-08-04 . https://web.archive.org/web/20120804203223/http://www.automedia.com/Blog/Post/Pop-The-Hood-Inside-the-Innovative-N55-Engine-in-the-BMW-335i.aspx . dead .
  4. Web site: BMW unveils single turbo N55 six-cylinder engine for new 5-series GT . Motorauthority.com.
  5. Web site: BMW N54 and N55 Six Cylinder Turbocharged Engines. Unixnerd.demon.co.uk. 20 December 2017. 20 February 2020. https://web.archive.org/web/20200220005506/http://www.unixnerd.demon.co.uk/n54.html. dead.
  6. Web site: BMW's Newest I-6 Better, Not Bigger . Wardsauto.com.
  7. Web site: 2011 BMW 335i Sedan . Caranddriver.com.
  8. Web site: The NEW ///M Motor in Depth . Bimmerfile.com.
  9. Web site: Turbocharging Technology (F30) . Kneb.net . dead . https://web.archive.org/web/20150615011535/http://www.kneb.net/bmw/F30/08_Turbocharging%20Technology.pdf . 2015-06-15 .
  10. Web site: F30 powertrain . bmwuniversity.com . dead . https://web.archive.org/web/20140603225157/http://prodcds.bmwuniversity.com/library/bmw/Technician/Technical%20Training%202011/ST1113%20F30%20Complete%20Vehicle/02_F30%20Powertrain.pdf . 2014-06-03 .
  11. Web site: Engine Electronics IPO's (F01-02) . Kneb.net . dead . https://web.archive.org/web/20140603225215/http://www.kneb.net/bmw/F01-02/02_Engine%20Electronics%20IPOs.pdf . 2014-06-03 .
  12. Web site: Six-Cylinder 2012 BMW 640i Coupe Priced from $74,475, Convertible from $81,975 . Blog.caranddriver.com . 2011-09-24 . 2011-09-25 . https://web.archive.org/web/20110925004150/http://blog.caranddriver.com/six-cylinder-2012-bmw-640i-coupe-priced-from-74475-convertible-from-81975/ . dead .
  13. Web site: BMW 135is Coupe – Model Overview. Bmwusa.com.
  14. Web site: 2012 BMW M135i . Autoblog.com.
  15. Web site: BMW's M135i is much better than it looks . Ausmotive.com.
  16. News: The Alpina philosophy – motoring.com.au. Gratton. Ken. 2016-12-23. motoring.com.au. en-US. 2016-12-24.
  17. Web site: Road Vehicle Descriptor (RVD1). rvcs-prodweb.dot.gov.au. 2016-11-24.
  18. Web site: F80 M3 / F82 M4 Complete Technical Docs (With S55 Engine Guide). Bimmerpost.com.
  19. Web site: Meet The New S55 Engine. Bmwblog.com.
  20. News: BMW M2 CS Racing makes its North American debut. autodevot.com. 2020-02-02. en.
  21. News: BMW M2 Competition specs leaked. MotorMag.com.au. 2018-04-10. en.
  22. Web site: 2013 BMW M3 F80 specifications. Carfolio.com. 21 July 2017.
  23. Web site: BMW M3 Sedan – BMW Australia. Bmw.com.au. 30 May 2018.
  24. Web site: BMW M4 Coupé – BMW Australia. Bmw.com.au. 30 May 2018. 2 May 2018. https://web.archive.org/web/20180502213719/https://www.bmw.com.au/bmw-cars/m-series/2017-m4-coupe. dead.
  25. Web site: 444-Horsepower M2 CS Can Be Had With 3 Pedals. 2019-11-06. BimmerLife. en-US. 2019-12-31.
  26. Web site: 2015 BMW M4 GTS specifications. Carfolio.com. 30 December 2017.
  27. Web site: First Drive Review – 2016 BMW M4 GTS. Caranddriver.com. 30 December 2017.
  28. Web site: The 2016 BMW M4 GTS is a street-legal water-injected track monster, and it's coming to the US. Autoweek.com. 30 December 2017.
  29. Web site: BMW M4 DTM Champion Edition marking Marco Wittmann's 2016 DTM championship title. . BMW PressClub Global . 31 October 2019.

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