BMW N55

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BMW N55 engine
BMW N55 engine 2013.jpg
Overview
Manufacturer BMW
Production 2009–present
Layout
Configuration Straight-6
Valvetrain DOHC
Combustion
Turbocharger Single twin-scroll
Fuel system Direct injection
Chronology
Predecessor BMW N54
Successor BMW B58

The BMW N55 is a turbocharged straight-6 petrol engine that began production in 2009. The N55 replaced the N54 and was introduced in the F07 535i Gran Turismo.[1]

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.[2]

Following the introduction of the B58 engine in 2015, the N55 began to be phased out.[3]

The F80 M3, F82 M4 and F87 M2 Competition are powered by the S55 engine, which is the high performance version of the N55.

Design[edit]

The main differences between the N55 and its N54 predecessor are the use of a single turbocharger, the addition of variable valve lift and the type of fuel injectors. The N54 uses twin-turbochargers (operating in a parallel configuration), however the N55 uses a single twin scroll turbocharger.[4][5] Variable valve lift (called Valvetronic by BMW)[6] is used on the N55 engine, improving throttle response, low-rev torque, exhaust emissions and increasing fuel economy by 15%.[7][6][8] Instead of using piezo-type fuel injectors for the direct injection system, the N55 uses Bosch solenoid-type injectors. 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.[9] The twin-scroll turbocharger uses 2 sets of exhaust duct to turn 1 turbine wheel, with cylinders 1-3 and 4-6.[10] The engine management system is Bosch MEVD 17.2, and compatible fuels are ROZ (RON) 91-98 octane (minimum RON 95 is recommended),[11][12]

As per the N54, the compression ratio is 10.2:1, the bore is 84 mm (3.3 in), the stroke is 89.6 mm (3.5 in) and the capacity is 2,979 cc (181.8 cu in).

Transmission pairings[edit]

A six-speed manual transmission (ZF S6-45) was available with the N55 in some models.

For the automatic transmissions, initially the N55 was used with a ZF 6HP19 six-speed automatic.[13] In 2009, the six-speed automatic began to be replaced by the ZF 8HP45 eight-speed automatic transmission.[14][15]

In several models (including the 2011 BMW E82 135i and 2013 E82 135is), a Getrag 7-speed Dual-clutch transmission was available.[16][17]

Models[edit]

Engine Power Torque Redline Years
N55B30M0 225 kW (302 hp)
@ 4005-6000 rpm
400 N⋅m (295 lb⋅ft)
@ 1200-4000 rpm
7000 rpm 2009-present
N55B30 235 kW (315 hp)
@ 4505-6000 rpm
450 N⋅m (332 lb⋅ft)
@ 1300-4500 rpm
7000 rpm 2011-present
N55B30O0 240 kW (322 hp)
@ 4505-6000 rpm
450 N⋅m (332 lb⋅ft)
@ 1300-4500 rpm
7000 rpm 2014-2016
N55HP 250 kW (335 hp)
@ 4505-6000 rpm
450 N⋅m (332 lb⋅ft)
@ 1300-4500 rpm
7000 rpm 2013-2015
N55B30T0 265 kW (355 hp)
@ 5255-6000 rpm
465 N⋅m (343 lb⋅ft)
@ 1350-5250 rpm
7000 rpm 2015-present
N55B30T0 272 kW (365 hp)
@ 6500 rpm
500 N⋅m (369 lb⋅ft)
@ 1450-4750 rpm
7000 rpm 2015-present
Alpina (301 kW) 301 kW (404 hp)
@ 5500-6250 rpm
600 N⋅m (440 lb⋅ft) @
3000-4000 rpm
7000 rpm 2013-2017
Alpina (324 kW) 324 kW (434 hp)
@ 5500-6250 rpm
660 N⋅m (490 lb⋅ft) @
3000-4000 rpm
7000 rpm 2017-present
S55B30T0 317 kW (425 hp)
@ 5505-7300 rpm
550 N⋅m (410 lb⋅ft)
@ 1850-5500 rpm
7500 rpm 2016-present

N55B30M0 (225 kW)[edit]

Applications:

N55B30 (235 kW)[edit]

Applications:

N55B30O0 (240 kW)[edit]

Applications:

N55HP (250 kW)[edit]

Applications:

  • 2013–2015 F30 ActiveHybrid 3

N55B30T0 (265 kW)[edit]

Applications:

  • 2015–2018 F26 X4 M40i

N55B30T0 (272 kW)[edit]

Applications:

  • 2016–2018 F87 M2

Alpina[edit]

Biturbo engine by Alpina based on the N55B30M0. The crankcase is of a different design and specially cast by BMW for Alpina.[22]

301 kW version

The N55R30A is Alpina's initial version of the N55, producing 301 kW (404 hp).

Applications:

  • 2013–2017 Alpina F30/F31 B3 Bi-Turbo[23]
  • 2013–2017 Alpina F32 B4 Bi-Turbo
  • 2014–2017 Alpina F33 B4 Bi-Turbo

324 kW version

Applications:

  • 2017–present Alpina F30/F31 B3 S Bi-Turbo
  • 2017–present Alpina F32/F33 B4 S Bi-Turbo

S55[edit]

BMW S55 engine
2014 Washington Auto Show (12140974934).jpg
Overview
Manufacturer BMW
Production 2014–present
Layout
Configuration Straight-6
Valvetrain DOHC
Combustion
Turbocharger Twin-turbo
Fuel system Direct injection
Chronology
Predecessor BMW S65
Successor BMW S58 (2019)

The S55 engine is the high performance version of the N55 engine, which replaced the BMW S65 naturally aspirated V8 engine. Differences compared with the N55 include a closed-deck engine block, lightweight crankshaft, strengthened pistons, different valve material, twin turbos, twin fuel pumps, active exhaust and revised intercoolers.[24][25]

302 kW (405 hp) version[edit]

Applications:

  • 2018-present F87 M2 Competition[26]

317 kW (425 hp) version[edit]

Applications:

331 kW (444 hp) version[edit]

Applications:

338 kW (453 hp) version[edit]

Applications:

368 kW (493 hp) version[edit]

This version produces 368 kW (493 hp) and 600 N⋅m (443 lb⋅ft),[30] 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 17.2 psi (1.19 bar) to 21.6 psi (1.49 bar).[31][32]

Applications:

See also[edit]

References[edit]

  1. ^ "The New BMW 5-Series Gran Turismo". Paultan.org. 
  2. ^ "Ward's 10 Best Engines Winners, 1995-2012". Wardsauto.com. Retrieved 21 December 2017. 
  3. ^ "BMW University Technical Training- B58 Engine" (PDF). Bimmerfile.com. 
  4. ^ Ryan ZumMallen. "Pop The Hood: Inside the Innovative N55 Engine in the BMW 335i". Automedia.com. 
  5. ^ "BMW unveils single turbo N55 six-cylinder engine for new 5-series GT". Motorauthority.com. 
  6. ^ a b c "BMW's Newest I-6 Better, Not Bigger". Wardsauto.com. 
  7. ^ "BMW N54 and N55 Six Cylinder Turbocharged Engines". Unixnerd.demon.co.uk. Retrieved 20 December 2017. 
  8. ^ "2011 BMW 335i Sedan". Caranddriver.com. 
  9. ^ "The NEW ///M Motor in Depth". Bimmerfile.com. 
  10. ^ "Turbocharging Technology (F30)" (PDF). Kneb.net. Archived from the original (PDF) on 2015-06-15. 
  11. ^ "F30 powertrain" (PDF). bmwuniversity.com. Archived from the original (PDF) on 2014-06-03. 
  12. ^ "Engine Electronics IPO's (F01-02)" (PDF). Kneb.net. Archived from the original (PDF) on 2014-06-03. 
  13. ^ "3' E90 LCI 335i Automatic gearbox GA6HP19Z". Realoem.com. Retrieved 21 December 2017. 
  14. ^ "Six-Cylinder Midsize Luxury Sedan Comparison - Audi A6, BMW 535i, Lexus GS 350, Infiniti M37". Motortrend.com. 
  15. ^ "5' F10 535i Automatic transmission GA8HP45Z". Realoem.com. Retrieved 21 December 2017. 
  16. ^ "World Premiere: 2013 BMW 135is Coupe and Convertible". Bmwblog.com. 
  17. ^ "2011 BMW 135i DCT - BMW Luxury Coupe Review". Automobilemag.com. 
  18. ^ "Six-Cylinder 2012 BMW 640i Coupe Priced from $74,475, Convertible from $81,975". Blog.caranddriver.com. 
  19. ^ "BMW 135is Coupe - Model Overview". Bmwusa.com. 
  20. ^ "2012 BMW M135i". Autoblog.com. 
  21. ^ "BMW's M135i is much better than it looks". Ausmotive.com. 
  22. ^ Gratton, Ken (2016-12-23). "The Alpina philosophy - motoring.com.au". motoring.com.au. Retrieved 2016-12-24. 
  23. ^ "Road Vehicle Descriptor (RVD1)". rvcs-prodweb.dot.gov.au. Retrieved 2016-11-24. 
  24. ^ "F80 M3 / F82 M4 Complete Technical Docs (With S55 Engine Guide)". Bimmerpost.com. 
  25. ^ "Meet The New S55 Engine". Bmwblog.com. 
  26. ^ "BMW M2 Competition specs leaked". MotorMag.com.au. Retrieved 2018-04-10. 
  27. ^ a b "2013 BMW M3 F80 specifications". Carfolio.com. Retrieved 21 July 2017. 
  28. ^ "BMW M3 Sedan - BMW Australia". Bmw.com.au. Retrieved 30 May 2018. 
  29. ^ "BMW M4 Coupé - BMW Australia". Bmw.com.au. Retrieved 30 May 2018. 
  30. ^ "2015 BMW M4 GTS specifications". Carfolio.com. Retrieved 30 December 2017. 
  31. ^ "First Drive Review - 2016 BMW M4 GTS". Caranddriver.com. Retrieved 30 December 2017. 
  32. ^ "The 2016 BMW M4 GTS is a street-legal water-injected track monster, and it's coming to the US". Autoweek.com. Retrieved 30 December 2017.