BMW N55

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BMW N55 engine
File:BMW N55 engine 2013.jpg
Overview
Manufacturer BMW
Production 2009–present
Combustion chamber
Configuration Straight-6
Chronology
Predecessor BMW N54
Successor BMW B58

The BMW N55 is a turbocharged direct injection straight-6 DOHC engine which began production in 2009. It was launched in the F07 535i Gran Turismo.[1] The N55 began to be phased out following the introduction of the B58 engine in 2015.[2]

Compared with its N54 predecessor, the N55 features a single twin-scroll turbo (the N54 uses twin turbos) and variable valve lift (called Valvetronic by BMW).

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

Models

Engine Power Torque Redline Year
N55B30M0 225 kW (302 hp)
@ 4005-6000		 400 N·m (295 lb·ft)
@ 1200-4000		 7000 2009
N55B30 235 kW (315 hp)
@ 4505-6000		 450 N·m (332 lb·ft)
@ 1300-4500		 7000 2010
N55B30O0 240 kW (322 hp)
@ 4505-6000		 450 N·m (332 lb·ft)
@ 1300-4500		 7000 2011
N55HP 250 kW (335 hp)
@ 4505-6000		 450 N·m (332 lb·ft)
@ 1300-4500		 7000 2013
N55B30T0 265 kW (355 hp)
@ 5255-6000		 465 N·m (343 lb·ft)
@ 1350-5250		 7000 2015
Alpina N55R20A 301 kW (404 hp)
@ 5500-6250		 600 N·m (440 lb·ft) @
3000-4000		 7000 2013–2017
Alpina N55 324 kW (434 hp)
@ 5500-6250		 660 N·m (490 lb·ft) @
3000-4000		 7000 2017–
S55B30T0 317 kW (425 hp)
@ 5505-7300		 550 N·m (410 lb·ft)
@ 1850-5500		 7500 2015

N55B30M0 (225 kW)

Applications:

  • 2010-2013 E90/E91/E92/E92N/E93 335i
  • 2009–present F07 535i GT
  • 2010-2013 E82 135i
  • 2010-2013 E70 X5 xDrive 35i
  • 2010–present F25 X3 xDrive35i
  • 2013–2015 E84 X1 xDrive35i
  • 2010–2011 F10 535i
  • 2012–2015 BMW F30 335i
  • 2011–2014 E71 X6 xDrive 35i
  • 2014–present F16 X6 xDrive35i
  • 2014–present F26 X4 xDrive 35i
  • 2014–present F15 x5 xDrive 35i

N55B30 (235 kW)

Applications:

N55B30O0 (240 kW)

Applications:

N55HP (250 kW)

Applications:

  • 2013-2015 F30 ActiveHybrid 3

N55B30T0 (265 kW)

Applications:

  • 2015–present F26 X4 M40i

N55B30T0 (272 kW)

Applications:

  • 2016–present (2016) F87 M2

Alpina N55 (301 & 324 kW)

Biturbo engine by Alpina based on the N55B30M0. The crankcase is of a different design and specially cast by BMW for Alpina.[7]

N55R20A (301 kW)

Applications:

  • 2013–2017 Alpina F30/F31 B3 Bi-Turbo[8]
  • 2013–2017 Alpina F32 B4 Bi-Turbo
  • 2014–2017 Alpina F33 B4 Bi-Turbo

Second version (324 kW)

Applications:

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

Design

While its N54 predecessor uses parallel twin-turbochargers, the N55 uses a single twin scroll turbocharger.[9][10] BMW has used the term "TwinPower Turbo" to describe both twin-turbo and (single turbocharger) twin-scroll systems. Another difference is that the N55 has variable valve lift (called Valvetronic by BMW).[11] Displacement and peak power output are the same as the N54, however fuel economy is improved 15%, emissions have been reduced,[12] less turbo lag and better low-rev torque.[11][13]

As per the N54, 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). The compression ratio is 10.2:1. The N54's gasoline direct injection system uses piezo injectors, also used in the naturally-aspirated N53 (mostly European markets only), the N55's direct injection uses Bosch solenoid-type injectors. The piezo injectors were more expensive and BMW decided they were not worthwhile in North America, in contrast to Europe which they could perform lean burn to reach their full potential.[11]

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.[14]

The engine includes BOSCH MEVD 17.2 engine management, and supports ROZ(RON) 91-98 octane fuel types (recommended RON 95),[15][16] Valvetronic III (variable valve lift control) with double VANOS, direct injection and turbocharging. Turbocharging uses 2 sets of exhaust duct to turn 1 turbine wheel, with cylinders 1-3 and 4-6 combined to form 2 exhaust channels.[17]

The N55 is mated to ZF's 8-speed automatic transmission in later applications such as the 2011 535i and 2013 BMW 740i,[18] retaining the previous ZF 6-speed automatic transmission in earlier models. A 6-speed manual is usually available for sedans (excluding the 7-Series, and dropped for the 5 and 6 series for 2015), but not crossovers such as the X3, X5 and X6, and is of limited availability within the United States. The N55 engines in the 2011 BMW 135i and 2013 BMW 135is are mated to a Getrag 7-speed Dual-clutch transmission or a 6-speed manual transmission.[19][20]

S55

BMW S55

The S55 engine is the high performance version of the N55 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.[21][22]

S55B30T0 (317 kW)

S55B30T0 Design R6 Displacement 2979cm3 Power at speed 317kw=425hp 5500-7500 rpm Power output per liter (kw/l) 106.4 Torque at speed 550Nm at 1850-5500 rpm CR 10.2:1 fuel consumption (L/100KM) 8.3-8.8 CO2 emissions grams per km 194-204 Digital engine electronics MEVD17.2.G ULEV2

See also

References

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  19. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  20. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  21. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  22. ↑ Lua error in package.lua at line 80: module 'strict' not found.

External links

« previous — BMW road car engine timeline, 1980s-2000s — next »
1980s 1990s 2000s
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9
4-cylinder petrol << M10 M40 M43 N40 / N42 N43 / N45 / N46 >>
M42 M44
S14
6-cylinder petrol << M20 M50 M52 M54 / M56 N52 N53 >>
N54 N55 >>
S50 / S52 S54
<< M30
<< M88 / M90 S38
M102 M106
8-cylinder petrol M60 M62 N62 N63 >>
S62
S65 >>
10-cylinder petrol S85
12-cylinder petrol M70 M73 N73 N74 >>
S70
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