BMW N47

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BMW N47
Overview
Manufacturer BMW
Production 2007-present
Combustion chamber
Configuration Straight-4 Diesel
Chronology
Predecessor BMW M47
Successor BMW B47
BMW N47D20

BMW N47 is a four-cylinder common rail diesel engine from BMW with many improvements over its predecessor, the BMW M47. In 2019 it is due to begin being replaced with the B47.

First use[edit]

The N47 engine debuted in March 2007 in the face lifted 1 Series BMW E87 and E81 and was available in the 1 Series BMW E82 and E88, which were introduced later in the same year.

Usage in other models[edit]

The engine also became available in the 5 Series BMW E60 and E61 from September 2007, several months after the 5 series was face lifted, during which time the older M47 remained available.

In the 2008 model year 3 Series E90/E91/E92/E93 when the entire 3 series range gained the company's Efficient Dynamics technology. Not long after it became available in the X3 and has since then become available in the X1.

The N47 comes as a 1995 cc unit, identical in capacity to the BMW M47TU/TU2 series.

115 bhp version[edit]

The 115 bhp tune is for the entry level E81 and E87 116d, as well as the entry level 3 Series E90 316d.

143 bhp version[edit]

The 143 bhp model was used in the

  • E81, E82, E87 and E88 118d
  • E90 and E91 318d
  • F20 118d
  • F30 and F31 318d
  • E84 X1 sDrive18d and xDrive18d
  • 2010–present MINI Countryman Cooper SD (R60)
  • 2010–present MINI Cooper SD (R56)
  • 2010–present MINI Cabrio Cooper SD (R57)
  • 2010–present MINI Coupe Cooper SD (R58)
  • 2012–present MINI Roadster Cooper SD (R59)
  • 2013–present MINI Paceman Cooper SD (R61)
  • X3 xDrive18d.

163 bhp version[edit]

A new 163 bhp/265 lb ft (360 N m) derivative was introduced in September 2009 for the 2010 model year. This version featured exceptionally low CO2 emissions of only 109 g/km and fuel consumption of 68.9 mpg[1]

This version was used in the E90 BMW 320d Efficient Dynamics

177 bhp version[edit]

The "standard" x20d model has 14 extra bhp, at 177 bhp but 7 lb ft of torque less at 258 lb ft(350 N m). This is found in the

In Europe, this particular version is one of the most popular engines in the entire range; the best selling 3 series is the 320d, while the 520d is the UK's best selling 5 series.[2]

The updated version of this engine introduced in March 2010 produces 135 kW/184 hp@4000 rpm and 380 Nm@1750-2750 rpm.

Twin turbo version[edit]

In October 2007, BMW introduced a twin sequential turbo model. With 204 bhp, it is the first production diesel on sale to achieve a specific output of over 100 bhp per liter. It uses the same turbo technology first shown in the E60 535d.

This engine is on sale in the E81/E82/E87/E88 123d and the E84 X1 xDrive 23d. This is the engine, which won the International Engine of the Year Award 2010.

Variants[edit]

Models
Engine Displacement Minimum specific fuel consumption(g/kWh) Compression Ratio Engine Weight(kg) Power Torque Redline(rpm) Injection Pressure(bar) Relative Boost(bar) MEP(bar) Maximum combustion chamber pressure(bar) Introduced in
N47D16 1.6 L (1598 cc/98 in³) 16.5:1 70 kW (95 bhp) @ 4000 rpm 235 N m (173 lb ft) @ 1500 - 2750 rpm 2013
85 kW (116 bhp) @ 4000 rpm 260 N m (192 lb ft) @ 1750 - 2500 rpm 2012
N47D20 2.0 L (1995 cc/121 in³) 198 16.5:1 149 85 kW (116 bhp) @ 4000 rpm 260 N m (192 lb ft) @ 1750 rpm 09/2009
105 kW (143 bhp) @ 4000 rpm 300 N m (221 lb ft) @ 1750-3000 rpm 5000 1600 1.5 19 170 03/2007
120 kW (163 bhp) @ 4000 rpm 340 N m (265 lb ft) @ 2000 rpm 1800 09/2009
130 kW (177 bhp) @ 4000 rpm 350 N·m (258 lb ft) @ 1750-3000 rpm 5000 1.5 22 180 03/2007
135 kW (184 bhp) @ 4000 rpm 380 N·m (280 lb ft) @ 1750-2750 rpm 5000 1.5 22 180 03/2010
16.1:1 161 150 kW (204 bhp) @ 4400 rpm 400 Nm (295 lb ft) @ 2000 rpm 5200 2000 2.0 25.3 200 10/2007
16.5:1 160 kW (218 bhp) @ 4400 rpm 450 Nm (332 lb ft) @ 1500-2500 rpm 2011

Future use[edit]

Rumors suggested that this engine will make its way into the E89, as a rival to Audi's TT TDI.[3]

BMW has held onto their straight 6 for the new F10/F11 525d, in the first phase of production of the car. Then in the 2nd part of 2011 the straight six was substituted by a diesel twin-turbo 2 litre developing 218 bhp and 450 Nm of torque, the same figure of the old straight six. The badge on the rear of the car says still 525d. Please note that this new 2.0 diesel twin.turbo develops 50 Nm and 14 bhp more than the old 123d engine (with 400Nm and 204 bhp).[4]

It is not yet known whether the new F10/F11 520d, featuring 184 bhp and 280 lb ft (380 Nm) is going to be designated N47 or N47TU.

Timing chain problems[edit]

The N47 engine family is prone to excessive timing chain wear and premature failure.[5] Rattling noise from the rear of the engine is indicative of the condition. Timing chain failure may call for engine replacement or a costly repair.[6] The issue applies to all applications and power variants of the engine produced from 01.03.2007 to 01.03.2013. The most seriously affected units which require the most extensive repairs were produced from 01.03.2007 to 05.01.2009.[7]

Other issues[edit]

The return spring on the turbo's waste-gate was not originally lubricated or covered, this frequently resulted in early failure causing the waste-gate to remain partially or fully open. With the subsequent loss in compression, fuel consumption increased by 30%-50%. The problem was described by BMW engineers as a "known fault" and was immediately repaired (BMW mobile engineers even carried boxes of an improved spring), however BMW refused to compensate customers for the excessive fuel consumption and denied this fault was their liability.[citation needed]

References[edit]

  1. ^ "BMW 320d EfficientDynamics Edition coming to Frankfurt with 57 mpg". egmCarTech. 2009-08-21. Retrieved 2010-09-13. 
  2. ^ "BMW 520d SE". FleetNews. 2007-10-17. Retrieved 2017-01-23. 
  3. ^ 14 October 2008 (2008-10-14). "Spied:BMW Z4". Autocar.co.uk. Retrieved 2010-09-13. 
  4. ^ "BMW UK | BMW 5 Series | New Saloon". Bmw.co.uk. 2009-11-30. Archived from the original on 22 September 2010. Retrieved 2010-09-13. 
  5. ^ "BMW 1 Series E81/E87 2004 - Car Review". Honest John. Retrieved 2013-10-23. 
  6. ^ "BMW N47 engine problem | BMW N47 timing chain problem | BMW approved used". YouTube. 2013-08-29. Retrieved 2013-10-23. 
  7. ^ "BBC One - Watchdog - BMW deny engine failures are due to manufacturing fault". Bbc.co.uk. Retrieved 2017-01-23. 

External links[edit]