BMW N47

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

BMW N47 is a four-cylinder common rail diesel engine that has many improvements over its predecessor, the M47. In 2014 it was replaced with the B47.

First use

The N47 engine debuted in March 2007 in the facelifted 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

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 1598 cc (D16) and 1995 cc (D20) unit, the latter identical in capacity to the BMW M47TU/TU2 series.

115 bhp (86 kW; 117 PS) version

The 115 bhp (86 kW; 117 PS) tune is for the entry level E81 and E87 116d, as well as the entry level 3 Series E90 316d.

143 bhp (107 kW; 145 PS) version

The 143 bhp (107 kW; 145 PS) model was used in the

  • E81, E82, E87 and E88 118d
  • E90 and E91 318d
  • F20 118d
  • F30 and F31 318d
  • 2009-2015 BMW E84 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 (122 kW; 165 PS) version

A new 163 bhp (122 kW; 165 PS) 265 lb⋅ft (359 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 (132 kW; 179 PS) version

The "standard" x20d model has 14 extra bhp, at 177 bhp (132 kW; 179 PS) but 7 lb⋅ft (9 N⋅m) 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 PS; 181 hp) at 4000 rpm and 380 N⋅m (280 lb⋅ft) at 1750-2750 rpm.

Twin turbo version

In October 2007, BMW introduced a twin sequential turbo model. With 204 bhp (152 kW; 207 PS), it is the first production diesel on sale to achieve a specific output of over 100 bhp (75 kW; 101 PS) 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

Models
EngineDisplacementMinimum specific fuel consumption(g/kWh)Compression RatioEngine Weight(kg)PowerTorqueRedline(rpm)Injection Pressure(bar)Relative Boost(bar)MEP(bar)Maximum combustion chamber pressure(bar)Introduced in
N47D161.6 L (1598 cc/98 in³)16.5:170 kW (95 bhp) @ 4000 rpm235 N m (173 lb ft) @ 1500 - 2750 rpm2013
85 kW (116 bhp) @ 4000 rpm260 N m (192 lb ft) @ 1750 - 2500 rpm2012
N47D202.0 L (1995 cc/121 in³)19816.5:114985 kW (116 bhp) @ 4000 rpm260 N m (192 lb ft) @ 1750 rpm09/2009
105 kW (143 bhp) @ 4000 rpm300 N m (221 lb ft) @ 1750-3000 rpm500016001.51917003/2007
120 kW (163 bhp) @ 4000 rpm340 N m (265 lb ft) @ 2000 rpm180009/2009
130 kW (177 bhp) @ 4000 rpm350 N·m (258 lb ft) @ 1750-3000 rpm50001.52218003/2007
135 kW (184 bhp) @ 4000 rpm380 N·m (280 lb ft) @ 1750-2750 rpm50001.52218003/2010
16.1:1161150 kW (204 bhp) @ 4400 rpm400 Nm (295 lb ft) @ 2000 rpm520020002.025.320010/2007
16.5:1160 kW (218 bhp) @ 4400 rpm450 Nm (332 lb ft) @ 1500-2500 rpm2011

Timing chain problems

The N47 engine family is prone to excessive timing chain wear and premature failure.[3] 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. The most seriously affected units which require the most extensive repairs were produced from 01.03.2007 to 05.01.2009.[4] However there have been frequent reports of timing chain failure in 1, 3 and 5 series BMW engines manufactured from as early as 2004 until at least 2011 in both the petrol and diesel versions (and hence not just necessarily in the N47 engine). At times the failure has resulted in a dangerous cut out of the engine while the vehicle was being driven - sometimes at relatively high speed. A “Quality Enhancement” was issued by BMW for some, but not all vehicles, but has since been discontinued.

Other issues

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.

References

  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 2017-12-13.
  3. ↑ "BMW 1 Series E81/E87 2004 - Car Review". Honest John. Retrieved 2011-10-23.
  4. ↑ "BBC One - Watchdog - BMW deny engine failures are due to manufacturing fault". Bbc.co.uk. Retrieved 2017-01-23.
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