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.
Usage in other models
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
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[clarification needed]
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
- E81/E82/E87/E88 120d
- E90/E91/E92/E93 320d
- 5 Series E60 and E61 520d
- E84 X1 X1 sDrive20d, X1 xDrive20d and E83 X3 xDrive20d.
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.
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.
|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|
Timing chain problems
The N47 engine family is prone to excessive timing chain wear and premature failure. 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. 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.
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.
- "BMW 320d EfficientDynamics Edition coming to Frankfurt with 57 mpg". egmCarTech. 2009-08-21. Retrieved 2010-09-13.
- "BMW 520d SE". FleetNews. 2007-10-17. Retrieved 2017-12-13.
- "BMW 1 Series E81/E87 2004 - Car Review". Honest John. Retrieved 2011-10-23.
- "BBC One - Watchdog - BMW deny engine failures are due to manufacturing fault". Bbc.co.uk. Retrieved 2017-01-23.
- The UnixNerd's BMW N47 engine page with photos, history and common problems.