BMW N47
| BMW N47 | |
|---|---|
| Overview | |
| Manufacturer | BMW |
| Production | 2007-present |
| Combustion chamber | |
| Configuration | Straight-4 Diesel |
| Chronology | |
| Predecessor | BMW M47 |
| Successor | BMW B47 |
BMW N47 is a four-cylinder common rail diesel engine from BMW, with many improvements over its predecessor, the BMW M47. In 2014 it is due to begin being replaced with the B47.
First use
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
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.
115bhp version
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
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
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
177bhp version
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
- 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.[2]
The updated version of this engine introduced in March 2010 produces 135 kW/184 hp@4000rpm and 380Nm@1750-2750rpm.
Twin turbo version
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
| 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
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 N m) is going to be designated N47 or N47TU.
Timing chain problems
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 01.03.2011. The most seriously affected units which require the most extensive repairs were produced from 01.03.2007 to 05.01.2009. UPDATE - It now seems that there are issues appearing with a limited number of engines manufactured after the supposed sale date of 01.03.2011.[7]
Other Issues
"Swirl flaps" used in the intake manifold have been known to fracture with age and the particles become ingested in the engine, leading to a very expensive repair. These were removed after 2009 designs.
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
- ↑ "BMW 320d EfficientDynamics Edition coming to Frankfurt with 57 mpg". egmCarTech. 2009-08-21. Retrieved 2010-09-13.
- ↑
- ↑ 14 October 2008 (2008-10-14). "Spied:BMW Z4". Autocar.co.uk. Retrieved 2010-09-13.
- ↑ "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.
- ↑ "BMW 1 Series E81/E87 2004 - Car Review". Honest John. Retrieved 2013-10-23.
- ↑ "BMW N47 engine problem | BMW N47 timing chain problem | BMW approved used". YouTube. 2013-08-29. Retrieved 2013-10-23.
- ↑ "BBC One - Watchdog - BMW deny engine failures are due to manufacturing fault .in 2012 they give a measure plan to all dealers to repair instruction for timing chain noise .you don't need replace engine. just replace the timing chain". Bbc.co.uk. Retrieved 2013-10-23.
External links
- The UnixNerd's BMW N47 engine page with photos, history and common problems.