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History

BMW N47 Straight-4 Diesel Engine

From 2007 on

 BMW N47 Straight-4 Diesel Engine  From 2007 on
 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.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.

The engine has an aluminum crankcase with thermally joined gray cast iron liners. To improve smoothness, two needle-bearing balancer shafts are integrated in the crankcase (not for the 85 kW version in the 116d). The four-valve cylinder head has two overhead camshafts that operate via roller rocker arms the valves. The common-rail injection system operates at pressures of 1600 to 2000 bar on the N47. The fuel is injected into the combustion chamber via centrally positioned solenoid valve injectors or piezo injectors. In most variants, a turbocharger with adjustable turbine vanes is installed, the most powerful stages (150 kW and 160 kW) have two turbochargersworking on a combined principle of register charging and multi-layer charging. The exhaust gases are cleaned by a diesel particulate filter arranged close to the engine with an upstream oxidation catalytic converter . 

The electronic engine control was also designed for the following efficiency-increasing measures:

  • Start-stop system
  • intelligent generator control for brake energy recovery
  • needs-based control of ancillary equipment
  • Shift Indicator

Variants

Models
Engine Displacement Compression Ratio Power Torque
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
85 kW (116 bhp) @ 4000 rpm 260 N m (192 lb ft) @ 1750 - 2500 rpm
N47D20 2.0 L (1995 cc/121 in³) 16.5:1 85 kW (116 bhp) @ 4000 rpm 260 N m (192 lb ft) @ 1750 rpm
105 kW (143 bhp) @ 4000 rpm 300 N m (221 lb ft) @ 1750-3000 rpm
120 kW (163 bhp) @ 4000 rpm 340 N m (265 lb ft) @ 2000 rpm
130 kW (177 bhp) @ 4000 rpm 350 N·m (258 lb ft) @ 1750-3000 rpm
135 kW (184 bhp) @ 4000 rpm 380 N·m (280 lb ft) @ 1750-2750 rpm
16.1:1 150 kW (204 bhp) @ 4400 rpm 400 Nm (295 lb ft) @ 2000 rpm
16.5:1 160 kW (218 bhp) @ 4400 rpm 450 Nm (332 lb ft) @ 1500-2500 rpm

 

engine type capacity Bore × stroke Power at 1 / min Torque at 1 / min Fuel injection year
N47D16 1.6 l (1598 cm 3 ) 78 mm × 83.6 mm 70 kW (95 hp) at 4000 235 Nm at 1500-2750 - since 09/2012
85 kW (116 hp) at 4000 260 Nm at 1750-2500 - since 2012
N47D20 2.0 l (1995 cm 3 ) 84 mm × 90 mm Solenoid injectors (1600 bar) since 2009
105 kW (143 hp) at 4000 300 Nm at 1750-2500 since 2007
320 Nm at 1750-2500 since 2010
350 Nm at 1750-2750 2009-2010
360 Nm at 1750-2500 since 2012
120 kW (163 hp) at 3250-4200 [1] 350 Nm at 1750-2500 Piezo injectors (1800 bar) [3] since 2007
120 kW (163 hp) at 4200 [1] 380 Nm at 1750-2750 since 2010
120 kW (163 hp) at 3250-4200 [2] since 2010
130 kW (177 hp) at 4000 350 Nm at 1750-3000 since 2007
145 kW (197 hp) at 4000 [3] 390 Nm at 2000-2500 since 2007
135 kW (184 hp) at 4000 380 Nm at 1900-2750 03 / 2010-09 / 2010
380 Nm at 1750-2750 since 09/2010
147 kW (200 hp) at 4000 [3] 420 Nm at 1750-2750 since 09/2010
150 kW (204 hp) at 4400 400 Nm at 2000-2250 Piezo injectors (2000 bar) since 2007
160 kW (218 hp) at 4400 450 Nm at 1500-2500 Piezo injectors (2000 bar) since 2011
  1. ↑ Edition Fleet
  2. ↑ Efficient Dynamics Edition
  3. ↑ with Performance Power Kit BMW offers power kits from BMW Performance for some models for these diesel engines. This is possible with the models 120d (E81, E82, E87, E88) and 320d (E90, E91, E92, E93) with 177 hp, which make 197 hp (145 kW) after the revision. The maximum torque increases by 40 to 390 Newton meters. From March 2010, the power kit will also be available for the ex-factory 184 hp (135 kW) expansion of the N47, which will provide 200 hp (147 kW) after the revision. The maximum torque increases by 40 to 420 Newton meters.


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.

BMW N47 Straight-4 Diesel Engine  specs

115 bhp 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

MINI diesel engine specification

Engine Size 1995cc
Cylinders 4
Valves 16
Fuel Type Diesel
Power 140 bhp
Top Speed 134 mph
0-60 mph 7.6 secs
Torque 305 Nm, 225 ft-lb
CO2 Emissions 114 g/km
Euro Emissions Standard 5

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

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

177 bhp version

BMW X3 xDrive20d. engine specification

Engine Size 1995cc
Cylinders 4
Valves 16
Fuel Type Diesel
Power 174 bhp
Top Speed 128 mph
0-60 mph 8.6 secs
Torque 350 Nm, 258 ft-lb
CO2 Emissions 172 g/km
Euro Emissions Standard 5

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.

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

BMW N47 Straight-4 Diesel Engine types

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.

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 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.

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.

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BMW 5 Series | BMW X Series | BMW 3 Series | BMW 1 Series | Mini related | Straight-4 Engines | BMW Straight 4 | BMW diesel Engines | Diesel engines

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