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BMW N52

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BMW N52 engine
Overview
ManufacturerBMW, Bayerische Motoren Werke AG
Production2004–2015
Layout
ConfigurationStraight-6
Chronology
PredecessorBMW M54
SuccessorBMW N53 (except North America, Australia and Malaysia),
BMW N20 (North America, Australia and Malaysia)

The BMW N52 is a straight-6 DOHC piston engine which was produced from 2004-2015. It debuted on the E90 330i and E63 630i. In European markets, it began to be phased out following the release of the N53 in 2007. However, in markets such as North America, Australia or Malaysia,[1] the N53 was deemed unsuitable due to the high levels of sulfur in the fuel. Therefore, the N52 remained in production until its replacement by the N20 turbocharged 4-cylinder engine[2] in 2015.

Compared with its M54 predecessor, the N52 features variable valve lift (called Valvetronic by BMW),[3] a lighter block due to the use of a magnesium alloy[4] and an electric water pump and a variable oil pump.[5] Like the M54, the N52 uses an electronic throttle control, variable valve timing to both camshafts (called dual VANOS by BMW) and a dual length intake manifold (called "DISA" by BMW).

Design

The N52 engine block is cast with magnesium and aluminum for the crankcase. Magnesium is used to save weight, however magnesium is subject to a greater risk of corrosion from water. Moreover, magnesium may tend to creep under load at high temperatures. Thus, magnesium in its pure form or as a conventional alloy is not suited for permanently conveying high loads and forces of the kind typically encountered in central components of the engine. Therefore, BMW combined the N52 block to use magnesium alloy for the crankcase shell, with an aluminum “inner block” to complement the magnesium disadvantages.[5][6]

For the cylinder liners the N52 Engine uses Alusil to coat the aluminum cylinder sleeves. Alusil is an aluminium alloy commonly used to make linerless aluminium alloy engine blocks. Alusil, when etched, will expose a very hard silicon precipitate. BMW switched from Nikasil-coated cylinder walls to Alusil in 1996 to eliminate the corrosion problems caused through the use of petrol or gasoline containing sulphur.[7]

Hydraulic valve adjuster problems

The ticking noise of Hydraulic valve adjuster is a known problem with the N52 engine fitted with manufacturing date prior to November 2008. An occasional ticking or rattling noise from the HVA elements may occur during cold engine starts or frequent short-distance driving, recently known after the engines reach 50,000 miles. In these situations, the HVA elements may not yet have been supplied with sufficient amounts of air-free oil. This condition will not cause any damage to the engine, and usually remedies itself with a longer driving distance or operating times at full operating temperature. BMW dealers' first response is to perform HVA bleeding procedure, however this procedure seems not to resolve the matter. The second attempt to solve this problem is a replacement with improved HVA parts, however this procedure also does not fully address the problem. Finally, a newly designed cylinder head replacement solves the ticking noise problem for vehicles under warranty. Vehicles produced after November, 2008 have already been fitted with the improved cylinder heads that resolve this HVA problem.[8]

Models

Engine Displacement Power Torque Bore Stroke CR Year
N52B25 2,497 cc (152.4 cu in) 130 kW (170 hp) @ 5800 230 N⋅m (170 lb⋅ft) @ 3500-5000 82 mm (3.2 in) 78.8 mm (3.1 in) 11.0 2005
150 kW (200 hp) @ 6400 250 N⋅m (184 lb⋅ft) @ 2750 82 mm (3.2 in) 78.8 mm (3.1 in) 11.0 2009
160 kW (210 hp) @ 6500 250 N⋅m (180 lb⋅ft) @ 2750-4250 82 mm (3.2 in) 78.8 mm (3.1 in) 11.0 2005
N52B30 2,996 cc (183 cu in) 160 kW (210 hp) @ 6100 270 N⋅m (200 lb⋅ft) @ 2500-4250 85 mm (3.3 in) 88 mm (3.5 in) 10.7 2008
160 kW (210 hp) @ 6100 280 N⋅m (210 lb⋅ft) @ 2500-3500 85 mm (3.3 in) 88 mm (3.5 in) 10.7 2010
170 kW (230 hp) @ 6500 270 N⋅m (200 lb⋅ft) @ 2750 85 mm (3.3 in) 88 mm (3.5 in) 10.7 2007
190 kW (250 hp) @ 6600 300 N⋅m (220 lb⋅ft) @ 2500-4000 85 mm (3.3 in) 88 mm (3.5 in) 10.7 2004
190 kW (250 hp) @ 6600 310 N⋅m (230 lb⋅ft) @ 2600 85 mm (3.3 in) 88 mm (3.5 in) 10.7 2009
195 kW (261 hp) @ 6600 315 N⋅m (232 lb⋅ft) @ 2750-4250 85 mm (3.3 in) 88 mm (3.5 in) 10.7 2006
200 kW (270 hp) @ 6650 315 N⋅m (232 lb⋅ft) @ 2750 85 mm (3.3 in) 88 mm (3.5 in) 10.7 2006

N52B25

N52B25 from a BMW 325 Coupé

130 kW Applications:[9]

  • 2005-2008 E90 323i
  • 2005-2007 E60/E61 523i (except North America)
  • 2006-2008 E85 Z4 2.5i

150 kW Applications:

  • 2009-2011 F10 523i sedan (except North America)
  • 2009-2011 E89 Z4 sDrive23i (except North America)

160 kW Applications:

  • 2005-2010 E83 X3 2.5si, xDrive25i (except North America)
  • 2005-2010 E60/E61 525i, 525xi (except North America)
  • 2005-2011 E90/E91/E92/E93 325i, 325xi (except North America)
  • 2005-2008 E85 Z4 2.5si

N52B30

N52B30 from a BMW Z4 3.0si

Output variances are achieved by fitting different resonant intake manifolds and variations of engine management software.[10]

The N52B30 was awarded as one of Ward's 10 Best Engines of the Year in 2006 and 2007.[11]

160 kW Applications:

  • 2004-2007 E90/E92/E93 325i, 325xi (North America only)
  • 2005-2010 E60/E61 525i, 525xi (North America only)
  • 2005-2008 BMW E85 Z4 3.0i (North America only)
  • 2009-2010 E84 X1 xDrive25i
  • 2008-2011 E82/E88 125i coupe and cabriolet
  • 2010-2011 F10 528i Sedan (North America only)[12][13]

170 kW Applications:

  • 2008-2011 E82/E88 128i coupe and cabriolet[14] (North America only)
  • 2006-2011 E90/E92/E93 328i (North America only)
  • 2008-2011 E60/E61 528i, 528xi (North America only)

190 kW Applications:

195 kW Applications:

  • 2005-2008 E85/E86 Z4 3.0si
  • 2006-2009 E87 130i hatchback

200 kW Applications:

  • 2006–2010 E83 X3 3.0i
  • 2006-2010 E70 X5 3.0si, xDrive30i
  • 2007-2010 E63/E64 630i

See also

References

  1. ^ "BMW's N52 versus N53 – what are we missing?". paultan.org.
  2. ^ "BMW N20 turbo 4 cylinder versus N52 naturally aspirated 6 cylinder". bimmerboost.com.
  3. ^ "BMW N52 and N53 24 Valve Six Cylinder Engines". unixnerd.demon.co.uk.
  4. ^ "2007 BMW 525xi". conceptcarz.com.
  5. ^ a b "Inside the N52 Engine". mwerks.com.
  6. ^ "BMW Pushes Lightweight Technology with Magnesium". Motor1.com.
  7. ^ "Nikasil Cylinders". www.looking4spares.co.za.
  8. ^ "BMW E90 valve train (lifter) tick/noise". RTSauto.com.
  9. ^ "Engine specifications- N52". bmwheaven.com.
  10. ^ "2007 BMW Z4". conceptcarz.com.
  11. ^ "Ward's Auto releases annual 10 Best Engines list". autoblog.com.
  12. ^ "2011 BMW 528i - Short Take Road Test". caranddriver.com.
  13. ^ "Test Drive: 2011 BMW 528i". autos.ca.
  14. ^ "2009 BMW 1 Series - Features & Specs". edmunds.com.
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