The BMW N52 is a naturally aspirated straight-6 petrol engine which was produced from 2004-2015. The N52 replaced the M54 and debuted on the E90 330i and E63 630i.
The N52 was the first water-cooled engine to use magnesium in the engine block. It was also listed as one of Ward's 10 Best Engines in 2006 and 2007.
In European markets, the N52 began to be phased out following the release of the N53 in 2007. However, in markets such as the United States, Canada, Australia and Malaysia, the N53 was deemed unsuitable due to the high levels of sulfur in the fuel. Therefore, the N52 remained in production until it was replaced by the N20 turbocharged 4-cylinder engine in 2015. in 2015.
There is no M version of the N52.
Video BMW N52
Design
Compared with its M54 predecessor, the N52 features variable valve lift (called Valvetronic by BMW), a lighter block due to the use of a magnesium alloy and an electric water pump and a variable oil pump.
Like the M54, the N52 uses an electronic throttle control and variable valve timing on both camshafts (called dual VANOS by BMW). Higher output versions of the N52 use a three-stage variable length intake manifold (called "DISA" by BMW).
The N52 engine block is made from a combination of magnesium and aluminum. Magnesium is lighter than aluminium, however it has a greater risk of corrosion from water and may 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. The cylinder liners are made of Alusil.
Maps BMW N52
Models
N52B25
130 kW Applications:
- 2006 E90 323i (Canada only)
- 2005-2007 E60/E61 523i
- 2006-2008 E85 Z4 2.5i
150 kW Applications:
- 2007-2011 E90 323i (Canada only)
- 2010-2011 F10 523i
- 2009-2011 E89 Z4 sDrive23i
160 kW Applications:
- 2005-2010 E83 X3 2.5si, xDrive25i
- 2005-2010 E60/E61 525i, 525xi (except United States and Canada)
- 2005-2011 E90/E91/E92/E93 325i, 325xi (except United States and Canada)
- 2005-2008 E85 Z4 2.5si
N52B30
The 3.0 litre models of the N52 have a bore of 85 mm (3.3 in), a stroke of 88 mm (3.5 in) and a compression ratio of 10.7. Variations in power output are often due to different intake manifolds and variations of engine management software.
160 kW Applications:
- 2006-2007 E90/E92/E93 325i, 325xi (United States and Canada only)
- 2006-2007 E60/E61 525i, 525xi (United States and Canada only)
- 2006-2008 E85 Z4 3.0i (United States and Canada only)
- 2006-2011 E90/E92/E93 328i (United States and Canada only)
- 2008-2011 E82/E88 125i
- 2008-2011 E82/E88 128i (United States and Canada only)
- 2008-2010 E60/E61 528i, 528xi (United States and Canada only)
- 2009-2010 E84 X1 xDrive25i
180 kW Applications:
- 2010-2011 F10 528i
190 kW Applications:
- 2004-2007 E63/E64 630i
- 2004-2008 E90/E92/E93 330i, 330Ci, 330xi
- 2005-2009 E60/E61 530i, 530xi
- 2008-2011 E89 Z4 sDrive30i
- 2009-2011 E84 X1 xDrive28i
- 2009-2012 E87 130i
- 2010-2011 F25 X3 28i
195 kW Applications:
- 2005-2008 E85/E86 Z4 3.0si
- 2006-2009 E87 130i
200 kW Applications:
- 2006-2010 E83 X3 3.0si
- 2006-2010 E70 X5 3.0si, xDrive30i
- 2007-2010 E63/E64 630i
Lifter noise
There are several reports of ticking/rattling noises which have been caused by the hydraulic valve adjusters (also known as lifters or tappets). This noise can be caused by insufficient oil pressure to lubricate the lifters.
BMW's procedure for noisy lifters on the N52 is to first bleed the lifters by holding the engine at higher revs for up to 30 minutes. If this is unsuccessful, the lifters for the exhaust camshaft are replaced with an updated design. If this is also unsuccessful, the cylinder head is replaced with an updated design (which was fitted to engines produced since December 2008) that does not bleed oil pressure.
See also
- List of BMW engines
- List of BMW vehicles
References
Source of the article : Wikipedia
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