BMW M52

BMW M52

Infobox Automobile


M52TUB25 from an E46 323Ci (125 kW/245 Nm)
name=BMW M52 engine
manufacturer=BMW, Bayerische Motoren Werke AG
production=1994–2001
predecessor=BMW M50
successor=BMW M54
class=Straight-6
engine=
similar=Mercedes-Benz M104
The BMW M52 is a Straight 6 piston engine. Displacement ranges from 2000 cc to 3200 cc. It is a DOHC 24-valve engine, originally introduced with VANOS Variable Valve Timing. It replaced the BMW M50 engine in 1994 and was replaced in 2001 with the BMW M54 engine. The world market engine used Nikasil lined aluminium cylinders instead of a cast iron cylinder block, resulting in lighter engines. While, the American market engine retained its cast iron block due to the sulfur content of available fuel.

In markets with low-sulfur fuel this engine was very highly regarded and the M52 was on the Ward's 10 Best Engines list for 1995 through to 1998. However, there was criticism of the M52 engine in some markets, especially the UK, which had high levels of sulfur in the petrol during the late 90's. Sulfur acts as a corrosive agent against Nikasil and led to a lot of the early engines having premature bore-liner wear. In many situations the engine required a complete and expensive rebuild. BMW provided a retrospective warranty for many of the cars at great expense to themselves and paid for the work required to fix many of the engines. Fortunately this problem was solved in post-September 1998 cars with the introduction of steel cylinder liners, with the designation M52 TU-3. However problems still present in these engines so affected cars of this period should be bought with caution unless the service history verifies that work was carried out to rectify the problem. The American market M52 used a cast iron block, and so, was unaffected by this problem.

A "Technical Update" or "M52TU" version in 1999 added Double-VANOS and other modifications.

M52B20

A 2.0 L (1991 cc/121 in³) version was introduced in 1994. Bore is 80 mm and stroke is 66 mm.

Applications:
* 1994-1999 E36 320i
* 1995-1999 E39 520i

M52TUB20

Applications:
* E36/7 Z3 2.0i
* 1998-2002 E46 320i/320Ci
* 1998-2003 E39 520i

M52B24

2.4 L. For Thai market only.

Applications:
* 1995-1999 E36 3-Series
* 2000-2002 E39 5-Series (M52TU)

M52B25

A 2.5 L (2494 cc) version introduced in 1995. It produces 125 kW (170 hp). Bore is 84 mm and stroke is 75 mm.

Applications:
* 1995-2000 E36 323i/323ti
* 1995-1999 E39 523i

M52TUB25

Applications:
* 1997-2001 E46 323i/323Ci/323ti (M52T)
* 1998-2001 E39 523i (M52TU)
* 1998-2001 E36/7 Z3 (M52TU)

M52B28

A 2.8 L (2793 cc) version also debuted in 1994. It has square 84 mm bore and stroke and produces 193 hp (142 kW).

Applications:
* 1995-2000 E36 328i
* 1995-1999 E39 528i
* 1995-1999 E38 728i/728iL
* 1997-1999 E36/7 Z3 2.8

M52TUB28

Applications:
* 1997-2001 E46 328i/328Ci (M52TU)
* 1997-2001 E36/7 Z3 2.8 (M52B28/Z3)
* 1998-2001 E39 528i (M52TU)
* 1998-2001 E38 728i (M52TU)


=S52B32= The S52 is the 3.2 L M3 version of the M52. It produced Convert|240|hp|kW|0|abbr=on. Applications:
* 1996-1999 US-spec E36 M3
* 1996-2000 US-spec E36/7 M Roadster/M Coupe

ee also

* BMW engines
* BMW M50
* BMW M54

External links

* [http://www.bmwworld.com/engines/m52.htm The BMW M52 Engine at BMWworld.com]


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