BMW M52

From Wikipedia, the free encyclopedia
  (Redirected from M52TUB25)
Jump to: navigation, search
BMW M52 engine
M52NonTUB28.jpg
Overview
Manufacturer BMW, Bayerische Motoren Werke AG
Production 1994–2001
Combustion chamber
Configuration Straight-6
Chronology
Predecessor BMW M50
Successor BMW M54

The BMW M52 is a straight-6 DOHC piston engine which replaced the M50. The M52 was produced from 1994-2001.

Compared with its M50 predecessor, the M52 uses a nikasil aluminium block (North American models used iron blocks, except in the Z3 which received an aluminum block with iron sleeves). Therefore the North American M52 is more akin to the M50TU.

In 1999, the M52TU ("technical update") was released, upgrading the variable valve timing to also adjust the exhaust camshafts (called "dual VANOS" by BMW). The M52TU holds a lot more in common with the M54[citation needed] including the head and block castings which are different,[clarification needed] universally aluminum with 1.5mm iron sleeves, reverse cooling, and a switchable intake manifold featuring a DISA.

The M52 and S52 engines were on the Ward's 10 Best Engines list from 1997 to 2000.[1]

The S52 engine, used in the 1996-1999 E36 M3 and in the 1998-2001 E36/7/8 M Roadster/M Coupe for the Canadian and USA markets, is based on the M52 engine (in other markets, the equivalent engine was a 3.2 litre version of the S50).

Nikasil problems with high sulfur fuels[edit]

In the USA the M52B used an iron block (except for the M52B28 in the Z3 which was an aluminum block), while the M52TU used an aluminium cylinder block. The aluminum M52 engine received criticism in some markets with high levels of sulfur in the petrol during the late 1990s. Sulfur has a corrosive effect on Nikasil and led to many early M52 engines having premature bore-liner wear, only the M60 and the European M52 engines were affected.[2][3] Engines destined for high-sulfur gasoline markets, the United States among three others countries, had cast iron cylinder liners in the aluminum block to cope with this problem. With the exception of the cylinder liners, the basic aluminum block of the M52 engine was the same for all markets. [4][5]

Models[edit]

Engine Displacement Power Torque Redline Year Stroke Bore Compression ratio
M52B20 1,991 cc (121.5 cu in) 110 kW (150 hp) @ 5900 190 N·m (140 lb·ft) @ 4200 6500 1994 66 mm (2.6 in) 80 mm (3.1 in) 11.0:1
M52TUB20 110 kW (150 hp) @ 5900 190 N·m (140 lb·ft) @ 3500 6500 1998 66 mm (2.6 in) 80 mm (3.1 in) 11.0:1
M52TUB24 2,394 cc (146 cu in) 135 kW (181 hp) @ 5800 240 N·m (180 lb·ft) @ 3600 6500 2000 72 mm (2.8 in) 84 mm (3.3 in)
M52B25 2,494 cc (152 cu in) 125 kW (168 hp) @ 5500 245 N·m (181 lb·ft) @ 3950 6500 1995 75 mm (3.0 in) 84 mm (3.3 in) 10.5:1
M52TUB25 125 kW (168 hp) @ 5500 245 N·m (181 lb·ft) @ 3500 6500 1998 75 mm (3.0 in) 84 mm (3.3 in) 10.5:1
M52B28 2,793 cc (170 cu in) 142 kW (190 hp) @ 5300 280 N·m (210 lb·ft) @ 3950 6500 1995 84 mm (3.3 in) 84 mm (3.3 in) 10.2:1
M52TUB28 142 kW (190 hp) @ 5500 280 N·m (210 lb·ft) @ 3500 6500 1998 84 mm (3.3 in) 84 mm (3.3 in) 10.2:1
S52B32 3,152 cc (192 cu in) 179 kW (240 hp) @ 6000 320 N·m (240 lb·ft) @ 3800 6500 1996 89.6 mm (3.53 in) 86.4 mm (3.40 in) 10.5:1

M52B20[edit]

A 1,991 cc (121 cu in) version was introduced in 1994. Bore is 80 mm (3.1 in) and stroke is 66 mm (2.6 in).[6]

Applications:

M52TUB20[edit]

The M52 was upgraded to dual-vanos in 1998, this improved low rpm torque.

Applications:

M52B24[edit]

2.4 L. For Thai market only.

Applications:

  • 1995-1999 E36 3-Series
  • 2000-2002 E39 5-Series (M52TU)

M52B25[edit]

A 2,494 cc (152 cu in) version introduced in 1995.[7] It produces 125 kW (168 hp). Bore is 84 mm (3.3 in) and stroke 75 mm (3.0 in).

Applications:

M52TUB25[edit]

The M52 was upgraded to dual-vanos in 1999, this improved low rpm torque.

Applications:

M52B28[edit]

The 2,793 cc (170 cu in) version of the M52 debuted in 1994. It has a bore of 84 mm (3.3 in), a stroke of 84 mm (3.3 in) and produces 142 kW (190 hp).[8]

Applications:

M52TUB28[edit]

The M52 was upgraded to dual-vanos in 1999, this improved low rpm torque.

Applications:

S52 (North American Market)[edit]

The S52 is a higher performance version of the M52 which was developed for the North American E36 M3. The S52 was a lower cost alternative to the S50B32 engine used for the E36 M3 produced for the rest of the world, which was based on the S50B30 rather than the M52.

Differences between the M52 and S52 engines[edit]

The North American-spec powerplant, known as the S52, is based closely on the US production M52 engine. Like that motor, the S52 is a six-cylinder with an iron block, The same aluminum head as the M52, with two-stage VANOS variable valve timing on the intake strokes. Unique to the S52 is a bore of 86.4 mm (3.4 in) and stroke of 89.6 mm (3.5 in) for a total displacement of 3,152 cc. The engine is rated at 240 hp (179 kW) at 6,000 rpm and 236 lb·ft (320 N·m) of torque at 3,800 rpm.=[9]

In addition to the larger displacement, the S52 utilizes the following special M components:

  • Piston Rings
  • Revised valve springs
  • Lighter, hollow camshafts with more lift and duration
  • Free-flowing exhaust system[citation needed]

Applications:

See also[edit]

References[edit]

  1. ^ "Wards 10 best engine". Wardsauto.com. Retrieved 2012-11-23. 
  2. ^ "BMW World - Nikasil". Usautoparts.net. Retrieved 2012-11-18. 
  3. ^ BMW Classics - http://www.bmwclassics.co.uk. "BMW Classics Ezine - News, Reviews & Cars for Sale". Bmwclassics.co.uk. Retrieved 2012-11-18. 
  4. ^ "BMW World - Nikasil". Usautoparts.net. Retrieved 2012-11-18. 
  5. ^ "BMW World - M52 Engine". Usautoparts.net. Retrieved 2012-11-22. 
  6. ^ "BMW Heaven Specification Database | Engine specifications for M52 engines". Bmwheaven.com. Retrieved 2012-11-18. 
  7. ^ "BMW Heaven Specification Database | Engine specifications for M52 engines". Bmwheaven.com. Retrieved 2012-11-18. 
  8. ^ "BMW 328i, 1999 E46 technical specifications 96228". Carfolio.com. Retrieved 2012-11-18. 
  9. ^ "FAQ E36/8 M coupe". BMW M Registry. Retrieved 2012-11-18. 

External links[edit]