BMW M50

Last updated
BMW M50 engine
1993 bmw 325is engine.jpg
Overview
Production1990–1996
Layout
Configuration Straight-6
Displacement 1,991  cc (121  cu in)
2,394  cc (146  cu in)
2,494  cc (152  cu in)
Cylinder bore 80 mm (3.1 in)
84 mm (3.3 in)
Piston stroke 66 mm (2.6 in)
72 mm (2.8 in)
75 mm (3.0 in)
Cylinder block materialCast iron
Cylinder head materialAluminium
Valvetrain DOHC,
VVT ("TÜ" versions only)
Combustion
Fuel type Petrol
Chronology
Predecessor BMW M20
Successor BMW M52

The BMW M50 is a straight-6 DOHC petrol engine which was produced from 1990 to 1996. It was released in the E34 520i and 525i, to replace the M20 engine. [1]

Contents

In September 1992, the M50 was upgraded to the M50TÜ (Technische Überarbeitung, "technical revision"). This was BMW's first engine to use variable valve timing. [2] Called single VANOS by BMW, the system adjusted the phasing of the intake camshaft. [3]

The M50 began to be phased out following the introduction of the M52 engine in 1994.

The E36 M3 is powered by the S50 engine series, which is a high output version of the M50.

Design

Initial version of the M50 (prior to 1992 Technical Update) BMW E34 Touring Lazurblau 1993 4.jpg
Initial version of the M50 (prior to 1992 Technical Update)

A significant advance over its M20 predecessor, the M50 features dual overhead camshaft (DOHC) with four valves per cylinder (the M20 has a single overhead camshaft with 2 valves per cylinder), coil-on-plug ignition, a knock sensor and a lightweight plastic intake manifold. [4] Both engines use an iron block with an aluminum alloy head. [5] The redline is 6,500 rpm for the M50B25 and 6,750 rpm for the M50B20 (7,000 rpm for S50 models), the same as the final version of the M20.

The location of the oil pan (sump) varies according to the model the M50 is installed in. It is in the front on the E34 5 Series (like the M20), [6] whereas it is in the rear on the E36 3 Series. [7]

Models

EngineDisplacementPowerTorqueYears
M50B201,991 cc (121.5 cu in)110 kW (150 PS; 148 hp)
at 6,000 rpm		190 N⋅m (140 lb⋅ft)
at 4,700 rpm		1990-1992
M50B20TÜ110 kW (150 PS; 148 hp)
at 5,900 rpm		190 N⋅m (140 lb⋅ft)
at 4,200 rpm		1992-1996
M50B24TÜ2,394 cc (146.1 cu in)138 kW (188 PS; 185 hp)
at 5,900 rpm		240 N⋅m (180 lb⋅ft)
at 4,200 rpm
M50B252,494 cc (152.2 cu in)141 kW (192 PS; 189 hp)
at 6,000 rpm		245 N⋅m (181 lb⋅ft)
at 4,700 rpm		1990-1992
M50B25TÜ141 kW (192 PS; 189 hp)
at 5,900 rpm		250 N⋅m (180 lb⋅ft)
at 4,200 rpm		1992-1996
S50B30 (EU)2,990 cc (182.5 cu in)210 kW (286 PS; 282 hp)
at 7,000 rpm [a] 		329 N⋅m (243 lb⋅ft)
at 3,500 rpm		1992-1995
S50B30 (US)240 hp (180 kW; 240 PS)
at 6,000 rpm		225 lb⋅ft (305 N⋅m)
at 4,250 rpm		1994-1995
S50B30GT217 kW (295 PS; 291 hp)
at 7,100 rpm		323 N⋅m (238 lb⋅ft)
at 3,900 rpm		1994-1995
S50B323,201 cc (195.3 cu in)236 kW (321 PS; 316 hp)
at 7,400 rpm		350 N⋅m (260 lb⋅ft)
at 3,250 rpm		1995-2000

M50B20

M50 engine in BMW Museum BMW M50 engine in BMW-Museum in Munich, Bayern.JPG
M50 engine in BMW Museum

The 1,991 cc (121.5 cu in) M50B20 was introduced with the 1990 520i. It has a bore of 80 mm (3.15 in), a stroke of 66 mm (2.60 in) and produces 110 kW (150 PS; 148 hp). The compression ratio is 10.5:1. [8]

Applications:

M50B20TÜ

The M50B20 was updated with single VANOS in 1992. Peak torque became available at 4,200 rpm. [8] It produces 110 kW (150 PS; 148 hp) at 5,900 rpm and 190 N⋅m (140 lb⋅ft) at 4,200 rpm. The compression ratio was raised to 11.0:1.

Applications:

M50B24TÜ

This is a 2,394 cc (146.1 cu in) engine used in the Thailand and Oceanian markets. [9] It is based on the 2,494 cc (2.5 L) M50B25TÜ with the stroke reduced to 72 mm (2.83 in) and produces 138 kW (188 PS; 185 hp) at 5,900 rpm and 240 N⋅m (180 lb⋅ft) at 4,200 rpm. The compression ratio is 10.5:1.

Applications:

M50B25

The 2,494 cc (152.2 cu in) M50B25 was introduced with the 1990 525i and 525ix. It has a bore of 84 mm (3.31 in), a stroke of 75 mm (2.95 in) and produces 141 kW (192 PS; 189 hp) at 6,000 rpm and 245 N⋅m (181 lb⋅ft) at 4,700 rpm. [8] The compression ratio is 10.0:1.

Applications:

M50B25TÜ

The M50B25 was updated with single VANOS in 1992, resulting in peak torque becoming available at 4,200 rpm. It produces 141 kW (192 PS; 189 hp) at 5,900 rpm and 250 N⋅m (180 lb⋅ft) at 4,200 rpm. [8] The compression ratio was increased to 10.5:1.

Applications:

M50B30TÜ concept

In 1993, BMW Individual created a concept of BMW E34 530iX called Enduro Touring. Only one car was produced, having an up-sized variant of M50B25TÜ engine. Bore and stroke was increased and the total displacement of 3.0 was achieved. The power and torque both increased to 181 kW (246 PS; 243 hp) and 316 N⋅m (233 lb⋅ft) respectively.

S50

BMW S50 engine
BMW M3 Evo Coupe E36 - Flickr - The Car Spy (5).jpg
Overview
Production1992–2000 [10]
Layout
Configuration Straight-6
Displacement 2,990  cc (182  cu in)
3,201  cc (195  cu in)
Cylinder bore 86 mm (3.4 in)
86.4 mm (3.40 in)
Piston stroke 85.8 mm (3.38 in)
91 mm (3.6 in)
Cylinder block materialCast iron
Cylinder head materialAluminium
Valvetrain DOHC, with VVT
Combustion
Fuel type Petrol
Chronology
PredecessorNone
Successor BMW S54

The S50 is the high performance version of the M50 which was used in the E36 M3, replacing the four-cylinder BMW S14 engine used in the E30 M3. Like the M50, the S50 has an iron block and aluminum head with four valves per cylinder.

In the United States, a less powerful engine called the "S50B30US" was used, which shares more in common with the regular M50 engine than the other S50 versions.

S50B30

The S50B30 was used in most countries, except for the United States. [b] The S50B30 produces 210 kW (286 PS; 282 hp), has a bore of 86 mm (3.39 in), a stroke of 85.8 mm (3.38 in) and a compression ratio of 10.8:1. [13] [14] The redline is 7,200 rpm. The S50 has an individual throttle body for each cylinder, single-VANOS (variable valve timing on the intake camshaft), Bosch Motronic M3.3 engine management and redesigned intake and exhaust systems. [11] [15]

The limited edition "M3 GT" model from 1995 produced 220 kW (299 PS; 295 hp). [11] It had different camshafts and a redesigned sump and oil pump.

Applications:

S50B30US

In the United States, the 1994-1995 model years of the E36 M3 are powered by the S50B30US, a 2,990 cc (182.5 cu in) engine which produces 179 kW (243 PS; 240 hp). [11] [16] This engine is more closely related to the standard M50 engine and has the same compression ratio as the M50B25TÜ, [11] but uses a different camshafts, crankshaft, connecting rods, and pistons. The bore is 86 mm (3.39 in), the stroke is 85.8 mm (3.38 in) and the redline is 7,000 rpm. [17]

In 1996, the S50B30US was replaced by the BMW S52 engine (in the United States and Canada only). [18]

Applications:

S50B32

In 1995, the S50B32 replaced the S50B30 in world markets. [c] Power output increased to 236 kW (321 PS; 316 hp) [20] and the displacement increased to 3.2 L; 195.3 cu in (3,201 cc), due to an increased stroke of 91 mm (3.58 in) and a slight increase in bore to 86.4 mm (3.40 in). [21]

The S50B32 has double-VANOS (variable valve timing on both camshafts) and a secondary oil pick-up was added. [22] The compression ratio is 11.3:1 and the redline is 7,600 rpm. [23] Engine management is the Siemens MSS50, with 3 knock sensors.

Applications:

See also

Notes

  1. ↑ U.S. models were produced from 1993-1995 and were rated at 240 hp (180 kW; 240 PS) at 6,000 rpm and 305 N⋅m (225 lb⋅ft) at 4,250 rpm.
  2. ↑ In 1993, BMW Canada officially imported 45 M3 coupes with the S50B30 engine. [11] [12]
  3. ↑ United States and Canada received the BMW S52 instead. [19]

Related Research Articles

<span class="mw-page-title-main">BMW 5 Series (E34)</span> Third generation of the BMW 5 Series

The BMW E34 is the third generation of the BMW 5 Series, which was produced from 2 November 1987, until 1996. Initially launched as a saloon in January 1988, the E34 also saw a "Touring" station wagon (estate) body style added in September 1992, a first for the 5 Series. BMW replaced the E34 with the E39 5 Series in December 1995, although E34 Touring models remained in production until June 1996.

<span class="mw-page-title-main">BMW M30</span> Reciprocating internal combustion engine

The BMW M30 is a SOHC straight-six petrol engine which was produced from 1968 to 1995. With a production run of 27 years, it is BMW's longest produced engine and was used in many car models.

<span class="mw-page-title-main">BMW M10</span> Reciprocating internal combustion engine

The BMW M10 is a SOHC inline-4 petrol engine which was produced by BMW from 1962-1988. It was the company's first four-cylinder engine since the BMW 309 ended production in 1936 and was introduced in the New Class sedans.

<span class="mw-page-title-main">BMW M20</span> Reciprocating internal combustion engine

The BMW M20 is a SOHC straight-six petrol engine which was produced from 1977 to 1993. It was introduced eight years after the larger BMW M30 straight-six engine, which remained in production alongside the M20.

<span class="mw-page-title-main">BMW M43</span> Reciprocating internal combustion engine

The BMW M43 is an SOHC four-cylinder petrol engine which was produced from 1991-2002. The M43 powered base-model cars, while higher performance models at the time were powered by the BMW M42 and BMW M44 DOHC engines. The M43 was produced at the Steyr engine plant.

<span class="mw-page-title-main">BMW M52</span> Reciprocating internal combustion engine

The BMW M52 is a straight-6 DOHC petrol engine which was produced from 1994 to 2000. It was released in the E36 320i, to replace the M50. The BMW S52 engine is a high performance variant of the M52 which powered the American and Canadian market E36 M3 from 1996 to 1999.

<span class="mw-page-title-main">BMW M88</span> Reciprocating internal combustion engine

The BMW M88 is a straight-6 DOHC petrol engine which was produced from 1978 to 1989. It is based on the DOHC version of the BMW M49 engine, which was used in the BMW 3.0CSi racing cars.

<span class="mw-page-title-main">BMW M62</span> Reciprocating internal combustion engine

BMW M62 is a naturally aspirated V8 petrol engine which was produced from 1995 to 2005. A successor to the BMW M60, the M62 features an aluminium engine block and a single row timing chain.

<span class="mw-page-title-main">BMW S38</span> Reciprocating internal combustion engine

The BMW S38 is a straight-6 DOHC petrol engine which replaced the M88 and was produced from 1984–1995. The S38 was originally produced for North America as an equivalent to the M88 with slightly lower power output. In 1989, power output of the S38 was increased and it became the worldwide replacement for the M88.

<span class="mw-page-title-main">BMW 3 Series (E30)</span> Second generation of BMW 3 Series

The BMW E30 is the second generation of BMW 3 Series, which was produced from 1982 to 1994 and replaced the E21 3 Series. The model range included 2-door coupe and convertible body styles, as well as being the first 3 Series to be produced in 4-door saloon and wagon/estate body styles. It was powered by four-cylinder petrol, six-cylinder petrol and six-cylinder diesel engines, the latter a first for the 3 Series. The E30 325iX model was the first BMW to have all-wheel drive.

<span class="mw-page-title-main">BMW 3 Series (E36)</span> Third generation of BMW 3 Series

The third generation of the BMW 3 Series range of compact executive cars is designated under the model code E36, and was produced by the German automaker BMW from 1990 to 2000. The initial models were of the four-door saloon body style, followed by the coupé, convertible, wagon ("Touring"), and eventually hatchback ("Compact").

<span class="mw-page-title-main">BMW M3</span> High-performance version of the BMW 3 Series automobile

The BMW M3 is a high-performance version of the BMW 3 Series, developed by BMW's in-house motorsport division, BMW M GmbH. M3 models have been produced for every generation of 3 Series since the E30 M3 was introduced in 1986.

<span class="mw-page-title-main">BMW M54</span> Reciprocating internal combustion engine

The BMW M54 is a naturally aspirated straight-6 DOHC petrol engine produced from 2000 to 2006. It was released in the E53 X5 and is the replacement for the M52 engine. The S54 is the equivalent high performance engine, used in the E46 M3, the Z3 M Coupé/Roadster and the E85/E86 Z4 M. The BMW M56 SULEV engine is based on the M54.

<span class="mw-page-title-main">BMW M Coupé and Roadster</span> High performance variants of the BMW Z3 and Z4 coupé and roadster

The BMW M Coupé and BMW M Roadster are high performance models of the BMW Z3 and Z4 coupés/roadsters produced by BMW M. The first generation was based on the Z3 and was produced between 1998 and 2002. The second generation was based on the Z4 and was produced between 2006 and 2008.

<span class="mw-page-title-main">Honda F engine</span> Reciprocating internal combustion engine

The Honda F-Series engine was considered Honda's "big block" SOHC inline four, though lower production DOHC versions of the F-series were built. It features a solid iron or aluminum open deck cast iron sleeved block and aluminum/magnesium cylinder head.

<span class="mw-page-title-main">BMW N52</span> Straight-6 DOHC piston engine

The BMW N52 is a naturally aspirated straight-6 petrol engine which was produced from 2004 to 2015. The N52 replaced the BMW M54 and debuted on the E90 3 Series and E63 6 Series.

<span class="mw-page-title-main">BMW M60</span> V8 DOHC piston engine produced by BMW between 1992 and 1996

The BMW M60 is a naturally aspirated V8 petrol engine which was produced from 1992 to 1996. It was BMW's first V8 engine in over 25 years.

5HP is ZF Friedrichshafen AG's trademark name for its 5-speed automatic transmission models for longitudinal engine applications, designed and built by ZF's subsidiary in Saarbrücken.

<span class="mw-page-title-main">Alpina B3</span> Motor vehicle

The Alpina B3 are a series of high performance executive cars manufactured by German automobile manufacturer Alpina, which is based on the BMW 3 Series of the car manufacturer BMW. As of 2021, it is produced as a sedan (four-door) and station wagon (touring). Up to and including the E90 series, two-door sedans, coupes and convertibles were also offered. With the exception of the convertible, every model was optionally available with all-wheel drive. The current diesel variant runs under the Alpina D3 Biturbo.

References

  1. ↑ "BMW 5 Series E34 History and Characteristics". www.bmwguide.net. 16 February 2015. Retrieved 27 October 2017.
  2. ↑ "Diagnosing a Failing BMW Vanos System". www.bmwn54tuners.com. 5 December 2017. Retrieved 15 December 2018.
  3. ↑ "BMW M50 engine". www.usautoparts.net. Archived from the original on 2012-05-12.
  4. ↑ "BMW M50 M52 M54 Engines". www.unixnerd.demon.co.uk. Archived from the original on 2018-09-27. Retrieved 2015-11-03.
  5. ↑ "The BMW Six Cylinder Guide". www.autospeed.com. Archived from the original on 2012-03-29. Retrieved 2012-06-24.
  6. ↑ "5' E34 525i Short Engine". www.realoem.com. Retrieved 28 September 2017.
  7. ↑ "3' E36 325i Short Engine". www.realoem.com. Retrieved 28 September 2017.
  8. 1 2 3 4 "Engine specifications- M50". www.bmwheaven.com.[ dead link ]
  9. ↑ Hudock, Greg (14 October 2012). BMW E - Series Restoration Bible. Brooklands Books. p. 8-6. ISBN   9781855209701.
  10. ↑ "BMW S50B32 automotive engine". bmw-grouparchiv.de. Retrieved 18 June 2019.
  11. 1 2 3 4 5 "BMW M Registry - FAQ E36 M3 3.0". www.bmwmregistry.com.
  12. ↑ "1 of 45: 1994 BMW M3 Canadian Edition". www.germancarsforsaleblog.com. 18 August 2016. Retrieved 29 September 2017.
  13. ↑ "BMW E36 3 Series Coupe M3 Specs". www.ultimatespecs.com. Retrieved 1 October 2017.
  14. ↑ "1993 BMW M3 E36". www.carfolio.com.
  15. ↑ "BMW S50 in all its glory". www.drive-my.com. 30 October 2014. Retrieved 15 December 2018.
  16. ↑ "Engine specifications- S50 B30 US". www.bmwheaven.com.
  17. ↑ "1994 BMW E36 3 Series Coupe M3 Automatic (US spec)". www.ultimatespecs.com.
  18. ↑ "E36 M3 coupe model selection- March 1996 in US spec". www.realoem.com.
  19. ↑ "1995-1999 BMW M3". www.motortrend.com.
  20. ↑ "BMW M3 Coupé, 321 PS (E36)". bmw-grouparchiv.de. Retrieved 4 January 2021.
  21. ↑ "Engine specifications- S50B32 Euro". www.bmwheaven.com.
  22. ↑ "FAQ E36 M3 3.2". www.bmwmregistry.com. Retrieved 1 October 2017.
  23. ↑ "BMW M Registry - FAQ E36/8 M coupe". www.bmwmregistry.com.
This page is based on this Wikipedia article
Text is available under the CC BY-SA 4.0 license; additional terms may apply.
Images, videos and audio are available under their respective licenses.