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The BMW M30 is a straight-6 SOHC petrol engine which was produced from 1968 to 1994. Over its 28-year lifespan, the M30 was used in many BMW models.

BMW M30
BMW E28 motor.jpg
Overview
Manufacturer BMW
Production 1968–1994
Combustion chamber
Configuration SOHC straight-6
Chronology
Predecessor BMW M337
Successor BMW M50

The first models to use the M30 engine were the E3 2500 and 2800 sedans. The initial M30 models were produced in displacements of 2.5-3.0 litres, with later versions having displacements of up to 3.4 litres.[1]

Initially, the engine code was "M06", before it was renamed the M30 in the mid 1980s.[citation needed] The engine has been given the nicknames of 'Big Six' and 'Senior Six', following the introduction of the smaller M20 straight-6 engine in the late 1970s.

Following the introduction of the DOHC M50 engine in 1990, the M30 began to be phased out.

Ward's have rated the M30 as one of the "Top Engines of the 20th Century".[2]

Contents

DevelopmentEdit

The M30 was originally developed in the late 1960s, loosely based on the straight-four BMW M10 engine first used in the 'Neue Klasse' BMW 1500.[3](p70) Several features, including a profile lowering 30-degree slant to the right, a crossflow head (a gas flow head in later designs) and a chain-driven single overhead cam with rocker arm valve actuation are common between the M10 and the M30.[4] Further similarities include a cast-iron block with an aluminium head and a forged crankshaft. The first two engines introduced were the 2.8 and the 2.5 litre option, both short-stroke engines sharing a common bore.[3]

M90Edit

The M90 engine, used in several models from 1979-1982, combines the block from the motorsports BMW M88 engine with the M30's SOHC cylinder head.

ModelsEdit

Engine Displacement Power Torque Bore Stroke Year
M30B25V 2,494 cc (152 cu in) 110 kW (150 bhp)
@ 6000 rpm
211 N·m (156 lb·ft)
@ 3700 rpm
86mm 71.6mm 1968
M30B25 110 kW (150 bhp)
@ 6000 rpm
215 N·m (159 lb·ft)
@ 3700 rpm
1981
M30B28V 2,788 cc (170 cu in) 125 kW (168 hp)
@ 6000 rpm
234 N·m (173 lb·ft)
@ 3700
86 mm 80 mm 1968
M30B28 135 kW (181 hp)
@ 5800 rpm
240 N·m (180 lb·ft)
@ 4200 rpm
1977
M30B30V 2,986 cc (182 cu in) 132 kW (177 hp)
@ 6000 rpm
255 N·m (188 lb·ft)
@ 3700 rpm
89mm 80mm 1971
M30B30 147 kW (197 hp)
@ 5500 rpm
272 N·m (201 lb·ft)
@ 4300 rpm
1971
M30B32 3,210 cc (196 cu in) 147 kW (197 hp)
@ 5500 rpm
285 N·m (210 lb·ft)
@ 4300
89mm 86mm 1976
M30B33V 3,295 cc (201 cu in) 139 kW (186 bhp)
@5500 rpm
289 N·m (213 lb·ft)
@ 3500 rpm
89mm 88mm 1973
M30B34
w/o cat
3,430 cc (209 cu in) 160 kW (210 bhp)
@ 5800 rpm
310 N·m (230 lb·ft)
@ 4200 rpm
92mm 86mm 1982
M30B34
w/ cat
136 kW (182 hp)
@ 5400 rpm
290 N·m (210 lb·ft)
@ 4000 rpm
1982
M30B35 155 kW (208 hp)
@ 5700 rpm
305 N·m (225 lb·ft)
@ 4000 rpm
1988

M30B25VEdit

 
M30 production in Munich
 
M30 production in Munich

The first model to use the 2494 cc version of the M30 was the E3 2500 in 1968. The compression ratio is 9.0:1. This version has also been known as the M06 and M68, prior to BMW renaming it the M30B25V (V for Vergasser- carburettor in German).[5]

Applications:

  • 1968–1977 E3 2500
  • 1974–1975 E9 2.5 CS
  • 1973–1976 E12 525 (107 kW)
  • 1976–1981 E12 525
  • 1977–1979 E23 725[6]

M30B25Edit

In 1981, Bosch L-Jetronic fuel-injection was added to the 2.5 litre variant.

Applications:

M30B28VEdit

Initially, the M30B28V used dual Solex Zenith 35/40 INAT carburettors and a compression ratio of 9.0:1. This engine produces 125 kW (168 bhp) and 235 N·m (173 lb·ft).[3](p77) This version has also been known as the M06 and M68, prior to BMW renaming it the M30B28V.

Applications:

  • 1968-1974 E3 2800[10]
  • 1968-1971 E9 2800 CS
  • 1971 E3 Bavaria (United States only)
  • 1974-1976 E12 528 (121 kW)[11][12]
  • 1975–1977 E3 2.8 L
  • 1976-1978 E12 528
  • 1977-1979 E23 728

M30B28Edit

In 1977, Bosch L-Jetronic fuel-injections was added to the 2.8 litre variant.[10]

  • 1977-1978 E12 528i (North America only, 129 kW, lower compression ratio)
  • 1978-1981 E12 528i
  • 1979-1986 E23 728i
  • 1979-1987 E24 628CSi
  • 1981-1987 E28 528i[13]

M30B30VEdit

This engine produces 132 kW (177 bhp) and 255 N·m (188 lb·ft)[14][15] and has a compression ratio of 9.0:1.

Applications:

  • 1971-1975 E9 3.0 CS
  • 1971-1972 E9 3.0 CSL
  • 1971-1974 E3 3.0 S / 3.0 L / Bavaria
  • 1976-1979 E24 630 CS (136 kW, Pierburg 4A1 carburetor)[10][16]
  • 1977-1979 E23 730 (135 kW)[17]

M30B30Edit

The fuel-injected version of the 3.0 litre M30 debuted in 1971 in the E9 3.0 CSi, which uses the Bosch D-Jetronic fuel injection system.[18] This engine produces 147 kW (197 bhp) and 272 N·m (201 lb·ft).[19][20] The compression ratio is 9.5:1.

Applications:

  • 1971-1975 E9 3.0 CSi
  • 1972-1973 E9 3.0 CSL
  • 1972-1975 E3 3.0Si
  • 1975–1978 E12 530 (130 kW, South Africa only)[citation needed]
  • 1975–1978 E12 530i (131 kW, North America only)[21]
  • 1976 E12 530 MLE (147 kW, South Africa only)[22]
  • 1977–1978 E24 630CSi (129 kW, North America only)[23]
  • 1986–1992 E32 730i (138 kW)
  • 1988–1990 E34 530i

M30B32Edit

Despite having a capacity of 3210 cc, this engine appeared in many cars badged so as to suggest 3.3 litres of displacement- such as the 633i, 3.3 Li, and 733i. The compression ratio is 8.8:1. In the E24 633CSi, it uses Bosch L-Jetronic fuel injection.[10] The US version used L-Jetronic from 1978 until mid-1981, changing over to Motronic fuel injection in June of that year. The 1979 732i is BMW's first use of Bosch's Motronic fuel injection.[24]

Applications:

  • 1973-1975 E9 3.0 CSL (151 kW, 3,153 cc)
  • 1976–1984 E24 633CSi (145-147 kW in Euro spec, 128-130 kW in USA spec)
  • 1976-1979 E3 3.3 Li (147 kW)[25]
  • 1977-1984 E23 733i (147 kW in Euro spec,[26] 130-145 kW in USA spec)
  • 1979-1981 E12 533i (North America only, 135 kW)[27]
  • 1979–1986 E23 732i (144 kW)
  • 1982–1984 E28 533i (North America only, 135 kW/181hp)
  • 1984–1986 E30 333i (South Africa only, 145 kW)

M30B33VEdit

The carburetted M30B33 produces 139 kW (186 bhp) and 289 N·m (213 lb·ft).[28]

Applications:

M30B34Edit

Without catalytic converter

The version sold in Europe and most other markets used a 10.0:1 compression ratio and produced 160 kW (210 hp).[30] In the E24 635CSi, it uses Bosch Motronic 1.0 fuel injection.[10]

Applications:

With catalytic converter

The version sold in markets such as North America and Japan used an 8.0:1 compression ratio and produced 136 kW (182 hp).[31]

Applications:

  • 1982–1987 E24 635CSi
  • 1982-1987 E23 735i
  • 1985-1988 E28 535i / 535is
  • 1985-1987 E23 L7
  • 1987 E24 L6

M30B35Edit

 
M30B35

This engine has a capacity of 3.4 litres, despite the "B35" model code. It produces 155 kW (208 bhp) and 305 N·m (225 lb·ft), and has a compression ratio of 9.0:1. In the E24 635CSi, it uses Bosch Motronic 1.3 fuel injection.[10]

Applications:

TurbochargingEdit

The M30 was the basis for the turbocharged M102 and M106 engines.

The Alpina B10 Biturbo used a modified version of the M30, with two turbochargers and forged pistons. Producing 265 kW/360 hp at 6000 rpm and 520Nm/384 lb-ft at 4000 rpm, the engine made this car the fastest sedan in the world. The final 50 M30 blocks were shipped to Alpina for use in the final 50 B10 Biturbos.[33]

MotorsportEdit

 
E24 635 CSi Group A

The M30 powered a series of E9 and E24 coupes to European Touring Car Championship (ETCC) throughout the 1970s and into the middle 1980s, even though a more powerful DOHC 24-valve head had been developed for high-performance motorsports and street use.

The M88 high-performance engine is based on the M30 block.[34]

See alsoEdit

  • BMW M10, the inline-4 engine that the M30 was based on.
  • BMW M20, the smaller straight-6 which was sold alongside the M30 for many years.
  • BMW M88, the high-performance straight-6 engine that was sold alongside the M30 from 1978 to 1989.
  • BMW S38, the successor to the M88, which was sold alongside the M30 from 1986 to 1995.

ReferencesEdit

  1. ^ "Bmw Engine and Powerplant Identification Codes". www.rtsauto.com. Retrieved 8 September 2017. 
  2. ^ "Ward’s 10 Best Engines include 2 BMW sixes". www.pacemotors.com.au. Archived from the original on 22 May 2007. 
  3. ^ a b c Becker, Clauspeter (1971), Logoz, Arthur, ed., "BMW 2500/2800", Auto-Universum 1971 (in German), Zürich, Switzerland: Verlag Internationale Automobil-Parade AG, XIV 
  4. ^ Cranswick, Marc (2010). The BMW 5 series and X5: a history of production cars and tuner specials, 1972-2008. Jefferson, NC: McFarland. ISBN 0786443510. 
  5. ^ "Easter Special: History of BMW motorsport, inc the factory 959BHP M30". www.bimmernut.com. Archived from the original on 26 November 2012. 
  6. ^ "BMW 7 Series (E23) 1977 - 1986". www.autoevolution.com. Retrieved 1 September 2017. 
  7. ^ "1981 BMW E28 525i Technical Specifications". www.ultimatespecs.com. Retrieved 1 September 2017. 
  8. ^ "1981 bmw E23 725i Technical Specifications". www.ultimatespecs.com. Retrieved 1 September 2017. 
  9. ^ "1986 BMW 725i (model up to mid-year 1986 for Europe ) specifications". www.automobile-catalog.com. Retrieved 1 September 2017. 
  10. ^ a b c d e f Oswald, Werner (2001). Deutsche Autos 1945-1990, Band 4 (1 ed.). Stuttgart: Motorbuch Verlag. ISBN 3-613-02131-5. 
  11. ^ "1974 BMW E12 5 Series 528 Technical Specifications". www.ultimatespecs.com. Retrieved 1 September 2017. 
  12. ^ "1974 BMW 528 (model since mid-year 1974 for Europe Australia ) specifications". www.automobile-catalog.com. Retrieved 1 September 2017. 
  13. ^ "1981 BMW 528i E28". www.carfolio.com. 
  14. ^ "1971 BMW 3.0 S (model since April 1971 for Europe Australia ) specifications". www.automobile-catalog.com. Retrieved 1 September 2017. 
  15. ^ "1971 BMW E9 3.0 CS Technical Specifications". www.ultimatespecs.com. Retrieved 1 September 2017. 
  16. ^ "1976 BMW 630 CS E24". www.carfolio.com. Retrieved 1 September 2017. 
  17. ^ "BMW 730, 1977 MY E23". www.carfolio.com. Retrieved 1 September 2017. 
  18. ^ "The BMW Six Cylinder Guide". www.autospeed.com. Retrieved 8 September 2017. 
  19. ^ "1972 BMW 3.0 CSi E9". www.carfolio.com. Retrieved 1 September 2017. 
  20. ^ "1972 BMW E9 3.0 CSi Specs". www.ultimatespecs.com. Retrieved 1 September 2017. 
  21. ^ "1974 BMW E12 5 Series 530i(USA) Specs". www.ultimatespecs.com. Retrieved 1 September 2017. 
  22. ^ "1976 BMW 530 MLE E12". www.carfolio.com. Retrieved 1 September 2017. 
  23. ^ "1976 BMW 630 CSi E24". www.carfolio.com. Retrieved 1 September 2017. 
  24. ^ "BMW M30 and M102 Six Cylinder Engines". www.unixnerd.demon.co.uk. Retrieved 1 September 2017. 
  25. ^ "1977 BMW 3.3 Li (model up to mid-year 1977 for Europe ) specifications". www.automobile-catalog.com. Retrieved 1 September 2017. 
  26. ^ "BMW 733i, 1977 MY E23". www.carfolio.com. Retrieved 1 September 2017. 
  27. ^ "1984 BMW 533i (model since mid-year 1983 for North America U.S.) specifications". www.automobile-catalog.com. Retrieved 1 September 2017. 
  28. ^ "1973 BMW 3.3L E3 specifications". www.carfolio.com. Retrieved 1 September 2017. 
  29. ^ "E3 3.3L model selection". www.realoem.com. Retrieved 1 September 2017. 
  30. ^ "1985 BMW E28 5 Series M535i Specs". www.ultimatespecs.com. 
  31. ^ "1985 BMW E28 5 Series M535i Kat Specs". www.ultimatespecs.com. 
  32. ^ Büschi, Hans-Ulrich, ed. (March 9, 1989). Automobil Revue 1989 (in German and French). 84. Berne, Switzerland: Hallwag AG. p. 498. ISBN 3-444-00482-6. 
  33. ^ Palevsky, Alexander. "Blown Away". Bimmer Magazine (October 2007): 62. 
  34. ^ "FAQ E23 745i SA (M88)". www.bmwmregistry.com. Retrieved 1 September 2017.