|Successor||BMW M60 V8
The BMW M30 (early models are sometimes referred to as "M06") is a straight-6 SOHC piston engine which was used over a 28-year lifespan over many BMW models. Ward's have rated the M30 as one of the "Top Engines of the 20th Century".
It has been given the nicknames of 'Big Six' and 'Senior Six', following the introduction of the smaller BMW M20 straight-six in the late 1970s.
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. Several features, including a 30-degree cam to the right for a lower profile, a crossflow head and a gas flow head in later models design, and a chain-driven single overhead cam with rocker arm valve actuation, are common between the M10 and the M30. 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.
|This article needs additional citations for verification. (June 2012)|
|2500 version||2494 cc||110 kW (147 hp) @ 6000||211 N·m (156 lb·ft) @ 3700||9.0||1968|
|2800 version||2788 cc||125 kW (168 hp) @ 6000||234 N·m (173 lb·ft) @ 3700||9.0||1968|
|3.0CS version||2986 cc||132 kW (177 hp) @ 6000||255 N·m (188 lb·ft) @ 3700||9.0||1971|
|3.0CSi version||2986 cc||147 kW (197 hp) @ 5500||272 N·m (201 lb·ft) @ 4300||9.5||1971|
|M30B25||2494 cc||110 kW (147 hp) @ 6000||211 N·m (156 lb·ft) @ 3700||9.0||1973|
|2788 cc||125 kW (168 hp) @ 5800||233 N·m (172 lb·ft) @ 4000||9.3||1975|
|2788 cc||135 kW (181 hp) @ 5800||240 N·m (180 lb·ft) @ 4200||6500||9.3||1978|
|M30B30||2986 cc||130-140 kW||1975|
|M30B32||3210 cc||145 kW (194 hp) @ 5500||285 N·m (210 lb·ft) @ 4300||1976|
|3428 cc||136 kW @ (182 hp) 5400||290 N·m (210 lb·ft) @ 4000||6200||8.0||1985|
|3428 cc||163 kW @ (218 hp) 5800||310 N·m (230 lb·ft) @ 4200||10.0||1985|
|M30B35||3428 cc||155 kW (207 hp) @ 5700||305 N·m (225 lb·ft) @ 4000||6200||9.0||1988|
The first model to use the 2494 cc version of the M30 was the E3 2500 in 1968. This, called the M30B25, is the smallest of the M30 engines. Unless otherwise noted, these engines use a carburetor.
- 1968-1972 E3 2500
- 1974-1975 E9 2.5 CS
- 1973–1976 E12 525 (107 kW)
- 1975-1979 E23 725 (110 kW)
- 1976–1981 E12 525 (110 kW)
- 1981–1987 E28 525i (110 kW, fuel injected)
A 2.8 litre version of the M30, this appeared in 1968 in the then new E3 2800 and E9 2800CS. It has a bore of 86 mm, a stroke of 80 mm and a displacement of 2,788 cc (170.1 cu in). In the E24 628 CSi, it uses Bosch L-Jetronic fuel injection. Originally, two Solex Zenith "35/40 INAT" carburetors are used, the compression ratio is 9.0:1 and the engine produces 170 PS (125 kW) and 24.0 kg·m (235 N·m; 174 lb·ft).
- 1968-1971 E3 2800
- 1971 E3 Bavaria
- 1968-1971 E9 2800CS
- 1975-1976 E12 528 (125 kW, carburetor)
- 1977-1979 E23 728 (125 kW, carburetor)
- 1976-1978 E12 528 (130 kW, carburetor)
- 1977-1978 E12 528i (129 kW, fuel injected, lower compression ratio, North America only)
- 1978-1981 E12 528i (135 kW, fuel injected)
- 1979-1986 E23 728i (135 kW, fuel injected)
- 1979–1987 E24 628CSi (135 kW, fuel injected)
- 1981-1987 E28 528i (135 kW, fuel injected)
This version was produced from 1971 until 1992. It has a bore of 89 mm, a stroke of 80 mm and a displacement of 2986 cc. The first model to use the carburetted version of the 3 litre M30 was the E9 3.0CS. There was also the first fuel-injected M30 version for the CSi and later Si models.
- 1971-1975 E9 3.0CS
- 1972-1974 E3 3.0S
- 1972-1974 E3 Bavaria
- 1976–1979 E24 630CS (Pierburg 4A1 downdraft carburetor)
- 1977-1979 E23 730 (135 kW)
- Fuel injected
- 1971-1975 E9 3.0CSi
- 1972-1973 E9 3.0CSL
- 1974-1975 E3 3.0Si
- 1975–1978 E12 530 (130 kW, South Africa only)
- 1975–1978 E12 530i (131 kW, North America only)
- 1976 E12 530 MLE (147 kW, South Africa only)
- 1977–1978 E24 630CSi (North America only)
- 1986–1992 E32 730i (138 kW)
- 1988–1990 E34 530i (not sold in North America)
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. It has a bore of 89 mm, a stroke of 86 mm and a capacity of 3210 cc. In the E24 633CSi, it uses Bosch L-Jetronic fuel injection. The US version used L-Jetronic from 1978 until mid-1981, changing over to Motronic fuel injection in June of that year.
- 1976–1984 E24 633CSi
- 1976-1977 E3 3.3 Li
- 1977-1979 E23 733i (145 kW)
- 1979 E12 533i
- 1979–1986 E23 732i (144 kW)
- 1983–1984 E28 533i (North America only)
- 1984-1986 E30 333i (145 kW, South Africa only)
With catalytic converter: 8.0:1 compression ratio, 185 brake horsepower (138 kW) - mostly North America and Japan
- 1982–1987 E24 635CSi
- 1982-1987 E23 735i (160 kW)
- 1985-1988 E28 535i (136 kW, North America only)
- 1985-1987 E23 735i (136 kW, North American and Japan only)
- 1986-1987 E23 L7 (136 kW, North American and Japan only)
- 1987 E24 L6 (North America only)
- 1987-1988 E28 535is (136 kW, North America only)
Without catalytic converter: 10.0:1 compression ratio, 218 metric horsepower (160 kW) - Europe and rest of the world
Note: The following models use a variant of the M30 coined the M90. This engine is actually 3453cc and uses the same block as the BMW M88/S38 . It does, however, use a SOHC head and was regarded as the test horse platform before the production of the M88/S38 in order to determine if the "oversquare" engine setup would work reliably. The differentiation of this engine is coolant water passages on the side of the block (not otherwise seen on an M30B32/B34), and/or a white L stamped on the oil filter side of the block. It used both L-jetronic and Motronic injection systems, depending on the year.
Without catalytic converter: 9.3:1 compression ratio, 218 metric horsepower (160 kW) - Europe and rest of the world
- 9.0:1 compression ratio
- 211 metric horsepower (155 kW) at 5,700 rpm
- 225 lb·ft (305 N·m) torque at 4,000 rpm
- 87 AKI / 91 RON octane fuel or better recommended
- 1988–1989 E24 635CSi
- 1988–1992 E32 735i (155 kW)
- 1988–1993 E34 535i
- 1988-19?? Rayton Fissore Magnum 3.5
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.
The M30 powered a series of BMW 6-cylinder E9 and BMW 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.
- BMW M10, the straight-4 engine that the M30 was based on.
- BMW M20, the smaller straight-6 which was sold alongside the M30 for many years.
- Becker, Clauspeter (1971), Logoz, Arthur, ed., "BMW 2500/2800", Auto-Universum 1971 (in German) (Zürich, Switzerland: Verlag Internationale Automobil-Parade AG) XIV: 70
- Cranswick, Marc (2010). The BMW 5 series and X5: a history of production cars and tuner specials, 1972-2008. Jefferson, NC: McFarland. ISBN 0786443510.
- Oswald, Werner (2001). Deutsche Autos 1945-1990, Band 4 (1. ed.). Stuttgart: Motorbuch Verlag. ISBN 3-613-02131-5.
- Becker, p. 77
- 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.
- Palevsky, Alexander. "Blown Away". Bimmer Magazine (October 2007): 62.
|Wikimedia Commons has media related to BMW M30 engine.|
- Bmw Engine and Powerplant Identification Codes with official BMW Document
- BMW Engines - Straight6_m
- BMW E Numbers List
- The UnixNerd's BMW M30 engine page with photos, history and common problems.
|« previous — BMW road car engine timeline, 1950s-1970s — next »|
|4-cylinder petrol||M10 >>|
|<< M78*||M30 >>|
|M88 / M90 >>|
|8-cylinder petrol||OHV V8|
|*made in East Germany as EMW|