BMW M20 - bmw m. BMW M20 is a SOHC inline six-cylinder diesel engine, which was produced from 1977 to 1993. It was introduced eight years after a major BMW M ..



BMW M20 is a SOHC inline six-cylinder diesel engine, which was produced from 1977 to 1993. It was introduced eight years after a major BMW M30 inline six-cylinder engine, which remained in production alongside the M20.

The first cars to use the M20 was a series E12 5 series E21 3. The original model M20 had a displacement of 2.0 liters 122 CU in, with later versions having a displacement up to 2.7 l 165 do. E. V.

On the M20 began to fold after the introduction of the M50 engine in 1990. Final M20 engines were fitted to the E30 3 series wagon and convertible models created in April 1993.

On the M20 served as the basis for diesel engine BMW M21. It is also loosely related to the BMW engine M70 V12 gasoline engine.


1. History. (История)

In the 1970s, BMW felt the need for six-cylinder engine is smaller than BMW M30 to use it in the 3 series and 5 series. In the result, the M20 had a displacement of 2.0 liters 122 CU in BMWs smallest in-line six-cylinder engine. Later versions had a displacement up to 2.7 l CU and 165 M20 was used in a series E12 5 series 3 E21, E28 5 series, E30 3 series and E34 5-series.

Early versions of M20 and was sometimes referred to as "M60", while the code BMW M60 then used the V8 engine produced 1992-1996.


2. Design. (Дизайн)

As for the M30 on the M20 has a cast iron block, aluminum head and valve SOHC with 2 valves per cylinder. The main differences from the M30 are:

  • Tilt 20 degrees compared to 30 degrees on M30.
  • The timing belt and not timing chain.
  • Wells range from 91 mm 3.6 In, not 100 3.9 mm in.

3.1. Model. M20B20

The first models to use the M20 was 520 E12 / 6 and E21 320 / 6, which is used 1.991 CC, 121 CU in M20B20. This engine uses a bore of 80 mm 3.15 inches and the stroke is 66 mm 2.60. On the M20B20 initially used 4E1 Solex four-barrel carburetor, had a compression ratio of 9.2:1 and red 6.400 rpm.

On the M20B20 first became fuel injected in 1981, with Bosch K-Jetronic used. The compression ratio was raised to 9.9:1. In September 1982, with the release of the E30 3 series, fuel injection has been updated to LE-Jetronic with a red 6.200 rpm. Other updates included a larger port known as a "731" head of cylinder block, the lighter block and new manifolds. M60 designation was finally withdrawn and replaced by the M20.

In 1987, the M20B20 was again revised with the addition of Bosch Motronic engine management, catalyst and a compression ratio of 8.8:1.

On the M20B20 was not sold in North America.


  • 1981-1982 E28 520i K-Jetronic.
  • 1986-1987 520i E28 Motronic.
  • 1988-1990 E34 520i Motronic.
  • 1982-1984 sport E30 320i l-Jetronic.
  • 1976-1981 E12 520 / 6 carb.
  • 1982-1984 E28 520i l-Jetronic.
  • 1977-1982 E21 320 / 6 carb.
  • 1984-1987 520i E28 Le-Jetronic.
  • 1984-1987 E30 320i sport Le-Jetronic.
  • 1987-1992 E30 320i Motronic sports.


3.2. Model. M20B23

Six months after the M20 was launched with M20B20 carburetted, the more the injection M20B23 was introduced in March 1978. The initial version of the M20B23 uses the same head, known as "200" and the M20B20 block, but in 3.02 76.8 mm crank stroke. Bore 80 mm 3.15 inches. Fuel injection K-Jetronic, the compression ratio is 9.5:1 and Redline is 6.400 rpm.

Version 1982 Le-Jetronic on a 731 cylinder head, compression ratio 9.8:1, and other updates as M20B20, the result is a power output of 139 HP 104 kW.

In 1984, fuel injection, exhaust and shaft has been upgraded to the LE-Jetronic and the power increased to 112 kW 150 HP with a red 6.500 rpm.

On the M20B23 was not sold in North America.


  • 1982-1984 E30 323i l-Jetronic.
  • 1984-1987 E30 323i Le-Jetronic.
  • 1977-1982 E21 323i K-Jetronic.

3.3. Model. M20B25

In 1985 he replaced M20B23 M20B25. On the M20B25 has a capacity of 2.494 CC 152.2 CU and initially produced 126 kW 171 HP, 169 HP without catalyst. It has an upgraded cylinder head is known as "885", internal diameter 84 mm 3.31 in stroke 75 mm to 2.95 in compression ratio-9.4:1, red 6.500 rpm and uses a Bosch Motronic 1.1 engine management.

In 1987 he entered catalyzed model with Motronic 1.3 engine management. The compression ratio was lowered to 8.8:1, but thanks to more sophisticated electronics power remained nearly as before, for 125 kW 170 PS, 168 HP. the Engine is kept in non-enzymatic production in southern Europe and in other markets where unleaded fuel was not regularly available.


  • 1985-1993 E30 325i. (1985-1993 Е30 325 спортивный)
  • 1989-1990 E34 525i.
  • 1988-1991 Z1. (1988-1991 З1)

3.4. Model. M20B27

On M20B27 was designed for efficiency, thus, e is the Greek letter that in the 325e and low rpm torque. This unusual design strategy for the BMW inline six-cylinder engine, which is typically designed for power at high revs. Compared to M20B25 piston stroke increased from 75 to 81 mm 2.95 to 3.19 in, causing the power 2.693 CC 164.3 CU in. In accordance with the M20B25, bore 84 mm 3.31 in. To reduce friction and increase efficiency, M20B27 changes include the use of 200 version head which has smaller ports, different camshaft, four axles and softer valve springs. In this regard, the Rev limit on the M20B27 has been reduced to 4.800 rpm. Compression ratio 9.0:1 was used 528e in the us, and 11:1 to the Euro 525e and 325e cars fell to 10.3:1 in 1985. Initial engine M20B27 produces 92 kW 123 HP and 240 nm 177 lb⋅ft at 3.250 rpm for models without catalytic Converter. Models with catalytic Converter capacity of 90 kW 121 HP and 230 nm, 170 lb⋅ft.

Since many markets tax cars based on engine capacity of ETAs larger displacement means that it was not suitable for all markets. It was specifically designed with the American market in mind. BMWs corporate average fuel consumption was at risk of not meeting the requirements to 1984, primarily due to the increase in sales of their more expensive cars in the early 1980-ies. The first car to use the M20B27 was the US market 528e 1982.

In late 1987, fuel injection was upgraded to Motronic 1.3 on the American market plastic bumper 325e super ETA, the cylinder head changed to "885" version, the compression was lowered to 8.5:1 and the red is increased to 5.200 rpm. Power output increased to 95 kW 127 HP at 4.800 rpm.

In the early 1990-ies of BMW in South Africa used components from Alpina C3 2.7 to produce E30 specifically for the production of the Group Tin racing car N. The first version of the engine used in the E30 325iS produced 145 kW, 194 HP, and the second version, often called the "Evo2" or the identification number plate as "HP2" produced 155 kW 208 HP.


  • 1982-1988 E28 528e 525e is called in North America.
  • 1982-1987 E30 325e.
  • 1989-1992 E30 325iS only available in South Africa.

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