BMW M50 - bmw m. BMW M50 straight-6 DOHC petrol engine, which was produced from 1990 to 1996. It was released in E34 520i and 525i to replace the motor M20. ..



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

In September 1992, the M50 was upgraded to the M50TU, "technical update," which was BMWs first engine with variable valve timing. Called single VANOS on BMW, the system is adjusted the phase of the intake camshaft.

M50 began to fold after the introduction of the M52 engine in 1994.

The E36 m3 was powered by the S50 engine series, which is a high-performance version of the M50.


1. Design. (Дизайн)

A significant step forward compared to the M20 predecessor, the M50 features two overhead camshafts DOHC with four valves per cylinder M20 has a single overhead camshaft with 2 valves per cylinder, coil-on-plug ignition, knock sensor and lightweight plastic intake manifold. Both engines use a cast iron block with aluminum alloy head. In Redline is 6.500 rpm only for models C50, the same as the final version of the M20.

The location of the oil pan varies depending on the model M50 is established. It is in front of the E34 5 series as the M20, and in the rear for 3 series E36.


2.1. Model. M50B20

In 1.991 CC, 121.5 CU in M50B20 was introduced with the 1990 520i. It has a diameter of 80 mm 3.15 in stroke 66 mm 2.60 and produces 110 kW 148 HP. The compression ratio is 10.5:1.


  • 1990-1992 E34 520i.
  • 1991-1992 E36 320i sports.

2.2. Model. M50B20TU

On was updated M50B20 single VANOS in 1992. Maximum torque was available at 4.200 rpm. It produces 110 kW 148 HP at 5.900 rpm, 190 N * M 140 lb⋅ft at 4.200 rpm. The compression ratio was increased to 11.0:1.


  • 1992-1994 E36 320i sports.
  • 1992-1996 E34 520i.

2.3. Model. M50B24TU

This 2.394 146.1 of the criminal code in the engine is used in Thailand and Oceania markets. It is based on 2.494 CC 2.5 l M50B25TU with speed reduced to 72 mm 2.83 In and produces 138 kW, 185 HP at 5.900 rpm and 240 nm 177 lb⋅ft at 4.200 rpm. The compression ratio was 10.5:1.


  • 1993-1995 E36 325iA / 2.4.
  • 1992-1996 E34 525iA / 2.4.

2.4. Model. M50B25

In 2.494 CC 152.2 CU in M50B25 was introduced with the 1990 525i and 525ix. It has a diameter of 84 mm 3.31 in stroke 75 mm 2.95 In and produces 141 kW 189 HP at 6.000 rpm and 245 N ∙ m 181 lbf⋅ft at 4.700 rpm. Compression ratio is 10.0:1.


  • 1991-1992 E36 325i, 325is.
  • 1990-1992 E34 525i, 525ix.

2.5. Model. M50B25TU

On the M50B25 was updated with single VANOS in 1992, resulting in the maximum torque becomes available at 4.200 rpm. It produces 141 kW 189 HP at 5.900 rpm and 250 N * m 184 lb⋅ft at 4.200 rpm. The compression ratio was increased to 10.5:1.


  • 1993-1995 E36 325i, 325is.
  • 1992-1996 E34 525i, 525ix.

3. S50

On the S50 is a high-performance version of the M50 which was used in E36 m3, replacing the four-cylinder BMW engine S14 used in the E30 m3. As for the M50, S50-for has a cast iron block and aluminum head with four valves per cylinder.

In the United States, less powerful engine is called "S50B30US", which shares more in common with a conventional engine M50, S50 than the other version.


3.1. S50 S50B30

On the S50B30 was used in most countries except the USA in 1993, BMW Canada officially imported 45 m3 with the S50B30 engine. On the S50B30 produces 210 kW 282 HP, has a diameter of 86 mm 3.39 in stroke 85.8 mm 3.38 and a compression ratio of 10.8:1. Red line is 7200 rpm. S50 has individual throttle body for each cylinder, one-Vanos variable camshaft phasing on the intake camshaft, Bosch Motronic m3.3 motor control and redesigned intake and exhaust system.

The limited edition "m3 GT" model from 1995 had produced 220 kW 295 HP. It had different camshafts and a redesigned sump and oil pump.


  • 1992-1995 E36 m3 except us.

3.2. S50 S50B30US

In the United States, 1994-1995 issue in the E36 m3 S50B30US on the basis of cubic 2.990 182.5 CU in engine that produces 240 HP 179 kW. This engine is more closely related to the standard M50 engine and has the same compression ratio as M50B25TU, but uses a different crankshaft, rods and pistons. Diameter 86 mm 3.39 in stroke 85.8 mm 3.38 and Redline at 7000 rpm.

In 1996, the S50B30US was replaced by the BMW engine S52 in the US and Canada.


  • 1994-1995 E36 m3 us only.

3.3. S50 S50B32

In 1996 S50B32 replaced the S50B30, with the exception of Canada and the United States, where engine BMW S52 was used instead. Power output increased to 239 kW 321 HP. and the volume increased to 3.2 l, 195.3 CU in 3.201 CC, due to the increased stroke of 91 mm 3.58 and a slight increase in bore to 86.4 mm in 3.40.

On S50B32 double Vanos is the variable valve timing on both camshafts and a secondary oil pickup has been added. Compression ratio-11.3:1 and Redline is 7.600 rpm. Motor control from Siemens MSS50, with 3 knock sensors.


  • 1996-2000 Z3 m coupe and M Roadster, with the exception of Canada and the United States.
  • 1996-1999 E36 M3, with the exception of Canada and the United States.

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