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CATEGORIES (articles) > Engine, Gearbox > BMW > BMW M50 Engine overview

BMW M50 Engine overview


BMW M50 engine
Manufacturer: BMW
Production: 1989–1994
Predecessor: BMW M20
Successor: BMW M52
Class: Straight-6
Similar: Mercedes-Benz M103

The BMW M50 is an I6 piston engine. It was introduced in 1989 to replace the BMW M20 and was replaced by the BMW M52 in 1994. Displacement ranges from 2.0 L to 3.0 L. It is a DOHC 24-valve engine. A Technical Update or M50TU version from 1992 introduced VANOS variable valve timing.

The M50 was related to the M20 with the same 91 mm cylinder spacing, bore, and stroke at 2.0 L and 2.5 L.

Models
Engine Displacement Power Torque Redline Year
M50B20 2.0 L (1991 cc/121 in³) 110 kW (148 hp) @ 5900 190 N·m (140 ft·lbf) @ 4700 6500 1989
M50B24 2.4 L 110 kW (148 hp) @ 5900
M50B25 2.5 L (2494 cc/152 in³) 141 kW (189 hp) @ 5900 245 N·m (181 ft·lbf) @ 4700 6500 1989
141 kW (189 hp) @ 5900 250 N·m (184 ft·lbf) @ 4200 6500 1992
141 kW (189 hp) @ 5900 245 N·m (181 ft·lbf) @ 4200 6500 1992

M50B20

The 2.0 L (1991 cc) M50B20 was introduced with the 1989 520i. It has an 80 mm bore and 66 mm stroke and produces 150 hp (110 kW).

Applications:

  • 1991-1995 E36 320i
  • 1991-1995 E34 520i

M50B24

This is a 2.4 L engine based on the 2.5 L M50B25, with a reduced stroke. This engine is only fitted to CKD kits assembled in Thailand. Power output is 188 hp (140 kW) and torque is 177 ft.lbf (240 Nm).

Applications:

  • 1993-1997 E36 3-Series (Thai specification)
  • 1993-1997 E34 5-Series (Thai specification)

M50B25

The 2.5 L (2494 cc) M50B25 was introduced with the 1992 525i. It has an 84 mm bore and 75 mm stroke and produces 192 hp (141 kW).

Applications:

  • 1991-1995 E36 325i
  • 1992-1995 E34 525i/525ix

Note: This is the engine from which the M50TU evolved. The VANOS update was added late 1992 and sold for 1993 model year E34s.

S50B30US

The S50B30US was a 3.0 L version, which powered the US-spec E36 M3. Power was 240 hp (179 kW).

Applications:

  • 1995 E36 M3

S50B30

The S50B30 was a special sports-oriented 3.0 L version, which powered the RoW spec E36 M3. Power is 286 hp (210 kW). The S50B30 has a bore of 86mm and a stroke of 85.8mm, with a total displacement of 2990cc.

Applications:

  • 1992-1995 E36 M3

S50B32

The S50B32 was an evolution version of the S50B30. Power of the 3.2 L version is 321hp. This engine has a bore of 86.4mm and a stroke of 91.0mm giving a displacement of 3201cc.

Applications:

  • 1996-1999 E36 M3
  • 1997-2000 M Roadster
  • 1998-2000 M Coupe




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