Difference between revisions of "M5x"

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The [[BMW]] '''M5x''' range of engines are a line of  6-cylinder engines, fitted to BMW models between 1991 and 2001. The range is comprised of two main units; the [[M5x#M50|M50]] and the [[M5x#M52|M52]]. All M5x engines are fundamentally based on the [[M20]] engine that powered the E30 [[320i]], [[323i]] and [[325i]], and are therefore very popular engine swaps.
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The [[BMW]] '''M5x''' range of engines are a line of  6-cylinder engines, fitted to BMW models between 1991 and 2001. The range is comprised of three main units; the [[M5x#M50|M50]], [[M5x#M50TU|M50TU]] and the [[M5x#M52|M52]]. All M5x engines are fundamentally based on the [[M20]] engine that powered the E30 [[320i]], [[323i]] and [[325i]], and are therefore very popular engine swaps.
 
 
__TOC__
 
__TOC__
  
−
=M50=
+
=Versions=
 +
 
 +
==M50==
 +
 
 +
The M50 engine first saw action under the bonnet of the [[E34]] ad [[E36]] as the humble 2.0 variant before being enlarged to 2.5 in 1993. Being little more than an M20 engine with a 24V [[M5x#Head|head]], these engines are great upgrades for those who have tired of the M20 donk. Considering there is no difference when installing, there is little or no point fitting the weaker 2.0 version of the M50.
 +
 
 +
{| class=wikitable
 +
!Engine
 +
!Displacement
 +
!Power
 +
!Torque
 +
!Redline
 +
!Bore
 +
!Stroke
 +
!Year
 +
|-
 +
|M50B20
 +
|2.0 L (1990 cc/121 in³)
 +
|110 kW (150 hp) @ 6000
 +
|190 N·m (140 ft·lbf) @ 4700
 +
|6750
 +
|80mm
 +
|66mm
 +
|1991
 +
|-
 +
|M50B25
 +
|2.5 L (2494 cc/152 in³)
 +
|141 kW (192 hp) @ 6000
 +
|245 N·m (181 ft·lbf) @ 4700
 +
|6500
 +
|84mm
 +
|75mm
 +
|1991
 +
|-
 +
|}
 +
 
 +
==M50TU==
  
−
=M50TU=
+
After letting the [[M5x#M50|M50]] prove itself, BMW released a Technical Update for the engine in 1993, announcing the new engine as the '''M50TU'''. These units featured an even more complex head design incorporating [[M5x#VANOS|VANOS]] technology; a variable-valve timing system that modifies the position of the intake [[M5x#Cam|camshaft]]. This has no effect on the overall power of the engine, but does improve torque at lower revs.
  
−
=M52=
+
Because of this increased complexity, VANOS engines are best avoided for first-time engine swappers.
  
−
=Versions=
+
{| class=wikitable
 +
!Engine
 +
!Displacement
 +
!Power
 +
!Torque
 +
!Redline
 +
!Bore
 +
!Stroke
 +
!Year
 +
|-
 +
|M50TUB20
 +
|2.0 L (1990 cc/121 in³)
 +
|110 kW (150 hp) @ 5900
 +
|190 N·m (140 ft·lbf) @ 4700
 +
|6750
 +
|80mm
 +
|66mm
 +
|1993
 +
|-
 +
|M50TUB25
 +
|2.5 L (2494 cc/152 in³)
 +
|141 kW (192 hp) @ 5900
 +
|250 N·m (184 ft·lbf) @ 4200
 +
|6500
 +
|84mm
 +
|75mm
 +
|1993
 +
|-
 +
|}
 +
 
 +
==M52==
 +
 
 +
The M52 brought two new things to the BMW range of engines. Dual-VANOS, and Nikasil.
  
 
{| class=wikitable
 
{| class=wikitable
−
|+'''Models'''
+
!Engine
 +
!Displacement
 +
!Power
 +
!Torque
 +
!Redline
 +
!Bore
 +
!Stroke
 +
!Year
 
|-
 
|-
−
!Engine!!Displacement!!Power!!Torque!!Redline!!Year
+
|M52B20
 +
|2.0 L (1990 cc/121 in³)
 +
|110 kW (148 hp) @ 5900
 +
|190 N·m (140 ft·lbf) @ 4700
 +
|6500
 +
|80mm
 +
|66mm
 +
|1994
 
|-
 
|-
−
|rowspan=2|M40B16||rowspan=2|1.6 L (1596 cc/97 in³)||75 kW (101 hp) @ 5500||143 N·m (105 ft·lbf) @ 4250||6200||1988
+
|M52B25
 +
|2.5 L (2494 cc/152 in³)
 +
|123 kW (170 hp) @ 5500
 +
|245 N·m (181 ft·lbf) @ 3950
 +
|6500
 +
|84mm
 +
|75mm
 +
|1995
 
|-
 
|-
−
|73 kW (98 hp) @ 5500||141 N·m (104 ft·lbf) @ 4250|| 6200||1988
+
|M52B28
 +
|2.8 L (2793 cc/170 in³)
 +
|142 kW (193 hp) @ 5300
 +
|280 N·m (207 ft·lbf) @ 3950
 +
|6500
 +
|84mm
 +
|84mm
 +
|1995
 
|-
 
|-
−
|rowspan=2|M40B18||rowspan=2|1.8 L (1796 cc/109 in³)||85 kW (114 hp) @ 5500||165 N·m (122 ft·lbf) @ 4250||6200||1987
+
|}
 +
 
 +
==M52TU==
 +
 
 +
==S50==
 +
 
 +
{| class=wikitable
 +
!Engine
 +
!Displacement
 +
!Power
 +
!Torque
 +
!Redline
 +
!Bore
 +
!Stroke
 +
!Year
 +
|-
 +
|S50B30
 +
|3.0 L (2990 cc/182 in³)
 +
|210 kW (286 hp) @ 7000
 +
|320 N·m (235 ft·lbf) @ 3600
 +
|7280
 +
|86mm
 +
|85.8mm
 +
|1992
 +
|-
 +
|S50B32
 +
|3.2 L (3201 cc/195 in³)
 +
|236 kW (321 hp) @ 7400
 +
|350 N·m (257 ft·lbf) @ 3250
 +
|7600
 +
|86.4mm
 +
|91mm
 +
|1995
 
|-
 
|-
−
|83 kW (111 hp) @ 5500||162 N·m (119 ft·lbf) @ 4250||6200||1987
 
 
|}
 
|}
 +
 +
==S52==
 +
  
 
=Components=
 
=Components=
Line 50: Line 179:
 
==Head==
 
==Head==
  
 +
==VANOS==
  
 
===Rocker Cover===
 
===Rocker Cover===

Revision as of 22:07, 16 November 2011

The BMW M5x range of engines are a line of 6-cylinder engines, fitted to BMW models between 1991 and 2001. The range is comprised of two main units; the M50 and the M52. All M5x engines are fundamentally based on the M20 engine that powered the E30 320i, 323i and 325i, and are therefore very popular engine swaps.

Versions

M50

The M50 engine first saw action under the bonnet of the E34 ad E36 as the humble 2.0 variant before being enlarged to 2.5 in 1993. Being little more than an M20 engine with a 24V head, these engines are great upgrades for those who have tired of the M20 donk. Considering there is no difference when installing, there is little or no point fitting the weaker 2.0 version of the M50.

Engine Displacement Power Torque Redline Bore Stroke Year
M50B20 2.0 L (1990 cc/121 in³) 110 kW (150 hp) @ 6000 190 N·m (140 ft·lbf) @ 4700 6750 80mm 66mm 1991
M50B25 2.5 L (2494 cc/152 in³) 141 kW (192 hp) @ 6000 245 N·m (181 ft·lbf) @ 4700 6500 84mm 75mm 1991

M50TU

After letting the M50 prove itself, BMW released a Technical Update for the engine in 1993, announcing the new engine as the M50TU. These units featured an even more complex head design incorporating VANOS technology; a variable-valve timing system that modifies the position of the intake camshaft. This has no effect on the overall power of the engine, but does improve torque at lower revs.

Because of this increased complexity, VANOS engines are best avoided for first-time engine swappers.

Engine Displacement Power Torque Redline Bore Stroke Year
M50TUB20 2.0 L (1990 cc/121 in³) 110 kW (150 hp) @ 5900 190 N·m (140 ft·lbf) @ 4700 6750 80mm 66mm 1993
M50TUB25 2.5 L (2494 cc/152 in³) 141 kW (192 hp) @ 5900 250 N·m (184 ft·lbf) @ 4200 6500 84mm 75mm 1993

M52

The M52 brought two new things to the BMW range of engines. Dual-VANOS, and Nikasil.

Engine Displacement Power Torque Redline Bore Stroke Year
M52B20 2.0 L (1990 cc/121 in³) 110 kW (148 hp) @ 5900 190 N·m (140 ft·lbf) @ 4700 6500 80mm 66mm 1994
M52B25 2.5 L (2494 cc/152 in³) 123 kW (170 hp) @ 5500 245 N·m (181 ft·lbf) @ 3950 6500 84mm 75mm 1995
M52B28 2.8 L (2793 cc/170 in³) 142 kW (193 hp) @ 5300 280 N·m (207 ft·lbf) @ 3950 6500 84mm 84mm 1995

M52TU

S50

Engine Displacement Power Torque Redline Bore Stroke Year
S50B30 3.0 L (2990 cc/182 in³) 210 kW (286 hp) @ 7000 320 N·m (235 ft·lbf) @ 3600 7280 86mm 85.8mm 1992
S50B32 3.2 L (3201 cc/195 in³) 236 kW (321 hp) @ 7400 350 N·m (257 ft·lbf) @ 3250 7600 86.4mm 91mm 1995

S52

Components

Sump

Oil Pump

Sump Gasket

Block

Crankshaft

Piston Rods

Piston Head

Piston Rings

Crank Pulley

Head

VANOS

Rocker Cover

Despite the three styles of Head, the rocker cover is interchangeable across all M40 engines. It is positioned on 8 studs and fixed with M10 nuts. It has one hole for the Oil Cap, and one port for the breather hose.

When removing and replacing the rocker cover, it is worth replacing the rocker cover gasket.

Cam

Valves

Rocker Arms

Head Gasket

Breather Hose

To balance the pressure inside the head, a rubber hose runs from the top of the rocker cover to the throttle body.

Ancilliaries

Flywheel

Starter Motor

Engine Mounts

Servicing

Main article: Basic M5x Servicing


Common Problems

Common Upgrades

Useful websites

See also

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