M50B20 Engine


bmw-m50-b20-engine

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BMW M50 engine – six-cylinder piston engine with two overhead camshafts, which was submitted in January 1989 on 5-Series E34, and thus replacing the previously installed 2-valve M20. A little later, this engine was installed on the BMW 3 series E36 (sedan, touring, coupe, convertible and Baur).

BMW M50 engine is available in two versions, with a volume of 2.0 and 2.5 liters and produced in the Steyr factory. Until 1996, all 943,795 engines were produced.

M50B20 and M50TUB20 Engine Specs

Manufacturer  Munich Plant
Also called BMW M50
Production 1990-1996
Cylinder block alloy Cast iron
Configuration Straight-6
Valvetrain DOHC
4 valves per cylinder
Piston stroke, mm (inch) 66 (2.6)
Cylinder bore, mm (inch) 80 (3.15)
Compression ratio 10.5
11 (TU)
Displacement 1991 cc (121.5 cu in)
Power output 110 kW (150 HP) at 6,000 rpm
110 kW (150 HP) at 5,900 rpm (TU)
Torque output 190 Nm (140 lb·ft) at 4,700 rpm
190 Nm (140 lb·ft) at 4,200 rpm (TU)
Redline 6,500 rpm
HP per liter 75.3
Fuel type Gasoline
ECU Bosch Motronic 3.1
Siemens MS40.0
Siemens MS40.1 (TU)
Weight, kg (lbs)
Fuel consumption, L/100 km (mpg)
-City
-Highway
-Combined
for E36 320i
11.2 (21)
6.7 (35.1)
8.6 (27.4)
Turbocharger   Naturally aspirated
Oil consumption , L/1000 km
(qt. per miles)
up to 1.0
(1 qt. per 750 miles)
Recommended engine oil 5W-30
5W-40
10W-40
15W-40
Engine oil capacity, L (qt.) 5.75 (6.0)
Oil change interval, km (miles)  7,000-10,000
(4,500-6,000)
Normal engine operating temperature, °C (F) ~90 (194)
Engine lifespan, km (miles)
-Official information
-Real

400+ (250+)
Tuning, HP
-Max HP
-No life span loss
400+
190-200

bmw-m50-b20-engine

Applications

  • BMW E34 520i
  • BMW E36 320i

M50B20 engine problems and Reliability

BMW M50 engine is considered to be one of the most reliable engines of BMW. Listed below are the possible malfunction of the engine, but it is necessary to take into account the proper engine maintenance, because with proper maintenance, the engine will show itself in a good way:

  • Overheating: advice – check the radiator, pump, thermostat, the presence of air pockets in the cooling system and radiator cap;
  • Working with faults: recheck ignition coils, spark plugs and injectors;
  • Floating rpm: possible causes of failure – the failure of the valve or idle throttle position sensor;
  • Coolant leak – cracked expansion tank;
  • Failure of individual ignition coils;
  • Burning of power ignition control keys;
  • Oil leaking at the junction of the oil filter bowl, valve cover gasket, front cover and tray;
  • Lack of the fuel supply;

Uncontinuous oil leaking?! That is a huge problem! Fortunately we know how to help. Read this top 10 radiator stop leak products.

The BMW M50 engine was replaced by the BMW M52.

https://youtu.be/az97k4hjVzc

 

E36 m50b20 engine sound

https://youtu.be/J1OJGO8M8t4

Dan Hoffman

Dan is a co-founder of Engineswork. He knows everything about internal combustion engines. Ask your questions in comments down below this article - he will be glad to help you anytime.

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