M20B25 BMW M20B25

Рядний 6-циліндровий двигун BMW з атмосферним впорском, відомий своєю надійністю та довговічністю.

Brand: BMW Type: Petrol Configuration: Inline-6 Production Years: 1985 - 1993 Production: Munich, Germany
86 Brand engines
7 Modifications

Technical Specifications

Engine Displacement 2.5 L (2,494 cc)
Configuration Inline-6
Number of Cylinders 6
Valves per Cylinder 2
Power 170 - 171 л.с.
Torque 222 - 226 Н*м
Cylinder Bore 84.00 mm
Piston Stroke 75.00 mm
Compression Ratio 8.8:1
Firing Order 1-5-3-6-2-4
Fuel System Bosch L-Jetronic
Aspiration Naturally Aspirated
Intercooler No
Maximum RPM 6,000 rpm
Max Torque RPM 4,300 rpm
Valve Train SOHC
Timing Drive Belt
Timing belt replacement interval 60,000 km
Block Material Cast Iron
Head Material Aluminum
Engine Weight 140 kg
Dimensions (L×W×H) null mm
Lubrication System Wet sump
Cooling System Liquid cooling

Additional Information

Engine Family BMW M20 engine series
Manufacturing Plant Munich, Germany
Predecessor M20B23
Successor M50B25

Maintenance

Engine Oil Capacity 4.25 L (with filter: 4.5 L)
Recommended Viscosity 10W-40
Oil Standard API SL
Recommended Brands Castrol GTX, Mobil 1, Shell Helix
Oil Change Interval 10 000 km or 12 mo
Oil Filter 11421730389
Air Filter 13721730448
Replace every 30 000 km
Fuel filter 13321720101
Spark Plugs Type: Copper
Part number: 12129061872
Gap: 0.7 mm
Quantity: 6 pcs
Replace every 20 000 km
Coolant Capacity 10 L
Coolant Type G11 (BMW Coolant)
Coolant Change Interval 60 000 km
Thermostat Opening Temperature 80°C
Operating Temperature 85°C
Max Operating Temperature 110°C
Critical Temperature 120°C
Annual Maintenance Cost 500-800 USD

Reliability

Reliability rating: 8/10

Expected lifespan: 300 000 km

Common problems

Problem Severity Mileage Repair cost
Timing belt failure High 60000-80000 km $500-1000
Coolant leaks Medium 100000-150000 km $200-500

Known defects

  • Weak timing belt tensioner
  • Oil leaks from valve cover gasket

Tuning potential

Tuning potential: Medium | Max. safe power: 250 hp

Stage Power Torque Method Cost
Stage 1 190 hp 240 Nm ECU remap
Reliability impact: Minimal 		$400
Stage 2 210 hp 260 Nm ECU, Exhaust, Intake
Required: Performance camshaft, Exhaust system
Reliability impact: Low 		$1500
Stage 3 230 hp 280 Nm -
Required: Turbo kit, Forged pistons
Reliability impact: Medium 		$5000

Popular modifications

  • Cold air intake
  • Performance exhaust
  • ECU remap

Tuning limitations

  • Stock internals limit high boost applications
  • Cooling system upgrades needed for sustained high power

Детальні технічні характеристики

2
модифікацій
170–170
к.с.

Спільні характеристики

Acceleration (0-100 km/h) 7.9 s
Back suspension Independent, spring
Back track width 1470 mm
Body type Roadster
Boost type none
Capacity 2494 cm3
Car class S
City driving fuel consumption per 100 km 12.9 l
Clearance 120 mm
Compression ratio 8.5
Country Germany
Curb weight 1250 kg
Cylinder bore 84.0 mm
Cylinder layout inline
Engine code M20B25
Engine model m20b25
Engine placement Front, longitudinal
Engine type Gasoline
Front brakes ventilated disc
Front suspension Independent, spring
Front track width 1456 mm
Fuel 92
Fuel tank capacity 55 l
Full weight 1460 kg
Height 1277 mm
Highway driving fuel consumption per 100 km 6.8 l
Injection type distributed injection (multipoint)
Length 3921 mm
Max speed 225 km/h
Min trunk capacity 260 l
Mixed driving fuel consumption per 100 km 9.4 l
Number of cylinders 6
Number of doors 2
Number of gear 5
Number of seater 2
Rear brakes Disc
Steering wheel position Left
Stroke cycle 75.0 mm
Timing belt SOHC
Valves per cylinder 2
Wheelbase 2447 mm
Width 1690 mm

Модифікації двигуна

2.5 MT (170 hp)
Привід Rear wheel drive КПП Manual Z1 E30/Z 1988–1991
170 hp
engine
Engine power 170 hp
Max power at RPM to 5 800 RPM
Max trunk capacity 260 l
Maximum torque 222 N*m
Turnover of maximum torque 4300 RPM
fuel
Cruising range from 430 to 810 km
transmission
Drive wheels Rear wheel drive
Gearbox type Manual
other
Front track 1456 mm
Front/rear axle load 665/820 kg
Payload 210 kg
Rear track 1470 mm
Turning circle 10.3 m
2.5 MT RWD (170 hp)
Привід Rear wheel drive КПП Manual Z1 E30/Z 1988–1991
170 hp
engine
Engine power 170 hp
Max power (kW) 125 kW
Max power at RPM 5800 RPM
Maximum torque 222 N*m
Turnover of maximum torque 4300 RPM
transmission
Drive wheels Rear wheel drive
Gearbox type Manual

Cars with the M20B25 engine

This engine was fitted to 3 models

Photo Brand Model Generation Production years
No photo
 BMW 3 Series 3 series (E30) 1982 - 1994
No photo
 Alpina B3 B3 (E30) 1987 - 1992
No photo
 Alpina C2 C2 (E30) 1985 - 1987

All modifications (7)

Vehicle Generation Modification Power Gearbox Drive
BMW 3 Series 3 series (E30) BMW 320i 2.0 л.с. 150 5-МКП 2WD 150 hp 5-МКП 2WD
BMW 3 Series 3 series (E30) BMW 320i 2.0 л.с. 150 4-Автомат 2WD 150 hp 4-Автомат 2WD
BMW 3 Series 3 series (E30) BMW 325i 2.5 л.с. 192 5-МКП 2WD 192 hp 5-МКП 2WD
BMW 3 Series 3 series (E30) BMW 325i 2.5 л.с. 192 4-Автомат 2WD 192 hp 4-Автомат 2WD
Alpina B3 B3 (E30) B3 2.5 192 л.с. 5-МКП 2WD 192 hp 5-МКП 2WD
Alpina C2 C2 (E30) 2.5 L 4-циліндровий 170 л.с. 5-МКП 2WD 170 hp 5-МКП 2WD
Alpina C2 C2 (E30) 2.5 L 4-циліндровий 170 л.с. 4-Автомат 2WD 170 hp 4-Автомат 2WD

Interesting Facts

  • The M20B25 was one of the first BMW engines to feature a timing belt instead of a chain.
  • It was known for its smooth operation and reliability.

Applications

Total produced: null

Vehicle Generation Years Power Markets
BMW 3 Series E30 1985-1991 170hp Europe, USA
BMW 5 Series E34 1988-1990 170hp Europe, USA

Compatible transmissions: 5-speed Manual, 4-speed Automatic

Drive types: RWD

Fuel Economy

Fuel Type Petrol 95
Octane Rating Minimum: 91 | Recommended: 95
Consumption (City) 13 L/100km
Consumption (Highway) 8 L/100km
Consumption (Combined) 10.5 L/100km
Real Consumption 11.5 L/100km
Fuel Tank Capacity 70 L
Range 667 km
Cost per 100 km 15-20 USD

Emissions Standards

Emission Standard Euro 1
CO₂ Emissions 250 g/km
Particulate Filter (DPF) Absent
AdBlue Not Required

Comparison with competitors

Engine Brand Displacement Power Torque
M103 Mercedes-Benz 2,962 cc 188 hp 260 Nm

Pros

  • Smooth inline-6 operation
  • Reliable and durable
  • Good power output for its time

Cons

  • Timing belt requires regular maintenance
  • Higher fuel consumption compared to modern engines