BMW M51

Last updated
BMW M51
M51 Motor.JPG
Overview
Manufacturer BMW
Production1991-2000
Layout
Configuration Inline-6
Displacement 2.5 L; 152.4 cu in (2,497 cc)
Cylinder bore 80 mm (3.15 in)
Piston stroke 82.8 mm (3.26 in)
Cylinder block material Cast iron
Valvetrain SOHC 2 valves x cyl.
Compression ratio 22.0:1
Combustion
Turbocharger Single turbo, tds-engines also have an intercooler
Fuel system Swirl-chamber-injection
Management Bosch DDE 2.1
Fuel type Diesel fuel (DIN 51601)
Cooling system Water-cooled
Output
Power output 85–105 kW (114–141 hp)
Torque output 222–280 N⋅m (164–207 lb⋅ft)
Dimensions
Dry weight 132 kg (291 lb)
Chronology
Predecessor BMW M21
Successor BMW M57

The BMW M51 is an inline-6 cylinder Diesel engine produced by the Upper Austrian BMW plant in Steyr from July 1991 through February 2000. Its predecessor is the BMW M21; the successor is the BMW M57.

Contents

Description

The M51 is a water-cooled and turbocharged inline six-cylinder diesel engine. It is an indirect injection design with fuel supplied by a Bosch VP37 mechanical injection pump. [1] [2] [3] The displacement is 2,497 cc (152.4 cu in) and the compression ratio is 22.0:1.

Some engine variants have an intercooler in addition to the turbocharger; vehicles so equipped can be identified by the designation tds. [2] The M51 has a cast iron block and aluminum head, one chain driven overhead camshaft, [4] and two valves per cylinder. [2] [4] Compared to the M21 the M51 features tappets and hydraulic valve lash adjustment. [2] The fuel injection in the first engines and all E36 models is controlled by the Bosch DDE 2.1, which was replaced after the first technical revision by DDE 2.2, [4] resulting in greater torque at lower revs. [4] For lubrication SAE 5W-40 oil is used. [5]

VersionPowerTorqueYears
M51D25 UL85 kW (115 hp)
at 4800 rpm		222 N⋅m (164 lb⋅ft)
at 1900 rpm		1991–1997
M51D25 OL105 kW (143 hp)
at 4800 rpm		260 N⋅m (192 lb⋅ft)
at 2200 rpm		1991–1996
Opel X25DT [a] 96 kW (130 hp)
at 4800 rpm [6] [7] [8] [9] 		250 N⋅m (184 lb⋅ft)
at 1400 rpm		1994–2001
M51D25TÜ UL85 kW (115 hp)
at 4800 rpm [10] [11] 		230 N⋅m (170 lb⋅ft)
at 1900 rpm		1996–1998
M51D25TÜ OL105 kW (143 hp)
at 4800 rpm [4] 		280 N⋅m (207 lb⋅ft)
at 2200 rpm		1996–1998
M51D25TÜ OL105 kW (143 hp)
at 4600 rpm [4] 		1998–2000
M51D25M1 [b] 100 kW (136 hp)
at 4400 rpm [12] 		270 N⋅m (199 lb⋅ft)
at 2300 rpm		1995-2001
  1. ↑ For Opel Omega B only
  2. ↑ For Range Rover P38 DSE 2.5 LP2 only.

Applications:

See also

References

  1. ↑ BMW E38 7 Series 725 tds Technical data
  2. 1 2 3 4 Die BMW-Sportdiesel: Von 524td E28 über 530d E39 bis BMW M550d F10 (german)
  3. ↑ "BMW M41 and M51 Diesel Engines". www.unixnerd.demon.co.uk. Archived from the original on 10 October 2016.
  4. 1 2 3 4 5 6 Etzold: So wird's gemacht: pflegen – warten – reparieren. Band 102, BMW 5er E39 Archived 2017-05-17 at the Wayback Machine Delius Klasing Verlag. Pages 12 and 13 (german)
  5. ↑ Übersicht der Motorölqualitäten. Page 7 (german)
  6. ↑ "Vauxhall V94 - Omega B confidential launch guides". vauxpedianet.uk2sitebuilder.com. Archived from the original on 1 October 2021. Retrieved 2 October 2021.
  7. ↑ Opel Omega B 2.5 TD 96 kW 130 PS - Motor: 25DT, X25DT, X25TD - Eco Optimierung / Leistungssteigerung Archived 2016-06-23 at the Wayback Machine (german)
  8. ↑ "Detailed specs review of 1995 Opel Omega 2.5 TD model for Europe". www.automobile-catalog.com. Retrieved 14 August 2021.[ permanent dead link ]
  9. ↑ "Opel Omega 2.5 TD CD Manual 4 doors specs". www.Cars-Data.com. Retrieved 14 August 2021.
  10. ↑ "Die BMW Turbodiesel". bmw-grouparchiv.de. Archived from the original on 18 May 2023. Retrieved 30 September 2021.
  11. ↑ "Betriebsanleitung zum Fahrzeug. [BMW 5er Limousine/touring (E39)]". bmw-grouparchiv.de. Archived from the original on 18 May 2023. Retrieved 30 September 2021.
  12. ↑ Automobile Catalogue: 1997 Range Rover 2.5 DSE (model for Europe ) specifications & performance data review Archived 2016-05-06 at the Wayback Machine .
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