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M51 Motor.JPG
Displacement2.5 L; 152.4 cu in (2,497 cc)
Cylinder bore80 mm (3.15 in)
Piston stroke82.8 mm (3.26 in)
Block materialCast iron
ValvetrainSOHC 2 valves x cyl.
Compression ratio22.0:1
TurbochargerSingle turbo, tds-engines also have an intercooler
Fuel systemSwirl-chamber-injection
ManagementBosch DDE 2.1
Fuel typeDiesel fuel (DIN 51601)
Cooling systemWater-cooled
Power output85–105 kW (116–143 PS)
Torque output222–280 N⋅m (164–207 lb⋅ft)
Dry weight132 kg (291 lb)
PredecessorBMW M21
SuccessorBMW 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.


The M51 is a water-cooled and turbocharged inline six-cylinder diesel engine with a Bosch VP20-swirl-chamber-injection.[1][2] The displacement is 2.5 L; 152.4 cu in (2,497 cc) and the compression ratio is 22.0:1.

Some engine variants have an intercooler in addition to the turbocharger, they can be identified by the tds.[2] The M51 is an engine made of cast iron, it has one chain driven overhead camshaft[3] and two valves per cylinder.[2][3] Compared to the M21 the M51 now has tappets and a hydraulic valve lash adjustment.[2] The fuel injection in the first engines is controlled by the ECU Bosch DDE 2.1, which was replaced after the first technical revision by the DDE 2.2.[3] This results in greater torque at lower revs.[3] For lubrication SAE 5W-40 oil is used.[4]

Engine Power output Torque Year
M51D25 UL 85 kW (116 PS) @ 4800 rpm 222 N⋅m (164 lb⋅ft) @ 1900 rpm 1991–1997
M51D25 OL 105 kW (143 PS) @ 4800 rpm 260 N⋅m (192 lb⋅ft) @ 2200 rpm 1991–1996
X25DT[5][A 1] 96 kW (131 PS) @ 4800 rpm 250 N⋅m (184 lb⋅ft) @ 1400 rpm 1994–2001
M51D25TÜ UL[3] 85 kW (116 PS) @ 4800 rpm 230 N⋅m (170 lb⋅ft) @ 1900 rpm 1996–1998
M51D25TÜ OL[3] 105 kW (143 PS) @ 4800 rpm 280 N⋅m (207 lb⋅ft) @ 2200 rpm
M51D25TÜ OL[3] 105 kW (143 PS) @ 4600 rpm 1998–2000
M51D25M1[6][A 2] 100 kW (136 PS) @ 4400 rpm 270 N⋅m (199 lb⋅ft) @ ? rpm until 1999
  1. ^ For Opel Omega B only
  2. ^ For Range Rover DSE 2.5 P38 LP2 only


See also

External links


This page was last edited on 25 June 2020, at 03:55
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