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Reciprocating internal combustion engine From Wikipedia, the free encyclopedia
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.
| BMW M51 | |
|---|---|
| |
| Overview | |
| Manufacturer | BMW |
| Production | 1991-2000 |
| 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 M51 is a water-cooled and turbocharged inline six-cylinder diesel engine with a Bosch VP37-swirl-chamber-injection.[1][2][3] 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[4] and two valves per cylinder.[2][4] Compared to the M21 the M51 now has tappets and a hydraulic valve lash adjustment.[2] The fuel injection in the first engines and all E36 models is controlled by the ECU Bosch DDE 2.1, which was replaced after the first technical revision by the DDE 2.2[4] This results in greater torque at lower revs.[4] For lubrication SAE 5W-40 oil is used.[5]
| Version | Power | Torque | Years |
|---|---|---|---|
| M51D25 UL | 85 kW (115 hp) at 4800 rpm | 222 N⋅m (164 lb⋅ft) at 1900 rpm | 1991–1997 |
| M51D25 OL | 105 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 UL | 85 kW (115 hp) at 4800 rpm[10][11] | 230 N⋅m (170 lb⋅ft) at 1900 rpm | 1996–1998 |
| M51D25TÜ OL | 105 kW (143 hp) at 4800 rpm[4] | 280 N⋅m (207 lb⋅ft) at 2200 rpm | 1996–1998 |
| M51D25TÜ OL | 105 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 |
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