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| BMW M21 | |
|---|---|
 | |
| Overview | |
| Manufacturer | BMW Motoren GmbH Steyr |
| Production | 1983–1991 |
| Layout | |
| Configuration | Straight-6 |
| Displacement | 2.4 L (2,443 cc) |
| Cylinder bore | 80 mm (3.15 in) |
| Piston stroke | 81 mm (3.19 in) |
| Cylinder block material | Cast iron |
| Valvetrain | SOHC 2 valves x cyl. |
| Compression ratio | 22.0:1 |
| Combustion | |
| Operating principle | Diesel |
| Turbocharger | Garrett T03 ('td' versions), None ('d' versions) |
| Fuel system | Swirl chamber injection, distributor fuel injection pump |
| Fuel type | Diesel fuel 45 CN (DIN 51601) |
| Cooling system | Water-cooled |
| Output | |
| Power output | 63–85 kW (84–114 hp) |
| Torque output | 152–220 N⋅m (112–162 lb⋅ft) |
| Chronology | |
| Predecessor | None |
| Successor | M51 |
The BMW M21 is a straight-six diesel engine developed by the Bavarian engine manufacturer BMW. It has swirl chamber injection and is based on the M20 petrol engine[1] and was produced for BMW by the Upper Austrian Steyr engine plant from 1983 to 1991. It was succeeded by the M51.[2]