BMW M21
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 and was produced for BMW by the Upper Austrian Steyr engine plant from 1983 to 1991. It was succeeded by the M51.
| 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 |
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