| Motor 250/400 | |
|---|---|
 B-Motor at the Deutsches Museum | |
| Overview | |
| Manufacturer | Maschinenfabrik Augsburg |
| Designer |
|
| Production | 30 April 1896 – 6 October 1896 |
| Layout | |
| Configuration | Single-cylinder A-type, crosshead piston |
| Displacement | 19,635 cm3 (1,198.2 in3) |
| Cylinder bore | 250 mm (9.84 in) |
| Piston stroke | 400 mm (15.75 in) |
| Cylinder block material | Grey cast iron |
| Cylinder head material | Grey cast iron |
| Valvetrain | OHC, 2 valves |
| Combustion | |
| Operating principle | Diesel |
| Supercharger | Piston-type supercharger + intercooler (until 28 January 1897) None (from 28 January 1897) |
| Fuel system | Air-blast injection |
| Fuel type | Kerosine Petrol Ligroin Coal-tar creosote oil Paraffin oil Gas oil Fuel oil Solar oil Naphtha Benzene Shale oil Peanut oil Mains gas |
| Oil system | Manual |
| Cooling system | Water-cooled |
| Output | |
| Power output | 13.1 kW (17.8 PS) at 154/min |
| Torque output | 812 N⋅m (82.8 kp⋅m) at 154/min |
| Dimensions | |
| Diameter | 3,000 mm (120 in) (flywheel) |
| Chronology | |
| Predecessor | Motor 220/400 |
The Motor 250/400 is the first functional diesel engine. It was designed by Rudolf Diesel, and drawn by Imanuel Lauster. The workshop of the Maschinenfabrik Augsburg built two units, the A-Motor, and the B-Motor. The latter has been on static display at the Deutsches Museum in Munich since testing it came to an end. Throughout the late 1890s, several licensed copies of the Motor 250/400 were made. Most of these copies were very unreliable, which almost caused the diesel engine's demise.