| Mercedes-Benz MB503 | |
| Manufacturer: | Mercedes-Benz |
| Production: | 1937-1939 |
| Bore: | NaNinches |
| Stroke: | 7.09inches |
| Displacement: | NaNL |
| Valvetrain: | 24-valve, SOHC, two-valves per cylinder |
| Supercharger: | Roots-type supercharger |
| Power: | NaNhp |
| Torque: | NaNlbft |
| Fuelsystem: | Fuel injection |
| Fueltype: | Gasoline |
| Coolingsystem: | Water-cooled |
| Oilsystem: | Dry sump |
| Weight: | NaNkg (-2,147,483,648lb) |
The Mercedes-Benz MB 503 was a German prototype four-stroke V-12 gasoline marine and aircraft engine, designed and concepted before World War II. The MB 503 was based on and derived from the Daimler-Benz DB 603 inverted V-12 aircraft engine. It was a liquid-cooled 12-cylinder inverted V12 enlargement of the DB 601, which was in itself a development of the DB 600.[1] [2] [3] [4] The eventual powerplants chosen to be used in the Panzer VIII Maus super-heavy tank were the MB 509 V-12 gasoline engine, derived from the Daimler-Benz DB 603; and also the MB 517 V-12 diesel engine.