Mercedes-Benz MB503 engine

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.

Mercedes-Benz MB503
Overview
Manufacturer	Mercedes-Benz
Production	1937–1939
Layout
Configuration	60° V12
Displacement	42.35–44.5 L (2,584–2,716 cu in)
Cylinder bore	6.22–6.38 in (158.0–162.1 mm)
Piston stroke	7.09 in (180.1 mm)
Valvetrain	24-valve, SOHC, two-valves per cylinder
Combustion
Supercharger	Roots-type supercharger
Fuel system	Fuel injection
Fuel type	Gasoline
Oil system	Dry sump
Cooling system	Water-cooled
Output
Power output	580–1,200 hp (433–895 kW)
Torque output	1,646–2,521 lb⋅ft (2,232–3,418 N⋅m)
Dimensions
Dry weight	790–920 kg (1,742–2,028 lb)

See also

• Mercedes-Benz MB507 - Diesel variant based on the Daimler-Benz DB 603.