Liquid cooled internal combustion engine

The coolant circuit (1) downstream of the coolant pump is divided into an engine cooling circuit (I) through the engine (2), crankcase and cylinder head and an exhaust circuit (II) with exhaust manifold (3) and turbocharger (4) and also a heat exchange circuit (III) with heat exchangers (9 and 8) resectively for the charging air and the untreated water. The circuits run in parallel and then re-combine upstream of the pump (1). Pressure gradient is adjusted by means of the exhaust and heat exchanger circuits (II,III), with all circuits at the same pressure gradient. A coolant thermostat (5) in the input side of the heat exchanger circuit (III) controls coolant flow through the untreated water exchanger (8) and the bypass (7) led round it and the coolant flows on through the charge air heat exchanger (9). Prefered engine design is double-banked vee type.