Abstract: A valve control arrangement for first and second inlet valves of an internal combustion engine includes two cams, one of which is optimized for operation at low speed and/or load, while the other cam is optimized for operation at high speed and/or load. The first valve is permanently driven and, when the second valve is deactivated, it is driven from the first cam by a first actuation lever. The second valve is driven by a second actuating lever after engagement actuation of a first coupling between the second actuation lever and a third actuating lever which is driven by the second cam. Another coupling between the first and second actuating levers couples the first valve with the second cam when required for optimum operation.

Abstract: An evaporative cooling system for an internal combustion engine has an equalizing tank which is sealed from the atmosphere and divided by a yielding wall into an air-equalizing chamber and a coolant chamber and which has a low flow-resistance connection to the suction side of a condensate pump.

Abstract: The representative evaporative cooling system disclosed in the specification includes a cooling pump in a condensate line leading from a condenser to an internal combustion engine and a fan associated with the condenser, and has a turbine disposed in the coolant vapor line leading from the engine to the condenser which utilizes the energy of the coolant vapor to drive the coolant pump and the fan.

Abstract: In the typical cooling system described in the specification, an internal combustion engine has coolant conduits connected to a coolant circuit for cooling the engine and to a heater circuit for heating the vehicle. The coolant circuit includes a valve to close the circuit during warming-up of the engine to permit fast warming-up of the vehicle and at high engine temperature conditions the coolant may be circulated through the heater circuit to provide additional heat removal from the coolant.