Abstract: At least one inlet channel (4) for each cylinder is developed as a filler channel in which there is a flap valve (13) turning on an axis (12). During full load operation, the flap valve (13) is in a rest position, which does not influence the flow through the inlet channel (4). During partial load operation, however, the flap valve (13) is in a working position, in which it shapes the flow in the inlet channel so unsymmetrically that at the mouth (6) of the inlet channel (4) leading into the cylinder (1) the compressed air flowing out in large quantities has a tendency toward spiral and/or turbulence-reinforcing directions. In this way, fuel preparation is improved during the partial load operation of the motor, leading to combustion with low smoke and noxious substance levels and low consumption.

Abstract: To simplify control, decrease start-up time and improve efficiency, a heat storage device is provided connected to receive hot combustion gases from a burner, the heat storage device preferably including a vessel which contains a substance changing in phase between solid and liquid, and being heated by the exhaust gases from the burner. A heat pipe is in heat transfer relation to the substance, extending in a predetermined direction, and ducts, pipes or conduits conducting the combustion gases from the burner extend in parallel to the heat pipe, through the substance, or surrounding a vessel containing the substance. Preferably a group of heat storage units are joined to common inlet and outlet manifolds connecting combustion gases, arranged such that the flow speed of combustion gases further downstream is higher than that further upstream, to equalize heat transfer and hence storage capability and storage times of the individual units.