Abstract: A cycle controlled sliding valve in a heating chamber combustion engine is provided. The valve includes a piston disposed for reciprocal movement within a cylinder, a piston-extension disposed for movement within the cylinder, a connecting rod connected to the piston, a pinion carried by the connecting rod, and a rack engaged by the pinion. The rack engages the piston-extension such that the latter is capable of movement in the axial direction of the cylinder away from or towards the piston. Such movement is caused by the swinging of the connecting rod due to crankshaft rotation. A path is provided within the cylinder walls which leads to the heating chamber. When an opening in the piston-extension is aligned therewith, communication is established between the cylinder and the heating chamber. In operation, the path leading to the heating chamber will open later during the up-stroke and will close later during the down-stroke.

Abstract: A heating-chamber is provided for a heating-chamber combustion engine. A piston is provided with a detachable extension on the flat bottom of the piston, which towers upwardly and reaches during the upstoke into a pocket of the cylinder head. The detachable extension has a slit located close to the bottom of the piston. An opening in the cylinder wall is provided, opening a path to the heating-chamber. The path is located near the cylinder head so, that in the highest position of the piston the slit in the detachable extension and the opening in the cylinder wall line up with each other, keeping the opening in the cylinder wall closed in all but the highest position of the piston.