Abstract: An internal combustion engine, Z-engine. The compression part and the working part are separated. New gas is transported to the upper side of the piston. Below there is a small chamber corner. When the piston comes nearer the upper hollow part, the combustion gases go out from the cylinder through exhaust-valves. After the changing of the gas, before filling the upper chamber, there is a secondary compression, the firing of the mix, or fire. In advance of the compression can be other than the volume of the working pistons together. The side effect of the piston can be taken away by means of a double cam mechanism.

Abstract: The invention deals with a new type of combustion engine, Z4-engine. It has an insulated compressor part and a work part. The temperature of the compressed gas can be controlled, for example cool. The new gas shall be transferred over the piston during a small crank angle, when the piston closes the top gear centre. The fuel shall be injected to the hot air. After the gas exchange, before the top dead centre, occurs the secondary compression of the gas, the self ignition of the mixture or the ignition. The exhaust gases exit the cylinder through the exhaust valve. The delivery rate of the compressor can be different from the stroke volume of the working pistons together. The side force of the piston can be removed by means of a twin crank mechanism. Also a normal crank mechanism is possible, thus the insulated compressor part can be for example a screw compressor.