Piston machines are the most used power and work machines in the mechanical engineering industry. The piston machines are divided in so-called reciprocating and rotary piston machines. With the first one a reciprocating motion is transformed to a rotary motion in the case of the power machine and conversely in the case of the working machine. Today rotary piston machines are almost exclusively used as work machines. Important innovations and intensive researches are practiced particularly for the use of the piston machines as an internal combustion engine. Therefore the mixture formation and the combustion process, with their consequences in terms of emission and fuel-consumption are int the center of attention.