air flow path indicated by the arrows 92 in fig9 to provide rotor cooling engine cooling exhaust gases cooling and exhaust gases scavenging during the rotation of the rotors from position shown in fig9 to the position of the rotors in fig1 fresh cooling intake air is being added to and mixing with the exhaust gases arrows 50 as the gases move past the rotors thru the valve slots thus providing a unique means for the afterburning of the exhaust gases arrows 94 it is an important feature of this invention that this provision for afterburning occurs it is also an important feature of this invention that this provision also encourages the drawing out of additional fresh air by the high velocity passing of the exhaust gases thru the slots past the ports thus providing for improved afterburning of the exhaust gases fig1 illustrates the rotors at about the middle of the exhaust cycle with mixing and afterburning already taking place during the rotation of the rotors from the position of the rotors in fig1 to the position of the rotors in fig1 the exhaust cycle of the combustion chamber has been completed and the cooling intake air 54 is just begining to enter the combustion chamber during the rotation of the rotors from the position of the rotors in fig1 to their positions in fig1 the cooling intake air flow from the blower 72 thru conduits 74 and thru hollow shafts centers 76 to the interiors of all rotors 32 38 and thru intake ports 46 and thru slanted valve slots 48 which direct and encourage and impart to the intake air arrows 54 a swirling turbulent mixing of the intake gases enters the combustion chamber 60 as shown half.