exchangers that harvest exhaust has heat water in its delivery path from the condenser sump pump to the combustion chamber is pumped through one or more main steam supply lines 21 for each cylinder the main steam line 21 passes through a pre heating coil 23 that is wound around each cylinder skirt adjacent to that cylinder 39 s exhaust ports the vapor exiting the exhaust ports gives up heat to this coil which raises the temperature of the water being directed through the coil toward the combustion chamber reciprocally in giving up heat to the preheating coils the exhaust vapor begins the process of cooling on its path through these coils preparatory to entering the condenser the positioning of these coils adjacent to the cylinder exhaust ports scavenges heat that would otherwise be lost to the system thereby contributing to the overall efficiency of the engine in the next phase the air is directed through heat exchangers 42 where the air is heated prior to entering the steam generator 20 see fig2 and 3 in the steam generator 20 the preheated air is mixed with fuel from a fuel atomizer 41 see fig8 an igniter 43 burns the atomized fuel in a centrifuge causing the heavy fuel elements to move towards the outer sides of the combustion chamber 22 where they are consumed the combustion chamber 22 is arranged in the form of a cylinder which encloses a circularly wound coil of densely bundled tubes 24 forming a portion of the steam supply lines leading to the respective cylinders the bundled tubes 24 are heated by the burning fuel of the combustion nozzle burner assembly 40 comprising the air blowers.