A closed cycle combustion system for endothermic engines, comprising: - means for filtering combustion air entering in endothermic engines, comprising first filters with zeolite membranes, apt to divide said combustion air into inert nitrogen and oxygen; - means for molecular reassembling of the oxygen entering endothermic engines, supplied by means; - tanks for fuel or composite mixtures for feeding endothermic engines; - means for producing oxygen and hydrogen; - means for injecting fuel or composite mixtures, supplied by tanks, into endothermic engines, together with oxygen and hydrogen supplied by means; - means for exhaust gas recovery coming out from endothermic engines and partial reintroduction of said exhaust gases in combustion or reaction chambers of said endothermic engines; - means for cooling the exhaust gases reintroduced in said combustion or reaction chambers of said endothermic engines, characterized in that it comprises: - first means for filtering the exhaust gases coming out from endothermic engines, comprising second filters with zeolite membranes apt to divide said exhaust gases into carbon dioxide and carbon monoxide; - second means for filtering the exhaust gases coming out from endothermic engines, alternative to first filtering means, comprising third filters with zeolite membranes immersed in a bubbling fluid, apt to divide said exhaust gases into organic carbon, heavy hydrocarbons and methanol; - means for confining polluting substances obtained by the filtering of said exhaust gases coming out from said endothermic engines, supplied by said means, comprising airtight containers with watertight membranes, apt to determine an internal division into first and second chambers and, where first chambers are communicating with filtering means or and storage cylinders, and the second chambers are carrying watertight membranes; valves for reversible load of storage cylinders, associated to first chambers of airtight containers CE; storage cylinders of carbon dioxide and carbon monoxide, supplied by second filters with zeolite membranes comprised in filtering means or else of organic carbon, unburnt hydrocarbons and methanol supplied by third filters with zeolite membranes comprised in filtering means. - means for filtering combustion air entering in endothermic engines, comprising first filters with zeolite membranes, apt to divide said combustion air into inert nitrogen and oxygen; - means for molecular reassembling of the oxygen entering endothermic engines, supplied by means; - tanks for fuel or composite mixtures for feeding endothermic engines; - means for producing oxygen and hydrogen; - means for injecting fuel or composite mixtures, supplied by tanks, into endothermic engines, together with oxygen and hydrogen supplied by means; - means for exhaust gas recovery coming out from endothermic engines and partial reintroduction of said exhaust gases in combustion or reaction chambers of said endothermic engines; - means for cooling the exhaust gases reintroduced in said combustion or reaction chambers of said endothermic engines, characterized in that it comprises: - first means for filtering the exhaust gases coming out from endothermic engines, comprising second filters with zeolite membranes apt to divide said exhaust gases into carbon dioxide and carbon monoxide; - second means for filtering the exhaust gases coming out from endothermic engines, alternative to first filtering means, comprising third filters with zeolite membranes immersed in a bubbling fluid, apt to divide said exhaust gases into organic carbon, heavy hydrocarbons and methanol; - means for confining polluting substances obtained by the filtering of said exhaust gases coming out from said endothermic engines, supplied by said means, comprising airtight containers with watertight membranes, apt to determine an internal division into first and second chambers and, where first chambers are communicating with filtering means or and storage cylinders, and the second chambers are carrying watertight membranes; valves for reversible load of storage cylinders, associated to first chambers of airtight containers CE; storage cylinders of carbon dioxide and carbon monoxide, supplied by second filters with zeolite membranes comprised in filtering means or else of organic carbon, unburnt hydrocarbons and methanol supplied by third filters with zeolite membranes comprised in filtering means.