Patent ID: 8671907

Claim:
A split-cycle variable capacity rotary spark ignition engine comprising: at least a first rotary configuration (C 1 ) including plurality of repetitively volume variable working chambers adapted to carry out the combustion-expansion and exhaust phases of a four phase engine cycle; at least a second rotary configuration (C 2 ) including plurality of repetitively volume variable working chambers adapted to carry out the intake and compression phases of a four phase engine cycle, wherein the working chambers of the first rotary configuration (C 1 ) has sidewalls ( 24 ) with at least a first exhaust port ( 25 ) and at least a second exhaust port ( 26 ) and wherein the working chambers of the second rotary configuration (C 2 ) has sidewalls ( 24 ) with at least a first intake port ( 35 ) and at least a second intake port ( 36 ); periodic seal means for periodically dividing each of successive working chambers into a volume expanding leading portion and a volume contracting trailing portion, corresponding to seal elements ( 73 , 74 ) of the first rotary configuration (C 1 ) and to seal elements ( 75 , 76 ) of the second rotary configuration (C 2 ); means for sequentially transferring compressed gases from the second rotary configuration (C 2 ) to the first rotary configuration (C 1 ), corresponding to gas passages ( 80 , 81 ), inlet check valves ( 82 , 84 ) of the second rotary configuration (C 2 ) and outlet control valve arrangements ( 83 , 85 ) of the first rotary configuration (C 1 ); means for discharging variable fraction of trapped intake gas during compression phases, corresponding to gas discharge valves ( 77 , 78 ) and a second phase altering mechanism ( 101 ); means for modifying phase relations between the first rotary configuration (C 1 ) and the second rotary configuration (C 2 ), corresponding to a first phase altering mechanism ( 100 ).