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Maybe I've got the nomenclature wrong, but I thought the secondary ports were ports 3 & 4 and always open. It was the auxiliary ports that I thought were ports 5 & 6, that were opened and closed by actuators.
Is it possible that each port in the Renesis has its own injector? 3 ports per rotor, 3 injectors per rotor=>1 injector per port?
According to Mazda, the auxiliary intake ports on the previous 2nd gen RX-7 were opened and closed by a cylindrical valve operated by exaust pressure.
The 2nd gen RXX-7 had 2 injectors per rotor chamber. The primary injector was in the intake passage next to the primary intake port. At high rpm and high load conditions, the secondary injector is used to provide additional fuel [edit - to the secondary port].
The renesis has 3 injectors per rotor chamber and it would make sense that each one would be placed by one of the 3 intake ports per chamber. The huge difference in the amount of fuel needed between 700 rpm and 9500 rpm is the reason for multiple injectors. 2 or 3 smaller injectors that work as needed are much more efficient that one very large injector.