Originally Posted by John Slade
...Perhaps not as bullet-proof as the 13b, but then.... who's firing bullets anyway. As you say, 13B redundancy (two injectors, 2 plugs per rotor) and simplicity (no valves, camshaft, pushrods, small-end bearings) is hard to beat.
I think one of the advanatages of the Subie is that it is a little better understood in AC applications than the 13B. This is one of the reasons that some many people want you to put more time on your bird.
Ultimately, I think the Mazda rotary engine will be a good choice for Cozy, et al, installations turbocharged or not. It biggest drawback is having to either add or inject oil into the rotors.