Hi
Rotry engines always had issues with smog. In order
to get them to work, they were not vary fuel efficient.
Still, a lot of Hp in a small package.
Dwight
I always figured they'd make a good basis for a turbocompound engine,
especially since the emissions get worse as the engine speed increases
(even less combustion time). Use a turbocharger, bleed off air into a
combustion chamber and use the heated (now fairly clean) air to drive a
quill-shaft turbine.
Gordon.