If we lived in a world of rotaries and BMW came out with the S85 we'd say that piston engines were emotive and fun but too unreliable for mainstream use. When w

If we lived in a world of rotaries and BMW came out with the S85 we'd say that piston engines were emotive and fun but too unreliable for mainstream use. When we refer to rotary engines we mostly talk about two generations of one engine from one manufacturer used in sports cars that were designed before emissions targets changed.