Look what I found: R 113 W 33-29[edit]In 1968, Mercedes-Benz fitted a 280 SL with a 206 PS (152 kW; 203 hp) M50F Wankel engine, denoted as R 113 W 33-29. With a top-speed of 205.1 km/h (127.4 mph), a 0-60 acceleration of 8.7 seconds, and almost inaudible compared to regular SLs, it provided quite a surprise encounter for their owners in southern Germany at the time.[8]
http://en.wikipedia.org/wiki/Mercedes-Benz_W113I heard the dropped the wankel because it didn't meet MB life requirements of >150Kmiles
