Weird enough even for me: [URL]http://www.der-wankelmotor.de/Motoraeder/MZ-Motorrad/mz-motorrad.html[/URL] It's in German, so here's a rough translation: 1965 MZ rotary engine prototype with 175cc chamber volume. One of three prototypes. The rest of the paragraph just describes the different types of coating they tried on the chamber surface. TBH I had never heard of MZ doing something as technically advanced as this - I knew about a few other rotary engined bikes like the Van Veen or the Hercules, but I was really surprised to see MZ dabbling in this technology as well. The license alone must've cost them a fortune in ES 250s and Practika cameras. And no, I wasn't looking for rotary engined MZs, I was looking for information on some strange Mazda-built contraption...