The D1 100 was equipped with a rotary disc valve engine and was made to be a workhorse. This engine was used for a long time ...

By the late 1920s, he was focused on creating a rotary valve control for a motorcycle engine — and in 1934, successfully ...

After all, VW head Ferdinand Piech is an avid motorcycle enthusiast and had ... for the pioneering work it performed on the Wankel rotary engine, NSU first rose to fame after World War II with ...