The BMW project

In mid-1973 BMW approached Dieter Konig with the idea of using the 680cc Konig flat-four cylinder engine in a BMW frame. A machine was built and tested at the Avis circuit, impressing the BMW executives with its performance.the Bmw-konig 680 hybrid was then put on the factory dyno, but the powerful Konig engine instantly blew the rear tyre apart! At the time a standard BMW 750 boxer would heat the tyre up to a dangerously high temperature in five minutes, and the 900 version in one minute. BMW walked away from the idea.