Whether dealing with technical details of the first six-cylinder built in 1917 for biplanes, the legendary motorcycle engines which set new world records, the volume production car engines which have provem themselves a million times over the peak-performance units which provided BMW with Grand Prix successes - this book not only provides information on their development and context but also reveals data and facts which have never been published before. The first volume is dealing with events prior to 1945, the second volume is covering the post-war period. Together they form a single complete work which can certainly claim to be unique, not only in the symbiosis of its technological and historical contents but also in its style and presentation.