Daimler-Benz DB 604
The Daimler-Benz DB 604 was an experimental German 24-cylinder aircraft engine, which did not progress beyond the initial engine testing phase and was ultimately abandoned in 1942. == Design and development == The DB 604 was unique among the DB 600 series of aircraft engines for having its 24 cylinders arranged in an X, with four inline rows of six cylinders.