The Daimler-Benz DB 603 engine was a German aircraft engine used during World War 2. It was a liquid-cooled 12-cylinder inverted V12 enlargement of the DB 601, which was in itself a development of the DB 600. Production of the DB 603 commenced in May 1942, and with a 44.52 litre displacement figure, was the largest displacement inverted V12 aviation engine to be produced and used in front line aircraft of the Third Reich during World War II. The DB 603 powered several aircraft, including the Do 217 N&M, Do 335, He 219, Me 410 and Ta 152C.