Prince is the codename for a family of automobile straight-4 engines developed jointly by BMW and PSA Peugeot Citroën. It is a compact engine family of 1.4–1.6 L in displacement and includes most modern features including gasoline direct injection and variable valve timing.The BMW variants of the Prince engine are known as the N13. It replaced the Tritec engine family in the Mini and was introduced in the 2011 F20 116i and 118i.