The X family was a group of SOHC straight-4 engines for supermini cars. It was produced from 1972 through 1988, when it was replaced by the PSA TU engine.
- XV — 1.0 L (954 cc)
- XW — 1.1 L (1124 cc)
- XZ — 1.2 L (1219 cc)
- XY — 1.4 L (1361 cc)
Read more about this topic: List Of PSA Engines