| PSA XU engine | |
|---|---|
 | |
| Overview | |
| Manufacturer | PSA |
| Production | 1982–2001 |
| Layout | |
| Configuration | Inline-4 |
| Displacement | 1.6 L (1,580 cc) 1.8 L (1,761 cc) 1.8 L (1,775 cc) 1.9 L (1,905 cc) 2.0 L (1,995 cc) 2.0 L (1,997 cc) 2.0 L (1,998 cc) |
| Cylinder bore | 83 mm (3.27 in) 84 mm (3.31 in) 85 mm (3.35 in) 86 mm (3.39 in) |
| Piston stroke | 73 mm (2.87 in) 81.4 mm (3.20 in) 82 mm (3.23 in) 86 mm (3.39 in) 88 mm (3.46 in) 90 mm (3.54 in) |
| Cylinder block material | Cast iron, Cast aluminium alloy |
| Cylinder head material | Aluminium |
| Valvetrain | SOHC 2 valves x cyl. DOHC 4 valves x cyl. |
| Combustion | |
| Turbocharger | TR30R (on some versions) |
| Fuel system | Single or double-barrel carburetor Fuel injection |
| Fuel type | Petrol |
| Cooling system | Water-cooled |
| Output | |
| Power output | 80–600 PS (59–441 kW; 79–592 hp) |
| Torque output | 255–635 N⋅m (188–468 lb⋅ft) |
| Emissions | |
| Emissions control systems | Catalytic converter |
| Chronology | |
| Successor | PSA EW/DW engine |
The PSA XU is a family of internal combustion engines used in Citroën and Peugeot automobiles. It became the dominant mid-size engine in Peugeot and Citroën products through the 1980s and 1990s.
The XU design was introduced in 1981 with the Peugeot 305. It was a SOHC or DOHC straight-4 design with two or four valves per cylinder, using petrol as fuel. It was applied transversely in front wheel drive vehicles only, tilted by 30°. Displacement ranged between 1.6 and 2.0 L (1,580 and 1,998 cc), and all production XU gasoline engines had a bore of 83 or 86 mm (3.27 or 3.39 in). The engine uses an aluminium cylinder head in all models. All models' blocks are made, except XU10, in cast aluminium alloy with removable cast iron wet cylinder liners. XU10 blocks are made in cast iron, with bores machined directly in the block, without removable cylinder liners. Its first Citroën application was on the Citroën BX in 1982, where it appeared in 1.6 L (1,580 cc) format.
The XU was replaced by the more modern EW/DW family.