PSA XUD engine


The PSA XUD is a diesel engine designed and built by PSA - Peugeot and Citroën. It is an Indirect injection engine, that uses a version of the Ricardo Consulting Engineers Ricardo Comet V prechamber cylinder head design. The engine comes in,, and 2.1-liter displacments. The 2.1 has 12 valves, all displacements were built either naturally aspirated or turbocharged. The XUD was the predecessor to the HDI range of engines. Early HDi Engines were a PSA design, later 16-valve engines were jointly developed with Ford.

Design

The XUD was available with either SOHC 8-valve or 12-valve heads. It was mainly applied transversally in front wheel drive vehicles, tilted by 30°. However, some applications in non-PSA vehicles had the engine installed longitudinally, with rear-wheel drive. The XUD is built in Citroën's plant in Trémery, near Metz.
Displacement ranges between, and all XU diesel engines have a stroke of either. The former was shared with the XU9. Bore sizes range from, some of which are shared with other XU engines.
Upon its release the engine was noted as one of the best diesel engines in the world with its high power output and refinement it made all other diesel engines seem agricultural. It was also particularly light, with a ready-to-run XUD9 weighing, 15% less than a comparable diesel of the previous generation.

Vegetable oil fuel

The engine, because it is indirect injection, with a slower combustion burn time than direct injection, is suitable to run on SVO. A feature of the Ricardo Comet pre-chamber design is that it makes the engine tolerant of low Cetane value fuels such as SVO. The viscosity of vegetable oil when cold is too great for rotary injection pumps,, preventing it from acting as a lubricant and increasing the workload on the distributor/rotary injection pump and damaging it. The Lucas EPIC pump fitted to the 2.1 L 12 valve turbo-diesel engine after 1995 is the weakest pump of all.

XUD7

The XUD7 has a displacement of, with a bore and a stroke of. Output is for the naturally aspirated version or for the turbocharged model. An intercooled turbocharged version was introduced later, with on tap. All are Diesel engines.
ModelOutputNotesModel of car
XUD7 T/KTurbo
XUD7 TETurbo with intercoolerCitroen BX TRD/TZD TURBO, Peugeot 405 Turbo, ROVER 200 MK2 TD
XUD7/KCitroën C15D/BX RD, Peugeot 205
XUD7/Zcatalyst

XUD9

The XUD9 has a displacement of, with a bore and a stroke of. Both turbocharged and naturally aspirated versions were produced. Most turbocharged versions feature an intercooler, although a limited number of installations in the Citroën Xantia featured a Turbocharger without intercooler. Both engines also featured either a Bosch or a Lucas mechanical fuel pump and injectors. The engine version with the Bosch pump is known to have been run with vegetable oil. The original XUD9 engine is known as the "square port" engine, as its cylinder head has square exhaust ports. Later XUD9A engines have oval ports.
ModelOutputNotesModel of car
XUD9DieselCitroën BX, Peugeot 205 Export, Peugeot 309, Talbot Horizon, Talbot 1510
XUD9 ADieselROVER 200 MK2 D
Citroën Berlingo
FSO Polonez
Citroën BX
Lada Niva
XUD9 TE/LDiesel turbo with intercoolerCitroën ZX
Citroën Xsara
Citroën Jumpy
Peugeot 306
Peugeot 405
Peugeot Expert
XUD9 SDDiesel turbo catalystSuzuki Samurai
XUD9 SDDiesel turbo catalystCitroën Xantia
Suzuki Baleno
Lada Niva
XUD9 TE/YDiesel turbo with intercooler catalystPeugeot 406
Citroën Xantia
XUD9/ZDiesel catalystHyundai Lantra

XUD11

The XUD11 was available in two displacements:
Both were 12-valve SOHC engines with a stroke. The naturally aspirated XUD11 A was bored to for a total displacement of, while the turbocharged ATE/BTE versions were reduced in bore to for a total of.
ModelOutputNotesModel of car
XUD11 ADiesel 12-valve SOHCCitroën XM, Peugeot 605
XUD11 ATEDiesel 12-valve SOHC turboCitroën XM
XUD11 BTEDiesel 12-valve SOHC turbo catalystPeugeot 406, Peugeot 605, Citroën Xantia

Vehicles

The engine has been installed into the following vehicles:-
Note: The Rover 100/Metro, Peugeot 106, and Citroën AX diesels used the much smaller TUD diesel engines, developed from the petrol PSA TU engine series.