The PSA XUD is a diesel engine designed and built by PSA — Peugeot and Citroën. It is an Indirect injection (IDI) 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 displacements. 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 also shared with other XU engines.

Upon its release the engine was noted as one of the best diesel engines (for cars and light vans) 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 (pure vegetable oil). 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, (in particular the weaker Lucas CAV pump, the Bosch VE fuel pump is superior), 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 carXUD7 T/KTurbo Peugeot 205 Dturbo, Peugeot 309 XRDT/GRDT/SRDTurbo/GRX DTXUD7 TETurbo with intercooler Citroën BX TRD/TZD Turbo, Peugeot 405 Turbo, Honda Concerto TD, Rover 200 MK2 TDXUD7/KCitroën C15D, Citroën BX RD, Peugeot 205, Citroën Xsara, Citroën VisaXUD7/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 (and noticeably improved) XUD9A engines have oval ports.

PSA Group licensed a modified version of the naturally aspirated version of the engine with a catalytic converter designated the XUD9/Z to Hyundai which was rated at 50kw. It was used in the European specification of the Lantra (1996–1999).

ModelOutputNotesModel of carXUD9Diesel Citroën BX, Peugeot 205 (export), Peugeot 305, Peugeot 309, Talbot Horizon, Talbot 1510 (Finland only)XUD9 ARover 200Citroën BerlingoFSO PolonezCitroën BX Lada Niva LDV PilotXUD9 TE/LDiesel turbo with intercoolerCitroën ZXCitroën XsaraCitroën JumpyPeugeot 306Peugeot 405Peugeot ExpertXUD9 SDDiesel turbo catalystSuzuki SamuraiXUD9 SDCitroën XantiaSuzuki BalenoLada NivaXUD9 TE/YDiesel turbo with intercooler catalystPeugeot 406Citroën Xantia Citroën ZXXUD9/ZDiesel catalystHyundai Lantra

XUD11 The XUD11 was available in two displacements: — XUD11 A naturally aspirated — XUD11 ATE/BTE turbocharged

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 . The BTE engines used a Lucas EPIC (Electronically Programmed Injection Control) fuel pump, whereas the ATE engines used a Bosch injection pump with a throttle cable.

ModelOutputNotesModel of carXUD11 ADiesel 12-valve SOHCCitroën XM, Peugeot 605XUD11 ATEDiesel 12-valve SOHC turboCitroën XMXUD11 BTEDiesel 12-valve SOHC turbo catalystPeugeot 406, Peugeot 605, Citroën Xantia

Vehicles The engine has been installed into the following vehicles:

Auverland A3 Citroën BX Citroën Visa Citroën C15 Citroën ZX Citroën Xsara Citroën Berlingo Citroën Xantia Citroën XM Eurovan (PSA/Fiat joint venture) Sevel Nord Citroën Evasion/Synergie/C8 Citroën Jumpy (Dispatch in UK) Fiat Ulysse Fiat Scudo Peugeot 806/807 Peugeot Expert Lancia Zeta/Phedra Sevel Sud — Larger Panel Van PSA/Fiat Ducato joint venture Citroën C25 Citroën Jumper (Relay in UK) Peugeot J5 (Talbot Express in UK) Peugeot Boxer

FSO Polonez/Caro Honda Concerto (badge engineered Rover 200 diesel for European market) Hyundai Lantra Lada Niva LDV 200/Pilot Peugeot 205 Peugeot 305 Peugeot 306 Peugeot 309 Peugeot 405 Peugeot 406 Peugeot 605 Peugeot Partner Suzuki Baleno Suzuki Samurai (Santana) Suzuki Vitara (Santana) Talbot Horizon Tata Telcoline / Tata Telcosport Rover 200 Rover 400 Toyota Corolla UMM Alter 2000

References

Guide des moteurs Peugeot Citroën (in French)

fr:XU (moteur)