PSA XUD – Wikipedia, the free encyclopedia

28 Jun 2014 | Author: | Comments Off on PSA XUD – Wikipedia, the free encyclopedia
Citroen BX 16

PSA XUD

Contents

Design [ edit ]

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. [ 1 ]

Displacement ranges between 1,769 and 2,138#160;cc, and all XU diesel engines have a stroke of either 88#160;mm (3.5#160;in) or 92#160;mm (3.6#160;in). The former was shared with the XU9. Bore sizes range from 80#160;mm (3.1#160;in) to 86#160;mm (3.4#160;in), some of which are 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. [ 1 ] It was also particularly light, with a ready-to-run XUD9 weighing 157#160;kg (346#160;lb), 15% less than a comparable diesel of the previous generation. [ 1 ] However, if the cooling system is neglected or improperly bled after filling – needing a raised filling level because the expansion tank is not the highest point in the system – the engine has a tendency to blow its head gasket.

A simple solution is to use a plastic soft drink bottle with the bottom removed, fitted with a rubber O ring seal on the flange at the cap end for filling. Because radiators (typical life 100,000 miles), generally have only just sufficient cooling capacity when new, in order to help get the engine to operating temperature quickly, silting causes significant problems. Coolant changes to maintain corrosion inhibitors (and stop silting) are critical on this engine.

Nonetheless due to the high volume of cars manufactured with this engine spare parts are plentiful and well priced.

Citroen BX 16

Vegetable oil fuel [ edit ]

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 ). 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 acting as a lubricant and increasing the workload on distributor/rotary injection pump and damaging it. The Lucas EPIC pump fitted to the 2.1#160;L 12 valve turbodiesel engine after 1995 is the weakest pump of all. [ 2 ] Different fresh vegetable oils have different viscosities: thinnest are; sunflower, rapeseed (often only labelled vegetable oil, but with pictures of distinctive yellow flowers), then soya and corn oil, but palm oil (often only marked vegetable oil) is thickest.

Vegetable oils thicken when used for cooking, so used oil can be much thicker than any fresh oil, they may even solidify at room temperature. Used oil needs to be very well filtered to avoid filter plugging and/or injection pump damage. Heavily used oil may be highly acidic and corrode the inside of the injection pump.

Such oil can only be used as fuel without the risk of damage, if it has been chemically processed into bio-diesel. The open market price for used oil often quite close to special offer supermarket prices for new oil, which can be used straight away. In order to reduce the viscosity of the SVO. it should be heated to engine coolant operating temperature, typically with a two tank system, in order to start and shutdown on diesel or bio-diesel.

Versions of this engine from the early ’90s onward, are typically fitted with a Peugeot-type coolant heated fuel filter that helps heat fuel and reduce viscosity. Fuel / engine coolant heat exchangers, usually required for straight vegetable oil conversions, are still needed for long term life expectancy, or there will be accelerated wear of the fuel injection pump. Heated vegetable oil is a good injection pump lubricant.

This is especially important in cold weather ambient temperatures. Mixing with major oil company brand diesel, to thin the vegetable oil fuel. choosing a thin vegetable oil, or electric heating, or a combination of these are helpful especially when starting and warming up, as coolant heating will not yet be at operating temperature. [ 3 ] The difference between the use of good quality fuel and supermarket diesel, in a diesel / vegetable oil fuel mix, will be very noticeable, especially at lower temperatures.

The fuel systems used on this engine return heated fuel to the fuel tank. Running with half a tank of fuel will allow the tank to be heated more effectively by this warmed fuel in low ambient temperatures.

XUD7 [ edit ]

The XUD7 has a displacement of 1.8#160;L (1,769#160;cc), with a bore of 80#160;mm (3.1#160;in) and a stroke of 88#160;mm (3.5#160;in). Output is 60#160;PS (59#160;hp/44#160;kW) for the naturally aspirated version or 78#160;PS (77#160;hp/57#160;kW) for the turbocharged model. An intercooled turbocharged version was introduced later, with 90#160;PS on tap.

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