Audi 100/A6

1990-1997 of release

Repair and car operation

Modern diesel cars are attractive by the ability to develop big force of draft on small turns, than are especially good for the drivers who are not liking too often to switch transfers. The majority of manufacturers is offered by diesel engines with a turbo-supercharging to give the chance to the owner to feel most all charm of the high-class car.

If you think of transition to a diesel engine, but do not know how to look after him the hands, at once we will tell what to support a diesel engine in a good condition it is absolutely not more difficult than the petrol engine, despite their distinctions. We offer you the short guide to purchase, operation and diesel engine service.

Mechanisms of the petrol and diesel engine a little than differ. The four-cycle cycle of burning of fuel is put in a basis of operation of both engines, but there is it at them in absolutely different ways.

While at petrol engines the toplivovozdushny mix ignites spark plugs, diesel fuel ignites as a result of very strong compression.

When the petrol engine soaks up air and gasoline on the first step, the diesel engine sucks in only air which is compressed to such an extent that its temperature rises to 800 ° Page. The heated air sets fire to diesel fuel which is injected into the chamber of combustion of the cylinder shortly before the piston reaches BMT on a compression step. As extent of compression at diesel engines is twice higher, than at petrol engines, injection of fuel should occur under very high pressure that it flew in the combustion chamber, and the stream of fuel kept formed it. Owing to an increased requirement to injection, the fuel pump of a high pressure of a diesel engine is especially vysokotochno the produced knot.

On old models of diesel engines ryadny mnogoplunzherny fuel pumps of a high pressure were usually used. Now on the majority of modern diesel engines apply more difficult rotor pumps with continuous supply of fuel as they work at high turns of the engine better. In modern diesel engines electronic control systems of dispensing of supply of fuel for achievement of course of process of combustion close to the ideal are used. Many diesel engines even are equipped with converters for purification of exhaust gases.

There are two types of diesel engines, and distinction between them consists in how in them there is a fuel combustion. In one direct injection of fuel is used. The name indicates the direct direction of fuel in a cavity of the chamber of combustion. Though this method of injection is very effective, its negative sides are strong noise and unevenness. For this reason direct injection remained only on the diesel engines used by lorries. However on diesel engines of advanced designs these shortcomings are considerably eliminated, and the majority of producers of cars is offered by highly effective diesel engines with direct injection.

In other diesel engines which are not using direct injection of fuel, in front of the chamber of combustion create the small additional chamber in which there is a fuel injection. Have this chamber on the opposite party from an installation site of a nozzle and the direction of movement of fuel injected by it. This constructive method allows to lift engine turns, but to pay for it it is necessary some loss of capacity.