The pjatiklapannyj engine is supplied by two cam-shafts located from above from which one puts in action three inlet valves while another opens both final valves. Capacity of the engine along with various parametres, for example working volume and number of turns, appreciably depends on that, gas exchange how fast can be carried out. The more fresh gas for the same time unit can get to the combustion chamber, the more intensively a capacity exit. The majority of engines Audi has a long course, it means that a piston stroke more than diameter of the cylinder. Engines with a long course allow to create short designs, they it is easier than engines with a short course, possess smoothness in work, especially idling, and differ, first of all, that already on low turns reach the maximum twisting moment. Filling of the chamber of combustion depends, first of all, on opening and closed valves and sections through passage in valves and channels of a head of the block of cylinders. Three inlet and two final valves, i.e. In the sum five on each cylinder, provide the maximum section through passage. It follows from the area of a plate of the valve and size of a course of its opening. In comparison with extended многоклапанными concepts пятиклапанная the technology in engines with a long course offers the greatest possible advantages from the point of view of intensity of filling of cylinders. Simultaneously the technology Five valve the engine supposes the form of the chamber of combustion with the central arrangement of a spark plug, and at the expense of it the short way of a spark of ignition for maintenance of fast, effective combustion of a working mix is possible. Also danger of a detonation thus decreases, and at the expense of a high compression there is possible a fuel heavy use. Combustion of a working mix in пятиклапанном the engine is carried out "more softly", than in two- and четырехклапанных engines. As because of большего cross-section section of valves the forces putting them in action, much more poorly as a whole at work Five valve the engine pleasant acoustics is created. Five valves are put in action by two cam-shafts directly by means of hydraulic тарелочных pushers. As for a long time it is accepted in Audi, the backlash of valves is not regulated. The inlet cam-shaft serves on three valves on each cylinder, a final cam-shaft – on two. Both cam-shafts are connected among themselves by means of a chain, the drive from коленвала is provided with a gear belt. Philosophy of adjustment of the engine The high density of traffic in our streets demands other concept of the engine different from those that existed in 80th: the size of the maximum capacity, and equation of the expense of fuel, assortment of offered capacities, character of the fulfilled gases and noise is in demand not.
