Audi A4

Since 1994 of release

Repair and car operation

The four-cylinder engine

The beginning of our four-cylinder engine is necessary in 1972 when Audi has put a basis of present position in the market, having presented new model Audi 80. Professionals then have admired not only a body and a running gear, but also the new engine. Its major constructive signs: the four-cylinder engine with the cam-shaft located from above, valves are put in action тарелочными by pushers. At the oil pump and the distributor a drive from an intermediate shaft. The drive of a cam-shaft and an intermediate shaft is carried out by means of a gear belt.

From the former engine remains a little, but nevertheless the basic lines кривошипного the mechanism remained former. Specially for application in Audi A4 basic changes are made to a head of the block of cylinders: the engine with working volume 1,6 l for gas exchange improvement has received a so-called head with a cross-section stream of gases. Fresh gases arrive on the left side of the engine, and fulfilled are issued on the right side. In addition new engine in 1,6 l has received very long inlet pipelines for maintenance of the maximum traction effort (the maximum twisting moment) in the bottom range of turns.

The similar purpose was pursued in a design пятиклапанных heads. Here for the account большего sections of a stream which five valves allow to receive, gas exchange in a wide range of turns of the engine also improves.

The turbo-supercharging in 1,8 Т creates a powerful twisting moment on the lowest turns. Capacity which usually is expected only for much higher classes of working volumes is created.

As a whole all four-cylinder engines create conditions for a weakening trip, the capacity palette is extremely convincing on all range of turns. Thus the fuel expense remains at pleasantly low level at the expense of small working volume.

The six-cylinder engine

The new six-cylinder engine developed in 1991 for representation of last generation Audi 100, represents very compact power-plant and as if it is created for installation typical in models Audi lengthways before a forward axis. Two cam-shafts located from above with drives from gear belts operate valves by means of тарелочных pushers. In space between heads of cylinders the inlet collector takes places. The version with working volume of the engine 2,8 l is supplied by a switched inlet collector which changes active length of inlet channels depending on a range of turns of the engine. Thus, the optimum twisting moment of the engine in all ranges of turns is reached.

For Audi A4 the six-cylinder engine has been supplied by new system of circulation of oil and new, three-section картером. The system of circulation of oil is designed in such a manner that pressure of oil is regulated after the oil filter and an oil radiator.

Thanks to it in greasing places that pressure which creates the adjusting valve is created.