Engine marking and release date | AAE since 11/90 | AAD up to 6/92 | AVK since 7/92 | AAR since 12/90 | ABC since 5/92 | AAN S 12/90 |
Number of cylinders | 4 | 4 | 4 | 5 | 6 | 6 |
power, kWt (l. With.) | 74 (101) | 85 (115) | 85 (115) | 98 (133) | 110 (150) | 128 (174) |
At rpm | 5500 | 5400 | 5400 | 5500 | 5750 | 5500 |
Volume, cm3 | 1984 | 1984 | 1984 | 2309 | 2598 | 2771 |
Combustible mixture preparation | Mono-Motronic | KE-Motronic | Digifant | KE-III-Jetronic | MPFI | MPI |
4 cylinder engine
Originally designed for the Audi-80, this motor is also used for the Audi-100 and Volkswagen models Golf And Passat. Its most important design features: 4-cylinder engine with an overhead camshaft. The valves are driven by hydraulic poppets. The intermediate shaft drives the oil pump and ignition distributor. The camshaft and intermediate shaft are driven by a toothed belt.
4-cylinder engine in section:
1 - oil filler neck;
2 - camshaft gear;
3 — a casing of a gear driving belt;
4 - tensioner gear drive belt;
5 - toothed drive belt;
6 - V-belts;
7 - gear wheel of the intermediate shaft (ignition distributor and oil pump drive);
8 - V-belt pulley of the crankshaft;
9 - V-belt pulley of the water pump;
10 - oil pan;
11 - piston;
12 - thermostat;
13 - intermediate shaft;
14 - crankshaft with counterweights;
15 - oil pump;
16 - drive shaft for the oil pump and ignition distributor;
17 - oil filter;
18 - connecting rod;
19 - fuel pump;
20 - ignition distributor;
21 - inlet valve 3 cylinders;
22 - spark plug;
23 — hydraulic pusher with valve springs;
24 - camshaft;
25 - crankcase ventilation.
5 cylinder engine
The main design features of the 4-cylinder engine are similar to the 5-cylinder engine introduced for the first time in 1976 on the Audi-100. Suffice it to mention just two common features - this engine also has a toothed belt to drive the camshaft and coolant pump, and this engine uses poppet hydraulic tappets to actuate the valves.
The design of the crankshaft of a 5-cylinder engine is especially interesting: the connecting rod journals of the crankshaft are at an angle of 72 with respect to each other, for each cylinder there are two counterweights on the shaft. Further: a specially organized flywheel imbalance and also a damper at the front end of the crankshaft serve to absorb torsional vibrations.
5-cylinder engine in section:
1 - piston;
2 - valve;
3 — hydraulic pushers;
4 - toothed pulley of the camshaft belt;
5 - camshaft;
6 - cylinder head;
7 - engine block;
8 - oil pan;
9 - crankshaft;
10 - inlet pipe of the oil pump;
11 - oil pump;
12 - toothed pulley of the crankshaft belt;
13 - V-belt pulley with a damper on the crankshaft.
6-cylinder engine
Newly developed for the introduction of the fourth generation of the Audi-100 in 1991, the 6-cylinder V-twin engine is a very compact unit, specially designed for a longitudinal arrangement. Two overhead camshafts actuated by toothed belts actuate the valves by means of poppets. An exhaust gas line is located in the space between the cylinder heads. The 2.8-litre version is equipped with a variable length intake manifold that changes the active length of the intake ports depending on the speed range. In this way, optimum engine torque is achieved in all speed ranges. It is also worth mentioning the distributorless ignition system, which is described in more detail in the chapter «Ignition system».
6-cylinder engine in section:
1 - inlet gas pipeline;
2 - a package of ignition coils;
3 - toothed belt;
4 - V-ribbed belt;
5 - a pulley with a damper on the crankshaft;
6 - oil pump;
7 - inlet pipe of the oil pump;
8 - crankshaft;
9 - connecting rod;
10 - piston;
11 — hydraulic pushers;
12 - valve;
13 - camshaft.
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