Audi AAD engine
Content
For the Audi 90 and Audi 80 models popular in the 100s, a “named” power unit was created, which expanded the line of Volkswagen engines EA827-2,0 (2E, AAE, ABF, ABK, ABT, ACE, ADY, AGG).
Description
In 1990, specialists from the VAG auto concern developed and put into production another internal combustion engine for the Audi 80 and 100, which received the factory code AAD. The production of the motor was carried out until 1993 inclusive.
The new engine had many positive qualities, but the use of the KE-Motronic ignition / fuel injection system with self-diagnosis and knock control did not play a plausible role. Thanks to KE-Motronic, many car enthusiasts find the AAD moody.
Changes received timing drive and CPG. Now, when the drive belt breaks, the valves meet with the piston are practically excluded.
The Audi AAD engine is a 2,0-liter in-line four-cylinder petrol engine with a capacity of 115 hp. with and a torque of 168 Nm.
Installed on the following Audi models:
- 80 B3 /8A, B3/ (1990-1991);
- 100 Avant C4 /4A_/ (1990-1993);
- 100 sedan /4A, S4/ (1990-1992);
- Cup 89 /8B/ (1990-1993).
By design, AAD has much in common with the VW 2E engine, widely known to our motorist.
There is practically no difference in the arrangement of the cylinder block, CPG and timing (with the exception of the location in the engine compartment).
The differences lie in the engine management systems. AAD uses KE-Motronic ECMS. Spark plugs Champion N7BYC.
In the timing drive, the manufacturer recommends replacing the belt after 90 thousand km, but in our operating conditions it is advisable to do this operation earlier, after about 60-70 thousand km of run.
In the vast majority of cases, the valves remain intact when the belt breaks, there is no bending. But deviations in this matter are possible.
In the lubrication system during the production years of the Audi 100, Volkswagen branded engine oil with a tolerance of 500/501 was relevant. To date, tolerances 502.00/505.00 and 504/507 apply. For all-weather conditions and year-round use, SAE 10W-40, 10W-30 or 5W-40 is recommended. System capacity 3,0 liters.
Fuel supply system mechanical injector.
The manufacturer recommends using AI-95 gasoline. The system is sensitive to fuel quality. Many motorists replace the mechanical injector with an electronic one.
Technical specifications
| Manufacturer | car concern VAG |
| Release year | 1990 |
| Volume, cm³ | 1984 |
| Power, hp from | 115 |
| Power index, l. s/1 liter volume | 56 |
| Torque, Nm | 168 |
| Compression ratio | 10.4 |
| Cylinder block | cast iron |
| Number of cylinders | 4 |
| Cylinder head | aluminum |
| The working volume of the combustion chamber, cm³ | 53.91 |
| Fuel injection order | 1-3-4-2 |
| Cylinder diameter, mm | 82.5 |
| The piston stroke, mm | 92.8 |
| Timing drive | belt |
| Number of valves per cylinder | 2 (SOHC) |
| Turbocharging | no |
| Hydraulic compensators | Yes |
| Camshaft adjuster | no |
| Lubrication system capacity, l | 3 |
| Applied oil | 5W-30 |
| Oil consumption (calculated), l / 1000 km | to 1,0 |
| Fuel system | mechanical injector |
| Fuel | gasoline AI-95 |
| Environmental standards | Euro 2 |
| Resource, outside. km | 320 |
| Start-Stop system | no |
| Location | longitudinal |
| Tuning (potential), l. With | 190 + * |
*safe increase in power up to 125 hp. With
Reliability, weaknesses, maintainability
Reliability
An AAD engine is considered reliable if it is serviced well and on time. Subject to this requirement, its resource is up to 450 thousand km without major repairs.
Car owners in their reviews speak out about this unambiguously. For example, Farike from Uralsk writes: “… the engine is simple and reliable". At the same time, the not quite adequate operation of the fuel injection system is emphasized.
The margin of safety allows you to boost the internal combustion engine up to 190 liters. forces. At the same time, it must be borne in mind that such a motor will work on the strength of 40 thousand km, or even less. The most unpleasant thing is that after such a run it will not be possible to restore its performance.
The only painless option for increasing the power of the unit is chip tuning. This operation will add about 10-12 hp to the engine. s, which will be hardly noticeable against the general background. At the same time, high-quality chip tuning will reduce fuel consumption and increase the ease of engine control (more precise response to the fuel pedal, elimination of failures during acceleration, etc.).
Weak spots
The KE-Motronic injection system delivers the most trouble in the engine. At the same time, a number of car owners note that it can also work correctly. So, Fazanis from Tyumen writes: “... injection is not very capricious if it is not started and filters are changed in time».
The correctness of his statement is confirmed by Aptekari from Balti: “... if you follow it (injection), then it is quite reliable. Requires high-quality fuel and frequent replacement of the fuel filter».
The timing belt does not have a long resource. It is recommended to replace it after 60-70 thousand kilometers.
Elements of the ignition system and KSUD require increased attention. Their failure is possible at any mileage.
The occurrence of other malfunctions is associated with the natural wear of parts and assemblies of the unit. For example, with a significant mileage, hydraulic compensators may fail, all kinds of leaks and leaks may appear in places of seals.
Maintainability
The Audi AAD engine is simple in design, so many motorists make repairs without contacting car service specialists. The cast-iron block allows you to repeatedly bore the cylinders to the required repair size.
Purchasing the right parts is no problem. Some car owners buy them at showrooms (much cheaper!).
During repairs, some motorists replace some internal combustion engine components with more progressive and cheaper ones. For example, a mechanical injector is changed to an electric one using components from the VAZ 2110. Or, as Pol022 writes from Balashikha: “... pipes, especially those on the stove, from the GAZelle are suitable».
There is only one conclusion: AAD maintainability is high.
Sometimes motorists choose the option of replacing the engine with a contract one. Xitroman (Saratov region) justifies this as follows: “… if you capitalize according to all the rules – at least 2…3 prices of the contract engine. Surely only new pistons with rings will pull in money, like a contract engine».
The price of a contract engine, depending on the configuration with attachments, starts from 25 thousand rubles.
