The second and third generations of the popular Audi 100 model were equipped with the 2.0-liter, five-cylinder Audi CN diesel engine, which was manufactured between 1978 and 1988. Both an NC version with a turbine and intercooler and a supercharged DE modification were available for this diesel engine.
The EA381 series also includes: CN, AAS, AAT, 1T, AEL, AHD, BJK, BJM.
Specifications
| Production years | 1978-1988 |
| Displacement, cc | 1986 |
| Fuel system | prechambers |
| Power output, hp | 69 |
| Torque output, Nm | 123 |
| Cylinder block | cast iron R5 |
| Block head | aluminum 10v |
| Cylinder bore, mm | 76.5 |
| Piston stroke, mm | 86.4 |
| Compression ratio | 23.0 |
| Features | SOHC |
| Hydraulic lifters | no |
| Timing drive | belt |
| Phase regulator | no |
| Turbocharging | no |
| Recommended engine oil | 5W-40 |
| Engine oil capacity, liter | 5.0 |
| Fuel type | diesel |
| Euro standards | EURO 1 |
| Fuel consumption, L/100 km (for Audi 100 1983) — city — highway — combined |
9.3 5.2 7.0 |
| Engine lifespan, km | ~300 000 |
The engine was installed on:
- Audi 100 C2 (43) in 1978 – 1982;
- Audi 100 C3 (44) in 1982 – 1988.
Disadvantages of the Audi CN engine
This is a straightforward, dependable atmospheric diesel engine with all of its aging-related issues.
Leaks from high pressure fuel pumps caused by gasket wear are the most frequent issue.
Keep an eye on the timing belt’s condition because when it breaks, the valves always bend.
These engines frequently experience lubricant consumption at high mileage.
Regular overheating can cause the cylinder head to crack, and replacing it is difficult.