The 2.0-liter 5-cylinder Audi CN diesel engine was produced from 1978 to 1988 and was installed in the second and third generations of the rather popular Audi 100 model. This diesel engine had a supercharged DE modification, as well as an NC version with a turbine and intercooler.
EA381 family: 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:
Disadvantages of the Audi CN engine
- This is a simple and reliable atmospheric diesel engine and all its problems from old age.
- The most common problem is high pressure fuel pump leaks due to wear of its gaskets.
- Monitor the condition of the timing belt, as with its breakage, the valves always bend.
- At high mileage, these engines often experience lubricant consumption.
- With regular overheating, the cylinder head may crack and it is not easy to find another.
Frequently asked questions about the Audi CN
How much power does the Audi CN make?
The Audi CN develops 69 hp and 123 Nm of torque.
How much oil does the Audi CN take and which one?
Engine oil capacity: 5.0 liters. Recommended oil: 5W-40.
Does the Audi CN have a timing belt or chain?
The Audi CN uses a timing belt.
Is the Audi CN turbocharged?
No, the Audi CN is naturally aspirated.
Does the Audi CN need valve clearance adjustment?
Yes, there are no hydraulic lifters, so the valve clearances have to be checked and adjusted periodically.
How long does the Audi CN last?
The typical lifespan of the Audi CN is ~300 000 km with proper maintenance.
What is the fuel consumption of the Audi CN?
Audi 100 1983: city 9.3, highway 5.2, combined 7.0 L/100 km.
What cars was the Audi CN installed on?
Audi 100 C2 (43) in 1978 - 1982; Audi 100 C3 (44) in 1982 - 1988.
What are the common problems of the Audi CN?
This is a simple and reliable atmospheric diesel engine and all its problems from old age. The most common problem is high pressure fuel pump leaks due to wear of its gaskets. All known problems.
