What are the common reasons for a loud knocking noise in an Audi 80 engine?

I've been hearing a loud knocking noise in my Audi 80 engine and I'm wondering what the possible causes could be. I want to make sure it's something I can easily fix myself or if I need to take it to a mechanic.

The most common reason for a loud knocking noise in an Audi 80 engine is a worn or damaged connecting rod bearing. This can occur due to normal wear and tear or from insufficient lubrication. It's recommended to take your car to a mechanic to replace the faulty bearing and prevent further damage to your engine.

Another possible cause of a loud knocking noise in an Audi 80 engine could be a loose or damaged flywheel. This can happen if the flywheel bolts become loose or if the teeth on the flywheel become damaged. It's important to have a mechanic check and replace the flywheel if necessary to avoid potential engine failure.

In some cases, a faulty lifter or valve can also cause a loud knocking noise in an Audi 80 engine. This can happen if the lifter becomes stuck or if the valve is not functioning properly. A mechanic will be able to diagnose the issue and recommend the necessary repairs.