Audi S6 c4 V8 AEC Hohenester Biturbo

Hello to the round,

I am Martin and I bought an Audi S6 c4 V8 with registered Hohenester Biturbo conversion.

However, due to fire problems at the beginning of the 2000s, the car was rebuilt and driven only as a normal V8. Now I bought the car and want to convert it back to biturbo and yes I know the fun costs good money.

I'm just trying to pick out the basic engine. The AEC is still installed and is driving, but it has problems on the 4 cylinder where only 1bar compression is required where I don't know exactly what exactly the reason is, whether valves, head gasket or piston rings.

My question would be what would you take as the basic basis for an engine, to choose from the 3.6 PT or stop the original AEC.

With the PT the advantage is that you can take the parts there like pistons and conrods either from S2 or RS2 or also 1.8 16v because the parts are basically the same.
However, I would have to buy a PT first, which then raises the question again how the remaining components from the engine fit to the PT. Such things as swing and clutch on the 6speed gearbox, the crackers have the same shots on the head.

Or I take the AEC which then needs to be overhauled, only there I do not know which things like pistons and conrods fit into this engine, although in the end it is only about the conrods, because according to statements from Hohenester they probably still have pistons in stock, and the scrambles for this conversion have still there.

How would you do in my place, I would be happy about tips and tricks.


Sunny greeting

Martin