forum.audiv8.com Foren English Audi V8 Forum ABH versus AEC

Firstly, greatings from a new member.

I own a 100 S4 with a V8 engine ABH. Unfortunately, the engine is damaged, burning a lot of oil. Redoing the engine will be probably costly and I'm actually looking replacing it. I eventually found an AEC V8 (for A6, year 96) and I was wondering what would be the differences between an AEC and ABH. In fewer words, would it fit directly ?

Thanks for your advices.

Hello. Mechanically both engines seems absolutely identical. Differeces are between electronics - ECU on ABH is not identical, as in AEC, and it's possible to get some troubles due to fact, that - for example - AEC has no line for "check engine" lamp on instrument panel, but - different, than ABH - it's ECU communicates itself with auto gearbox (in triangle with instrument cluster).

So my advice is to unscrew Your wounded ABH, but leave complete engine wiring under bonnet, and original ABH ECU under panel (maybe better, because pulling it through front wall drives mechanic crazy and develops bald spots, when You're checking, how many time it takes!). Putting a new-old AEC and connecting it to Your stock wiring will give You result of having normal ABH.
Not 100% sure, but may be a little difference in comparsion with "original" ABH - AEC may have a little hotter cams, but I doubt it will cause any - even small - troubles.

Good luck
Sebastian

Hello,
I will definitely not be able to help you, but from what I have read in the german section of this forum, Frank Konnopasch is just the kind of authority to be able to do so.
Only, I do not know his english abilities. Let us see if there come any other reactions, otherwise, if you want, I can translate your question and put it in the german section.
This is the only way I may be of any help.
By the way Alain, from where are you ?
Regards, Eric

Alain,
Are you really interested in me putting your question in the German section? Are you from France? Or Switzerland? Or what?
regards, Eric