There seems to be some similarity between Mercedes and Audi engines. The question is how to interpret this... For example: in the case of aluminium or the coating of the pistons. Last night Bernard gave a crash course in it. He looked at my new grinder, the rusty 4.2 engine block and the used pistons/pleul etc.
I couldn't follow that... But by google you can find a lot of things, for example. the
http://www.w140forum.de/showthread.php?5653-Build-One-New V12-Brabus 7.4-S-Motor (Search word Bernard Brabus V12)
Bernard mainly deals with the Brabus engines... And there with the V12.
If I understand him correctly, then the "normal" engine repairers usually don't have the options here for drilling and honing. Oh, yes. Well, it's clear that we don't have Nikasil blocks. I don't think there's anything going on. With Alusil a lot is possible after all.
Experience with Alusil is very important here. Well... He then lets the professionals do his things at Brabus, for example. the drilling / honing / lapping.
Of course, I asked what this is like with our V8 with the oil consumption. I was trying to tell you what kind of trouble we're having.
His answer went towards oil on one hand... so NO mineral take as this rather kokt the piston rings. He recommended an oil... I just don't think I'm gonna get any viscosity.
The story with the differences of AEC and ABH he expressed the assumption that perhaps tolerances were changed. Speak piston and cylinder walls somehow better fit together.
The point in which he sees the main problem is the piston rings. This could be the problem and its lösuing.
Does anyone have the opportunity to see how far the distance of the plunger rings is when the pistons are in? Newly made piston / oil stripping rings that have the right tolerances should be able to solve the problem.
The other possibility would be excess pistons. Of course, these would have to be made. But only from Mahle / Piston Schmidt, since the coating is only patented by the two companies. However, this coating of the aluminium pistons is essential for durability. He saw my open block. I pointed out the thickness of the cylinder walls. He was of the opinion that a small reduction is possible here. Thus drilling and honing would be possible. He was a little surprised when I said that Audi has no oversized pistons available. There are probably two repair stages for Mercedes. Working with any steel bushings he excludes. Such experiments have probably already been made and the materials probably would not have been suitable together. Of course, it is important that the cylinder walls do not see and feelable bars etc. The
I'm sorry if I tried to explain some things in my words... but that was last night half / three quarters hour in the dark at the Contikreisel at the Hockenheimring... And I may not have gotten everything together as Bernard explained as a professional.
The fact is, for me... our ABH are not lost yet!!!
I'll see if I can keep in touch with him, and if a few people are interested in a proper engine repair... we might be able to move on in the long term.
Remember that the S6 / AEC are finally...
Frank
das mit dem Stossspiel usw. scheint ein interessanter Ansatzpunkt zu sein.