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B. Reged: 18/08/2002 Posts: 13274 Loc: Österreich (Graz) Re: FAKTEN [re: Bastian Preindl]       01/09/2008 16:10 Edit   Reply   > >Hi, > > > >finally I got some "official" information concerning the ABH: > > > >The internal product information for the introduction of the V8 4.2 > >(10/91) says: > > > >"The engine block is made of an aluminium alloy with 17% silicon > >contingent. In a special etch process the hard silicium cores are > >exposed, which form the piston contact surface. Usual piston liners are > >therefore needless. > > > >The light alloy pistons have galvanically applied iron coatings with a > >flimsy tin film on it. Benefit: Highest friction resistance." > > > >The press map of 12/1991 says the same thing. > > > >So, what is it? > > Alumsil - The piston coatings are identical to the Porsche and GM ( Vega) engine technologies of that era- that's why Audi used similar techniques- it was well proven by the late '80's. These engines need really GOOD quality rings to withstand the abrasive nature of the silicon that is left in the bores. Also the break-in procedure is critical to seat the rings ( see the Porsche 928 shop manuals for one such procedure) In the original designs (circa 1972-1980) iron coatings ( over alum pistons) was the preferred method to insure that the piston skirts would also survive the rigors of the silicon bores. One cause of high oil consumption in these engines can be due to poor rings and/or bad break-in procedures. Also heavy piston side loads can really screw up the ring/bore surfaces. Modern plasma coatings can also withstand the silicon bores but they are more costly than the iron coatings. I've been racing and/or rebuilding alumsil engines for over 30 years ( ran 200 hp Vega and 450 hp 928 engines) so I'm more than a little familiar with the technologies. Das Buch zum Audi V8 Post Extras

Entire thread Subject Posted by Posted on PT u. ABH Zylinderbeschichtung - Dokumentiert? Bastian P. 26/08/2008 09:41 Re: PT u. ABH Zylinderbeschichtung - Dokumentiert? Sebastian Obermüller   26/08/2008 10:30 Re: PT u. ABH Zylinderbeschichtung - Dokumentiert? Bastian P.   26/08/2008 16:22 Re: PT u. ABH Zylinderbeschichtung - Dokumentiert? Sebastian Obermüller   26/08/2008 16:30 Re: PT u. ABH Zylinderbeschichtung - Dokumentiert? Bastian P.   26/08/2008 16:36 Re: PT u. ABH Zylinderbeschichtung - Dokumentiert? Sebastian Obermüller   26/08/2008 16:48 Re: PT u. ABH Zylinderbeschichtung - Dokumentiert? Bastian P.   26/08/2008 16:51 Re: PT u. ABH Zylinderbeschichtung - Dokumentiert? Rainer Hüring   26/08/2008 16:59 Re: PT u. ABH Zylinderbeschichtung - Dokumentiert? Bastian P.   26/08/2008 23:32 Re: PT u. ABH Zylinderbeschichtung - Dokumentiert? Bastian P.   27/08/2008 10:00 Re: PT u. ABH Zylinderbeschichtung - Dokumentiert? Frank Ha.   27/08/2008 10:10 Re: PT u. ABH Zylinderbeschichtung - Dokumentiert? Bastian P.   27/08/2008 10:14 Re: PT u. ABH Zylinderbeschichtung - Dokumentiert? Roy F   27/08/2008 17:24 Re: PT u. ABH Zylinderbeschichtung - Dokumentiert? Bastian P.   28/08/2008 10:03 Re: PT u. ABH Zylinderbeschichtung - Dokumentiert? Roy F   28/08/2008 20:45 Re: PT u. ABH Zylinderbeschichtung - Dokumentiert? Bastian P.   01/09/2008 10:07 Re: PT u. ABH Zylinderbeschichtung - Dokumentiert? Roy F   01/09/2008 18:34 Re: PT u. ABH Zylinderbeschichtung - Dokumentiert? Bastian P.   01/09/2008 19:18 Re: PT u. ABH Zylinderbeschichtung - Dokumentiert? Roy F   01/09/2008 19:22 Re: PT u. ABH Zylinderbeschichtung - Dokumentiert? Bastian P.   01/09/2008 19:42 Re: PT u. ABH Zylinderbeschichtung - Dokumentiert? Roy F   01/09/2008 19:50 Re: PT u. ABH Zylinderbeschichtung - Dokumentiert? Sebastian Obermüller   26/08/2008 16:46 Re: FAKTEN Kai E.   27/08/2008 18:17 Re: FAKTEN Bastian P.   28/08/2008 12:03 Re: FAKTEN Bastian P.   28/08/2008 10:04 Re: FAKTEN Frank Freiberg   28/08/2008 13:17 Re: FAKTEN Frank Freiberg   01/09/2008 14:45 Re: FAKTEN Bastian P.   01/09/2008 16:10 Re: FAKTEN Bastian P.   01/09/2008 16:23 Re: FAKTEN Daniel Müller   02/09/2008 12:26 Re: FAKTEN Bastian P.   02/09/2008 12:28 Re: FAKTEN Daniel Müller   02/09/2008 12:49 Re: FAKTEN Daniel Müller   03/09/2008 12:54 Re: FAKTEN Frank Freiberg   02/09/2008 12:52 Re: FAKTEN Rainer Hüring   02/09/2008 17:59 Re: FAKTEN Bastian P.   02/09/2008 19:22 Re: FAKTEN Manfred M.   03/09/2008 13:11 Re: FAKTEN Bastian P.   25/09/2008 10:51 Re: FAKTEN Manfred M.   30/09/2008 09:40 Re: FAKTEN Bastian P.   14/10/2008 00:06 Re: FAKTEN Manfred M.   14/10/2008 09:41 Re: FAKTEN Jürgen Sch.   14/10/2008 16:53 Re: FAKTEN Manfred M.   15/10/2008 06:43 Re: FAKTEN Jürgen Sch.   15/10/2008 12:37 Re: FAKTEN Manfred M.   15/10/2008 13:50 Re: FAKTEN BerndT   15/10/2008 23:58 Re: FAKTEN Armin W.   25/09/2009 17:27 Re: FAKTEN Manfred M.   25/09/2009 21:32 Re: FAKTEN Armin W.   25/09/2009 23:37 Re: FAKTEN Roy F   26/09/2009 01:58 Re: FAKTEN Roy F   25/09/2009 18:10 Re: FAKTEN Armin W.   25/09/2009 23:39 Re: FAKTEN Daniel Müller   14/10/2008 16:14 Re: FAKTEN Bastian P.   14/10/2008 09:46 Re: FAKTEN Bastian Kaps   14/10/2008 12:17 Re: FAKTEN Mario M.   14/10/2008 12:46 Re: FAKTEN Bastian Kaps   14/10/2008 12:57 Re: FAKTEN Mario M.   14/10/2008 17:21 Re: FAKTEN Bastian Kaps   14/10/2008 17:23 Re: FAKTEN Mario M.   14/10/2008 17:26 Re: FAKTEN Bastian Kaps   14/10/2008 17:53 Re: FAKTEN Mario M.   15/10/2008 08:47 Re: FAKTEN Uwe Hoelzer   14/10/2008 18:29 Re: FAKTEN Manfred M.   25/09/2008 19:47 Re: FAKTEN Bastian P.   25/09/2008 20:14 Re: FAKTEN Mario M.   03/09/2008 09:37 Re: FAKTEN Bastian P.   03/09/2008 10:10 Re: FAKTEN Mario M.   03/09/2008 10:40 Re: FAKTEN Christian Gerbig   03/09/2008 10:43 Re: FAKTEN Mario M.   03/09/2008 10:46 Re: FAKTEN Bastian P.   01/09/2008 16:19 Re: FAKTEN Bastian P.   01/09/2008 16:16 Re: FAKTEN Bastian P.   01/09/2008 16:16 Re: FAKTEN Bastian P.   01/09/2008 16:13 Re: FAKTEN Bastian P.   01/09/2008 16:12 Re: FAKTEN Bastian P.   01/09/2008 16:11 Re: FAKTEN Bastian P.   01/09/2008 16:10

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