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V8 & V8 BiT - (4.2 V8 ja 4.2 V8 BiT)
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[quote][i]Algselt postitas: end3l[/i] Vana teema või mitte, aga foorumisse veits infot v8 listist PT ja ABH kohta. Dear list, as a follow-up on our discussion two years ago regarding the "real" cylinder coating and/or block alloy in the Audi V8 engines PT (3,6) and ABH (4,2) I can now provide you with some new details and - finally - facts. As you may know there were always rumours going on that the ABH blocks may be NiKaSil coated which shall explain the large oil consumption of some 4,2 V8s, even though it didn't make a lot of sense. We now have the results from the spectral analysis of both the ABH and the PT blocks and they are as follows: 1) PT and ABH are made of completely identical alloys 2) Both blocks are AlSiCu alloys 3) Both blocks have etched cylinder walls 4) The common name of the alloy is G-AlSi12 and is a "standard material" for strong requirements on solidity and strength - a typical alloy for combustion engines 5) Additionally vestiges of iron ( Fe, approx 0,67%) have been detected, supporting the solidity as stated as requirement in 4) For most of you all this is probably no surprise - but back in Europe this has busted a myth which was spread around since ages and caused numerous V8 owners to sell the car as they thought its engine is irrepealable broken (this includes myself). Still, the question is given why some ABH need more oil than fuel (>3 liters is not exceptional) even after the heads have been overhauled but it is at least proven that it's not cause Audi has used NiKaSil for some strange reason on this and only this engine... siin on alusili kohta infot tootja poolt: For all those interested here are two links to the main vendor of the Audi V8 engines. If you dig around (things keep moving) their site you can find all manner of technical information on the aluminum casting process and other information. Look for the service sections. KS Aluminium-Technologie AG http://www.kspg-ag.de/index.php?fid=111&lang=2 http://www.kspg-ag.de/index.php?fid=1299&lang=3 eriti viimasel lingil. Mõlemat linki saab inglisekeelseks ka muuta alt vasakult. [/quote]
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Eesti Audi Klubi foorum
»
S - Audid
»
V8 & V8 BiT - (4.2 V8 ja 4.2 V8 BiT)
»
4.2 mootorite erinevus
» Vasta
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