[V8] Spectral analysis V8 ABH and PT blocks

[D Morralee]

thanks Bastian for taking the time to research and post this interesting info . cheers superdave 

 

 
> Date: Fri, 11 Dec 2009 13:10:47 +0100
> From: bastian at preindl.net
> To: v8 at audifans.com; 200q20v at audifans.com
> Subject: [V8] Spectral analysis V8 ABH and PT blocks
> 
> 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...
> 
> Credits to Manfred M. from Augsburg for his efforts!
> 
> Best regards
> 
> Bastian
> 
> PS.: I've sent this also to the 200Q list as this might interest future 
> and past V8 owners as well and the V8 is usually also a lively topic in 
> the 200Q circles
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