[928uk] 928 cylinder block recoating with nicasil

[Paul R Smith in NZ]

As someone has already said, the 928 bores are not plated.
The document (which you may have seen now) which describes the refinishing
process, I believe, explains it.
The problem that I can see, is that the welding could alter the silicon
crystal distribution in the area of the weld.
You will need to find a welder who is familiar with the high silicon content
alloy, and someone with the experience and machinery to refinish the bores.
Or, fit liners.

Smiffy

----- Original Message ----- 
From: "paul greenwood" <paulgreenwood2 at hotmail.com>
To: <928uk at 928.org.uk>
Sent: Thursday, May 27, 2004 5:27 PM
Subject: [928uk] 928 cylinder block recoating with nicasil


> hello,
> the cylinder block on my 928 has cracks at the top of 2 cyliders due to
> overheating and possible hydraulic pressuring from water being in the
> cylinder.
>
> i can find a good welder who can weld repair the cracks but i can't find
> anyone to nicasil the cylinder walls after the repair is done.
>
> it sems that there are some nicasil coaters out there but they are only
able
> to handle small motorcycle cylinders and none of them that i've contacted
> can handle a V8 sized block.
>
> i've been told that Mahle who do the OEM coating for porsche are not
> interested in doing repair work and they refuse to accept repair work.
>
> i'd be grateful if anyone can tell me of a nicasil coater that they have
had
> a good job from.
>
> alternatively, if anyone has a block or an engine in good condition for a
> 1994 GTS 5.4 litre 32 valve that they could sell me i'd be interested in
> discussing that too.
>
> i've considered sleeving the bores but i prefer to try and bring it up to
> the original specs before resorting to that method.
>
> any suggestions would be gratefully received.
> regards,
> paul greenwood
>
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