[s-cars] Are all Audi AAN heads cracked?

[brian hoeft]

in my experience the problem is more pronouonced in 10v motors and its not a
big deal so long gas the cracks are only slight and between the valve seats
& not leaking.. heard of shops welding the cracks and heard of folks
not fixing cracks, then boosting the same w/o harm.. myself being one, with
a stage 3 audi 5k, sold running strong with ?380k miles... till a tree fell
on it..



PS your friend probably isnt searching hard enough.. my email sent to an
audifans post of a good AAN head wasnt returned.

no empathy for slackers, -brian




On Thu, Oct 1, 2009 at 5:52 PM, chris chambers
<fastscirocco_2000 at yahoo.com>wrote:

> Gentz,
>
> back onto the cracked head topic....
>
> Is it ever acceptable to have cracks in an AAN head when using the head for
> higher than stock horsepower? Is there a guide on acceptable cracks?
>
> Joel has been hunting for a replacement head for his S6 and heads that were
> described to be guaranteed crack-free have multiple cracks.
>
> I and Joel would welcome your informed input!
>
> Thanks
> Chris
>
>
>
> ----- Original Message ----
> > From: Cody Forbes <cody at 5000tq.com>
> > To: "Bares, Vittorio" <Vittorio.Bares at nuance.com>; chris chambers <
> fastscirocco_2000 at yahoo.com>; Scar <s-car-list at audifans.com>
> > Sent: Wed, September 23, 2009 12:25:28 PM
> > Subject: Re: [s-cars] Are all Audi AAN heads cracked?
> >
> > My experiance on the matter is with 10v heads. I'd bet it's a simmilar
> > situation. For the 10v heads Audi supplies a spec for cracks.
> >
> > From the 5000tq Bentley "Cylinder heads with cracks between the valve
> seats or
> > between the valve seat and the threads of the spark plug holes can be
> reused and
> > resurfaced without reducing the service life if the crack(s) do not
> exceed a
> > width of 0.5mm (.020in)."
> >
> > -Cody Forbes
> >
> > ----- Original Message ----- From: "Bares, Vittorio"
> > To: "chris chambers" ; "Scar"
>  >
> > Sent: Wednesday, September 23, 2009 8:08 AM
> > Subject: Re: [s-cars] Are all Audi AAN heads cracked?
> >
> >
> > I just changed the HG on my AAN head. My head has cracks - and I've been
> told by
> > this list as well as on Motorgeek that this is just the way it is. We
> live with
> > it - apparently without adverse effects. I replaced my head with one that
> had no
> > cracks - I just happened to come into one through a series of events.
> >
> > I will say that the machine shop was not comfortable with the cracks.
> >
> > Vittorio -
> > -----Original Message-----
> > From: s-car-list-bounces at audifans.com [mailto:
> s-car-list-bounces at audifans.com]
> > On Behalf Of chris chambers
> > Sent: Wednesday, September 23, 2009 8:02 AM
> > To: Scar
> > Subject: [s-cars] Are all Audi AAN heads cracked?
> >
> > Gentz,
> >
> > I have a friend searching for a good uncracked AAN head.
> > He just found out that the head he had purchased that was described as
> havin
> > been
> > rebuilt ~10,000 miles; has cracks in all 5 cylinders, with multiple
> cracks in
> > 2,3 & 5.
> >
> > So my questions are:
> >
> > 1. Do all of these AAN heads have cracks and we simply live with them or
> is he
> > just having a hard time?
> >
> > 2.I have an unmolested stock engine (car wasn't chipped) that runs well,
> if I
> > pull the head off that for him
> > is it likely that I will discover it has cracks in it's head.
> >
> > 3. What is the best way to check a running engine for cracks in the head?
> >
> >
> > Regards
> > Chris
> >
> >
> >
> >
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>
>
>
>
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