HELP! 10V Turbo I-5 piston sources needed!!!

[ed armstrong]

Ameer,

As others have posted, 8.5:1 compression for a modern
turbo motor is not a bad or dangerous thing relatively
speaking. It will certainly help with off boost
driving. From what I understand the MC-1 with 7.8:1
compression is a bit of a low-end dog. Most modern
turbos are relatively high compression, at least above
8.0:1, some with 9.0:1

Turbos have come a long way in 25 years. Anyone
remember the original Porsche 911 turbos with 6.5:1
compression ? Talk about boost lag! But at the time
they were state of the art: putting out ~250 HP when
the best American factory V-8s were barely over the
200 HP level due to smog equipement etc (We're talking
the late 1970s here !)


--- Ameer Antar <antar at attbi.com> wrote:
> I'm curious about your piston group purchase.. They
> were 8.5:1?? What's the
> reasoning for the jump from stock MC 7.8 to 8.5? I
> thought that higher
> compression motors were'nt good for a high perf.
> turbo motor? Funny, I
> remember a couple yrs ago, people telling me my KH
> motor (8.3:1) would blow up
> if I tried to turn up the boost..TIA.
>
> -ameer
>
> ---Original Message---
> >
> >To: Ameer Antar <antar at attbi.com>,
> quattro at audifans.com
> >From: ed armstrong <edshred2000 at yahoo.com>
> >Date: 8/20/2002 12:51:33 PM
> >Subject: Re: HELP! 10V Turbo I-5 piston sources
> needed!!!
> >
> >Ameer
> >
> >The Audi factory options in this country are very
> >limited indeed ! I could not find oversize
> replacement
> >pistons for my MC-1 at a price I could afford when
> I
> >was in the rebuilding stage.
> >
> >Instead I participated in a group buy organized by
> >Javad Shadzi for a set of Wiesco pistons. These
> were
> >82 mm I believe (required boring of block) with a
> >8.5:1 compression. The machinist would did the work
> >commented they were very nice.
> >
> >If you are interested I still have the spec sheet
> from
> >Wiesco. I'm  sure they have the "design" in their
> >database and could make you a set very easily. But
> >expect to pay substantially more than the ~$550
> price
> >we paid.
> >
> >-ed
> >
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=====
-ed

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