90cq to 20v turbo???

[Matt Beaubien]

Peter,

Sodium valves are more of a long-term durability item--something that won't
turn up for 100k+ miles.  Also, the exhaust temps are not necessarily higher
on a turbo engine that a NA one (if tuned properly).  Modern engines limit
their EGT (regardless of induction) to ~1600'F to protect the catalytic
converters.

Matt Beaubien
'86 5kt
'73 911E

----- Original Message -----
From: "Peter Berrevoets" <pjberr at home.com>
To: "1 Quattro List (E-mail)" <quattro at audifans.com>
Sent: Sunday, March 04, 2001 8:24 PM
Subject: RE: 90cq to 20v turbo???


> Biggest problem - valves
>
> The 20 valve NA has regular valves while the 20V (and 10V) have sodium
> filled valves to withstand the turbo temps. Reliability and maximum boost
> will be decreased.
>
> Sorry,
>
> Peter Berrevoets
> 1990 200TQ
> Toronto, Canada
> http://frontpage.home.net/pjberr/



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