Re: FW: Head work - Porting, Polishing etc. & Bench Flow Tests,

["Sherry & Chuck Clark" <clark@rmi.net>]

MLP wrote:

In a follow up to a post on the S-Car list re 20valve heads, and in further
search of relevant information or personal experiences,  I though I would
check to see if anyone on this list has had experience with, or information
to share about the porting, polishing & tweaking of Audi cylinder heads for
better performance.  By way of background and as a preface to the queries
below,

   Michael,  
        When I had my total engine rebuild done, I decided among other
things to get the 10v head P&P'd. I already had the Dialynx e.m. with the
larger ports so the head ports were enlarged to match this. Also, the
intake manifold was match ported to the head. The critical factor here
is that you need an experienced shop/machinist to do the work as the
first head I had done, they hit a water jacket in the head. You instantly
have a 70 pound paperweight if this occurs as I sure wouldn't trust
any measures in welding to backstep this mistake. No, I don't know
stock numbers in reference to flow data nor did I ask to have them 
done on the new P&P'd head but all I can say is that by seat of the
pants feel, the new motor felt stronger. This was probably also due to
the new motor and not just the head work. Also, I did install a 268*
Piper cam. Idle did not suffer and once again, pull to redline feels much
better. 
  As you mentioned, the only way to really know if the gains are worth
the $$$, you should have an o.e.m. head and P&P'd bench flow tested
side by side. If the numbers are correct in the table you posted on an
8v VW motor, the cfm alone is a significant gain. Hope this helps,

Chad Clark '87 5k Tq-
Colorado Springs, CO