Oil overpressure

[quk@isham-research.demon.co.uk (Phil Payne)]

In message <3e0ff533.34cab9ed@aol.com> MHLIGGINS writes:

>      I intend to have the head reworked.  Been checking with Bob at Shine
> Racing Service.  At the moment I am not planning to have the head ported, just
> gasket matched - unless it is the concensus of several Q-listers that porting
> is necessary.  My thought is that the porting would probably move the power UP
> the rpm band, and there is not enough low end now.  Comments welcome (or if
> you remember where you made the comments before send me a date and I'll check
> the archives).

Don't.  If you port the head, you have to tell the ECU to shove more fuel in 
for a given boost.  I suspect reprogramming ECUs to do this (as distinct from 
simply ZAPping tables to allow more boost) is an esoteric skill.  I don't think 
you can buy it.

>      Since the wear is so small I am thinking about simply re-honing the
> cylinders and using news rings.  Will that work?

Why re-hone?  Audi's cross-hatching is an oil retention mechanism - can you 
reproduce it?

-- 
 Phil Payne
 Committee Member, UK Audi [ur-]quattro Owners Club