URq Using bulk oil.

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

In message <880178159.1014073.0@melly.exchange.co.nz> Andrew Asher writes:

> Is it a case of forged pistons getting heated up too fast and losing
> their shape and hammering away at the bore ??  - If so with the head off
> we should be able to micrometer the bore and see if its out of round ?

Other way round.  The pistons are oval when cold, and don't become truly round 
until they're hot.  You don't really need to measure the bores - there's a fine 
hatching ground into the bores during manufacture (to retain an oil film in 
operation) and its absence on some sides but not others will give you a clue.

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