Compression method suggestions, test procedure step by step

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

In message <3.0.4.32.19971115124900.00692f20@mailer.cosmoslink.net> Avi writes:

> Here is what you do:
> 
> remove timing belt ...
  
> attempt to start car ...
  
> if engine spins freely and NO mechanical noises (of any kind) are heard,
> car has low compression engine

No.  If NO mechanical noises are heard, it _HAD_ a low compression engine.

If mechanical noises are heard, it _HAD_ a high compression engine but it now 
has a _LOW_ compression engine.  Perhaps _VERY_ low.

> The above method is a proven method (NOT, BTDT......), although rather
> costly at times, I know and used other  methods but the above method is
> FOOL PROOF.....

Actually, I wouldn't risk _ANY_ I5 engine as non-interference.  I know the WR 
is theoretically so, but I know of at least two people with BTDT holes in 
their wallets from WR timing belt incidents.

I think the only reliable way to determine CR is by measuring the critical 
dimensions or by checking the paperwork.  I'm slowly becoming convinced that 
simple CR measurement using devices that screw into the plug hole is a very 
inexact science indeed.

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