Re: Compression method suggestions, test procedure step by step

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

In message <34713C41.E946B4F8@poboxes.com> Gerard writes:

> They do, as far as I know, on the normally aspirated models. On the
> turbo models it is a different story. I think keeping the stock head
> and compression of the normally aspirated models and slapping a turbo
> unit on is asking for trouble, all that pressure could increase the
> height of the hood cover! :) I looked at those thick manuals that
> most of the mechanics have. They list all the cars up to a certain
> year, each one has timing listins, history, number sold, type of
> engine, compression ratios, etc, etc. I looked at the S4, it is
> running 9.2:1 while the 500 Turbo (200T in the States) is a mere
> 7.2:1.

I have it as 7.8:1, changing to 8.4:1 with the 1989 model change after VIN 
KN038268.  In the UK ur-quattro, essentially the same engine achieves 8.6:1 - 
my own engine measures at 10.6:1 or just above in all cylinders.

(After 149500 miles!)

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