Re: Carbon and compression tests

["Romeo Shayne Pavlic'" <bcpi@arias.net>]

I also know that if you don't crank on each cylinder for about 8 or so
seconds, you will not get an accurate reading.  Check to see that the
compression meter was screwed into the plug holes all the way.


Shayne
----------
>From: "Bernard Littau" <bernardl@acumenassociates.com>
>To: "quattro group" <quattro@coimbra.ans.net>
>Subject: Carbon and compression tests
>Date: Thu, Mar 04, 1999, 14:23
>

>Hi all,
>
>I did a pre-purchase compression test on a 5k turbo motor in an '86 Audi I
>am considering purchasing.  The car was luke warm, and we got 130 128 120 60
>80 on a dry test.  This was deemed not good.  A wet test brought number 5 up
>15 to 95.
>
>Owner took same 5k to his mechanic, and they did a warm compression test
>getting 155, 150, 150, 145, 150.  Cold was in the 110-125 range (I didn't
>get the actual numbers).
>
>Owners mechanic commented the only logical explanation is that when my
>mechanic
>did the test, carbon flakes probably got into the space between the valves
>and the valve seats.  When ever you take the plugs out it is likely that
>some of the carbon buildup flakes off into the cylinder.
>
>Has anyone run into this sort of thing?  Plugs did not look carbonized.
>They even looked a bit on the lean side.
>
>Comments in general on compression tests on the I5?
>
>Best,
>
>Bernard Littau
>Woodinville, WA
>Audi-less
>
>
>