[V8] Compression test numbers

7013885254 chance9121 at gmail.com
Mon Sep 21 08:17:05 PDT 2009

My guess would be piston rings or valve guides/seals with emphasis on 
valve guides.  They can get enough play in them to have the valve 'wobble' vack and forth.  Unfortunately the only way to test them  is to remove the heads and check the play with a few simple tools.

Happened in my VW 16V 2.0 as well.  Gets worse over time. 

numbers within spec, yes.  but probably a bit lower than desired.  Mine pegs 148 or better on all 8 
---- Original Message ----
From: "ville.hiivola at suomi24.fi" <ville.hiivola at suomi24.fi>
Date: 9/21/09 3:25 am
To: "V8 at audifans.com" <V8 at audifans.com>
Subj: [V8]  Compression test numbers
The numbers for 4.2 are 131-203. Wear limit the same 109. Your 
compressions have so little difference, that they seem good to me. The 
manual states that oil consumption on these engines is normal up to 

>----Alkuperäinen viesti----
>Lähettäjä: toml99 at todomundo.com
>Päivämäärä: 21.09.2009 7:31
>Vastaanottaja: "v8audi"<v8 at audifans.com>
>Aihe: [V8] Compression test numbers
>Hey, well I finally got around to doing the compression test on the  
>93 Pearl as I'm thinking of selling it.  It consumes a bit of oil,  
>and when you jump on it, can smoke quite a bit....then other times 
>seems fine.  All 8 plugs look healthy.  The numbers are  
>125/130/125/130/125/125/130/125 with no change when I put some oil 
>the cylinder.  My book for the 3.6 shows 145-189 new, wear limit  
>109.  Just wondering if the 4.2 is the same?.  There's a small weep  
>of oil underneath, but nothing that actually hits the ground.   
>Wondering if anyone can concieve of anywhere the oil could get 
>into the exhaust manifold, as the plugs look way too nice to be  
>burning the amount of oil it's burned on a few occasions.  Could it  
>be sucking it right out of the exhaust guides at full throttle into  
>the manifold?  Didn't go thru as much oil when the girlfriend was  
>driving it.  Idles perfect and quieter than the other 2 cars, and  
>get's up and goes on the highway(except the motorcycle behind me 
>a motion like he was holding his nose).....Hope all's well...Tom
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