Leak Down test and oil use...again

Derek Pulvino dbpulvino at hotmail.com
Fri May 21 16:10:35 EDT 2004

So I guess all you've got to do is say the same thing twice and it makes 
sense?  I had a feeling I knew what you were looking for, but I didn't have 
the specific piece of information...ie what is the restriction between the 
two gauges.

Anyhow, thinking about things, if as inidcated rings are bad, leading to 
increased consumption, I've got to wonder why I don't see oil burning?  
Isn't that a common situation with a bad ring(s)?  Like I've said before, I 
don't see oil coming out the tail pipe and there is no residue on the rear 

Derek P

Message: 5
Date: Tue, 18 May 2004 22:24:04 -0700
From: "John Gourley" <azaudi at msn.com>
Subject: Re: Leak Down test and oil use...again
To: "Audi 200Q 20V" <200q20v at audifans.com>
Message-ID: <BAY5-DAV80nla0Q4HI00000ab45 at hotmail.com>
Content-Type: text/plain;	charset="iso-8859-1"


>I still don't understand your explanation of the percentage figures for 
>leak down test because I don't understand what test flow restriction is in
>between the measured input and output pressures,


If i may step in this discussion........with the leakdown tester you connect
the air hose from the compressor to the tester....adjust the gauge on the
tester to 100 psi of air...make the connection to the cylinder you are
testing....whatever the number Derek mentioned, let's say 20%.
All it is, that cylinder is leaking 20% of the air pressure going into that
cylinder, therefore 20% leakdown on the cylinder.  So it really isn't a
complicated tester, simply measuring what percent of the air pressure going
into the cylinder leaks out.
Using a leakdown of course take more time than a compression test but as
Derek pointed out, the nice thing about a leakdown it helps point you closer
to the problem area...listening for where the air pressure is
leaking.........air pressure from the tailpipe, exhaust valve........air at
the intake, intake valve.......bubbles in the engine coolant, head

John Gourley

Learn to simplify your finances and your life in Streamline Your Life from 
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