[s-cars] Engine Compression Test (Warm or Hot?)

[Trevor Frank]

A compression test is o.k. to see if the motor is still alive, but if
you want some good info on what may be wrong with the motor I would do a
leak down test.  This is especially useful if you are purchasing a used
car.  It can give a decent indication of the condition of the rings and
valves.

-----Original Message-----
From: James Murray (LMC) [mailto:James.Murray at ericsson.ca]
Sent: Monday, November 25, 2002 6:44 AM
To: 's-car-list at audifans.com'
Subject: [s-cars] Engine Compression Test (Warm or Hot?)


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Does a compression test need to be done while the engine is warm? Or can
it be done while cold?

I did one while the engine was cold and got a fairly consistant 11 or
11.5 bar on all 5 cylinders. Specifications are between 9 Bar and 13 Bar
and the wear limit is supposed to be 7 Bar, while max difference between
cylinders is 3 Bar.

Just wondering if I need to re-run the test to ensure I got valid data?

Cheers, /James
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