Danz_Corsa
Member
Registered: 24th Aug 03
Location: Uni in Manc / Home in MK
User status: Offline
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Evening all,
Just done a compession test on my 2006 1.2 Corsa C SXi (Z12XEP) as she is losing coolant without a visable leak.
The results were (in bar and the scale stopped at 21!):
Dry 1 | Dry 2 | Wet 1 | Wet 2
Cylinder 1 15 15 21+ 21+
Cylinder 2 14 15 19 21+
Cylinder 3 15 14 18 21+
Cylinder 4 11 12 18 20
Can anyone advise on what the above might suggest is wrong?
Thanks in advance
[Edited on 12-06-2012 by Danz_Corsa]
[Edited on 12-06-2012 by Danz_Corsa]
[Edited on 12-06-2012 by Danz_Corsa]
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andy_mk3
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Registered: 18th Dec 11
Location: Peterborough
User status: Offline
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They do seem rather high yes! Time for some maths 
Compression ratio for this engine is 10.5:1
So times that by 1.38 to give a reading in bar, which is: 14.49 bar.
So your dry readings are looking ok. How much oil did you put down the bores for a wet test? You only need a very small amount (5-10ml's). Any more and the oil becomes a complete seal giving very high compression.
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williamsvts
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Registered: 11th Apr 06
Location: north east
User status: Offline
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they are prone for leaking behind the timing cover gasket and they leak coolant into the sump check the oil for and mayonaise sumstance
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Corsa_Sport21
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Registered: 13th Apr 08
Location: Leven, Fife. Drives : 205 GTi
User status: Offline
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Cracked head??
Faulty cylinder head gasket is normally low compression across 2 cylinders.
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