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Author Compression test results = confused?
Danz_Corsa
Member

Registered: 24th Aug 03
Location: Uni in Manc / Home in MK
User status: Offline
   12th Jun 12 at 20:14   View User's Profile U2U Member Reply With Quote

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]
andy_mk3
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Registered: 18th Dec 11
Location: Peterborough
User status: Offline
13th Jun 12 at 01:24   View User's Profile U2U Member Reply With Quote

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.
williamsvts
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Registered: 11th Apr 06
Location: north east
User status: Offline
13th Jun 12 at 20:35   View User's Profile U2U Member Reply With Quote

they are prone for leaking behind the timing cover gasket and they leak coolant into the sump check the oil for and mayonaise sumstance
Corsa_Sport21
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Registered: 13th Apr 08
Location: Leven, Fife. Drives : 205 GTi
User status: Offline
13th Jun 12 at 20:39   View User's Profile U2U Member Reply With Quote

Cracked head??

Faulty cylinder head gasket is normally low compression across 2 cylinders.

 
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