corsasport.co.uk
 

Corsa Sport » Message Board » Help Zone, Modification and ICE Advice » Compression test results = confused? » Post Reply

Post Reply
Who Can Post? All users can post new topics and all users can reply.
Icon:
Formatting Mode:
Normal
Advanced
Help

Insert Bold text Insert Italicized text Insert Underlined text Insert Centered text Insert a Hyperlink Insert Email Hyperlink Insert an Image Insert Code Formatted text Insert Quoted text
Message:
HTML is Off
Smilies are On
BB Code is On
[img] Code is On
Post Options: Disable smileys?
Turn BBCode off?
Receive email notification of new replies?

Corsa_Sport21

posted on 13th Jun 12 at 20:39

Cracked head??

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


williamsvts

posted on 13th Jun 12 at 20:35

they are prone for leaking behind the timing cover gasket and they leak coolant into the sump check the oil for and mayonaise sumstance


andy_mk3

posted on 13th Jun 12 at 01:24

They do seem rather high yes! Time for some maths :D

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.


Danz_Corsa

Icon depicting mood of post posted on 12th Jun 12 at 20:14

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]