Compression tests at cylinders....

[Jimmy-Boy]

Hi just had my head rebuilt and skimmed (car running ph3s, jenvys and omex 600 ecu)

my readings were 8bar 8bar 8bar and 14bar is this normal ? :/

the car runs sweet however.

:geek:

[Gabbastard]

No,all cylinders should be within 1bar of each other.

How was the test for repeatability?

[jones91]

As above, all cylinders should be roughly the same reading, by the looks of it, you either have knackered valves, worn piston rings or your compression test reader is faulty

[yr51ocw]

out of that, only cylinder 14 looks healthy. Have you have a leakage check done?

[Alfie09]

out of that, only cylinder 14 looks healthy. Have you have a leakage check done?

Not really

They say the levels being even is what you want

[blackie_2k5]

Yes but anything under 10 bar is low compression, really low

[sexy_gt]

For reference iirc my old engine with 708cams was 15bar, lowest was 14,8 or something.

[yr51ocw]

Not really

They say the levels being even is what you want

Agreed, if it were a low static compression with lots of overlap, but this isnt. Hence there is something wrong with cylinders 1,2 & 3 which requires some more attention.

Please dont offer advice if what you are offering is poor advice.

[blackie_2k5]

Who did the work mate?

And did you test all cylinders the same? Eg all throttle open, or all throttle closed? Not mixed?

[Jimmy-Boy]

i thought readings are bad, it's one of my mates that has been working on cars for about 10years and definatly one of the best in my area so i know thats not the problem. ATspeed did the work before hand taking head off etc but never did headskim and gasket and it had a bad seal, so when oil got hot on track it seaped out the head. Hense changing it, i can't say i would reccomend ATspeed though after seeing the lack of attention to detail when shelling big £££

Will find out above info and message back.