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Gtir Motorsport club » Tech room » Help and Advice » Compression test

Compression test

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1Compression test Empty Compression test on 28th September 2015, 8:04 pm

Rscozzy


Done a compression test all 4 reading 125psi is this good had a lot of white creamy stuff on rocker cover and forged breather system doesnt over heat but gets hot really fast fans working doesn't miss fire engine is ment to b forged

2Compression test Empty Re: Compression test on 28th September 2015, 8:33 pm

johnny gtir

johnny gtir
moderator
moderator
Forged breather system ? And has the car stood ?

3Compression test Empty Re: Compression test on 28th September 2015, 8:47 pm

Rscozzy


It was stood for 4 years in a barn been back on road 2 mth changed oil filters etc before running

4Compression test Empty Re: Compression test on 28th September 2015, 8:48 pm

Rscozzy


Forged breather system name on catch tank

5Compression test Empty Re: Compression test on 28th September 2015, 9:11 pm

Rscozzy


Forged motorsports

6Compression test Empty Re: Compression test on 28th September 2015, 9:21 pm

johnny gtir

johnny gtir
moderator
moderator
Now my forge oil separator I blocked the pipe off going back to the block as it was when left a few days getting Condensation in and oil was creamy then it was warming up when started and putting it into engine I was like this can not be good

7Compression test Empty Re: Compression test on 28th September 2015, 9:23 pm

johnny gtir

johnny gtir
moderator
moderator
Just out of interest what way did you comp test it and is it using water

8Compression test Empty Re: Compression test on 28th September 2015, 9:34 pm

Rscozzy


Removed spark plugs turned car over 125psi is loosing water I think but bleed system and seems to b ok not getting as hot just over 1/4 was 1/2 way befor bleeding

9Compression test Empty Re: Compression test on 28th September 2015, 10:45 pm

GTI-R US

GTI-R US
Management
Management
As said
You need to make sure air is out of the system as this will cause head to overheat which could cause cracking or best case scenario a blown h/g. 
As Johnny said above, this time of year especially you are likely to get some form of condensation especially if the car is only doing round town short trips and not getting up to required temp to burn off any unsavoury deposits in the oil system.

When you did comp test did you remove all plugs at once or one at a time?
Also if the engine is forged have they used arp head studs by any chance?


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10Compression test Empty Re: Compression test on 29th September 2015, 2:28 am

Rscozzy


Removed all spark plugs

11Compression test Empty Re: Compression test on 2nd October 2015, 5:47 am

Rscozzy


Head coming off got water in number 2 piston
Any advice on head removal and where to buy gaskets and hoses cheerd

12Compression test Empty Re: Compression test on 2nd October 2015, 6:17 am

johnny gtir

johnny gtir
moderator
moderator
Sorry am crap with links but hope this works


https://www.gtir-motorsport-club.com/t5630-buying-headgasket

13Compression test Empty Re: Compression test on 2nd October 2015, 6:19 am

johnny gtir

johnny gtir
moderator
moderator
And the workshop manual is on here ( the site)  more so for refitting onc the sequence torque settings etc

14Compression test Empty Re: Compression test on 2nd October 2015, 6:24 pm

Rscozzy


Ok cheers heads off but made a boo boo the two 8mm Alan bolts would indo so there a bit mashed got them out and then realised they don't hold head on Sad no I didn't read guide just dived straight so need two of them

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