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Gtir Motorsport club » Tech room » Help and Advice » Head gasket

Head gasket

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1 Head gasket on 9th October 2015, 5:30 pm

Rscozzy


Just got head back from skimming they removed 4 thousand from surface
Need advise on what size head gasket to get and how to measure cheers or do I just get same cheers

2 Re: Head gasket on 9th October 2015, 6:20 pm

Mr B

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gtir technician
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What you have in it before !
Some things you will need review for HG thickness are what block & head skimming been done in total if this not the first skim.
what compression ratio you plan for your build
what pistons & cams you got ( have you got appropriate clearance)
what gasket manufacturer you buying from as they differ in available size range

if previous gasket was well chosen then a skim of 4tho which like 10th of a mill is no major change.
If unsure of what work been done before then it wise measuring block & head to see what been taken off it (workshop manual has data on this)

3 Re: Head gasket on 9th October 2015, 6:27 pm

Rscozzy


Got forged Pistons in not sure of make old head gasket is
88m bore and 1.7mm thick not sure on compression just want something reliable old gasket as number 2 above each piston

4 Re: Head gasket on 9th October 2015, 7:37 pm

Mr B

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what your piston/bore size ?
cosworth do 87mm bore & 1.8 which likely what you had, 1.8 is bit thick though unless had lots of machining done or require the low comp ratio for your build agenda.
ideally you want measure block & head depths so you know what been taken off before as it possible a 1.5 gasket could be best choice.
also match head gasket to block bore, is tricky with cosworth as they only do 87 & 90 bores, I tend use apexi gaskets fair bit as their 1.5 87bore & 88bore tends lend itself well to many rebuilds



Last edited by Mr B on 9th October 2015, 8:03 pm; edited 1 time in total

5 Re: Head gasket on 9th October 2015, 7:39 pm

Rscozzy


How do I measure block and head carnt find it on here

6 Re: Head gasket on 9th October 2015, 7:55 pm

Mr B

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PDF file is in useful links section

direct link below for relevant PDF
https://drive.google.com/file/d/0B7Ub2apq5-pfQXVvdXNRb3ZRanM/view?usp=sharing

7 Re: Head gasket on 9th October 2015, 8:03 pm

Rscozzy


Cheers

8 Re: Head gasket on 12th October 2015, 8:02 pm

Rscozzy


Still confused with which head gasket to get old head gasket bore is 88mm but engine bore is 86.5mm do I get 88mm bore or 86.5mm bore sorry for all the post

9 Re: Head gasket on 12th October 2015, 8:22 pm

Gostek

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I'd say if you're going for mild boost upgrade get 87mm bore 1.5mm thick cosworth gasket but everything depends on what you're planning to do with car... I don't know if you can actually get 86.5mm bore head gasket


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10 Re: Head gasket on 12th October 2015, 8:33 pm

Rscozzy


What's confusing me is the old head gasket 88mm bore and 1.7mm thickness but engine piston bore is 86.5mm had head skimmed they took 4 thou off would 87mm fit
The car has forged Pistons front mount intercooler standard turbo avcr boost controller was running 1psi boots before head gasket went

11 Re: Head gasket on 12th October 2015, 8:42 pm

Gostek

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Skimming does not change bore size and 4 th to be honest is not much and if you'll search threads here I believe Bob was explaining something about bore. Point is get smallest bore you can fit (in your case it'd be 87mm) so the gap left between cylinder and gasket is as small as possible


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12 Re: Head gasket on 12th October 2015, 8:43 pm

Gostek

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13 Re: Head gasket on 12th October 2015, 8:59 pm

Rscozzy


Ok cheers guys 1 more thing old gasket was 1.7mm thick
Could I get a lower thickness like 1mm even though I had 4thou taken of head

14 Re: Head gasket on 12th October 2015, 9:08 pm

Gostek

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Well here comes stuff Mr B was writing about measuring head and block to find out what machining was done to it etc, and what are you going to use it for what boost pressure etc... I'd say that 1.5mm would be safe thickness but don't quote me on that....


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15 Re: Head gasket on 12th October 2015, 9:09 pm

Rscozzy


Ok cheers for all the help thanks hopefully last post on this subject Smile

16 Re: Head gasket on 12th October 2015, 9:12 pm

Gostek

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We're here to help Smile or confuse even more lol!

17 Re: Head gasket on 12th October 2015, 9:45 pm

Rscozzy


Sorry 1 more thing any uk suppliers who I can get head gasket from thanks

18 Re: Head gasket on 12th October 2015, 9:50 pm

Gostek

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http://www.japspeed.co.uk/cosworth-nissan-sr20det-multi-layer-head-gasket.html

But this is not pulsar specific you'll have to enlarge two holes for locating dowels


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19 Re: Head gasket on 12th October 2015, 9:55 pm

Gostek

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20 Re: Head gasket on 12th October 2015, 9:56 pm

Mr B

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One thing you can be sure of the guy who installed the 88mm bore gasket was not well clued up so don't copy him without bit of checking first ...
Like gostek says, 86.5 bore wants 87mm bore gasket at most.
I would guess 1.5mm would be about right thickness but that guessing and to do it right it needs measuring along with knowing planned power/boost etc .

21 Re: Head gasket on 19th October 2015, 9:07 pm

Rscozzy


Any 1 fitted a Sirius head gasket do u need to modifi them

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