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Thread: compression issue

  1. 06-16-2011, 01:15 PM #1
    nelson9995
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    Default compression issue

    okay guys.

    im building an allmotor 82mm gsr...
    I did a 1 layer (middle) HG with copper spray yesterday
    Today, I find out the head was resurfaced 7 thousandths... the block was also resurfaced IDK how much.
    I'm using pr3 pistons with flat valves...
    I wanted around 12:4 comp. Now I think I'm at 12:8.
    What do you guys think? I want it to make as much power as possible but I want it to be reliable at 93 octane since it's my DD.

    With a 3 layer HG and regular valves comp should be at 11:5.

    I'm scared is above and now I have to change the HG. I can always add the other layer but since I copper sprayed it I think I may have to buy a new one.
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  2. 06-16-2011, 01:42 PM #2
    Vteckidd
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    Default

    youre right.

    buy a new headgasket, its $50 to know its right. Run the 3 layer and be in the mid to upper 11s and youll be much better off than mid to upper 12s on 93 octane
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  3. 06-16-2011, 02:03 PM #3
    nelson9995
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    Quote Originally Posted by Vteckidd View Post
    youre right.

    buy a new headgasket, its $50 to know its right. Run the 3 layer and be in the mid to upper 11s and youll be much better off than mid to upper 12s on 93 octane
    when can I find an oem headgasket thats 82mm for a gsr? or what if I run the top and bottom layers making it a 2 that I did not use. I should be in the lower 12s correct?
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  4. 06-16-2011, 04:09 PM #4
    Vteckidd
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    Default

    You can order one from golden eagle

    I wouldnt piece one together personally
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  5. 06-16-2011, 06:05 PM #5
    DarKStaR
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    Default

    The OEM HG is 82mm just so you know.....
    11.7@116- All motor H2B Integra
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  6. 06-16-2011, 06:24 PM #6
    Vteckidd
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    Default

    Quote Originally Posted by DarKStaR View Post
    The OEM HG is 82mm just so you know.....
    81mm

    it might open up enough to 82mm, but i know that golden eagle has an 82mm
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  7. 06-16-2011, 07:49 PM #7
    DarKStaR
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    I used factory one on my 82mm and had no issues, also on my 81.5mm.
    11.7@116- All motor H2B Integra
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  8. 06-16-2011, 08:58 PM #8
    Vteckidd
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    Weird .

    Wonder why they sell a different one
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  9. 06-16-2011, 09:19 PM #9
    nelson9995
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    Default

    i just did the 2 layer top and bottom with copper spray. if it blows once the car is running then ill replace it with an oem. i don't have the funds right now. but I do have a JDM h22a complete swap for sale lol

    btw im like at 12:5 which tuner said is perfect
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  10. 06-16-2011, 09:45 PM #10
    EmminoDaGreat
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    You can use factory up to 82, just make sure the hg does not hang over the bore. I have used stockers on 81.5 but I think max is 82.

    The EMPIRE
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  11. 06-16-2011, 10:19 PM #11
    h22 jones
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    its not that hard to put the head gasket on and see if it will work . Good luck man.

    252plus hp and 34.5 miles to the gallon all motor. 12.2 at 111
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  12. 06-16-2011, 10:26 PM #12
    nelson9995
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    Default

    dang guys... i just redid this lol.well i have a brand new 81mm head gasket. but I'm not about to take it apart. for the third time lol.

    according to the compression calculator I should be at 11:9 with the 2 layer (top and bottom)

    add .3 for the flat valves... and .2 - .3 for the 7 thousandths off the head resurface... should put me anywhere between 12:4 to 12:6 which Morris who will be my tuner said is perfect.
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