Compression test reading question

Discussion in 'Street/strip 400/430/455' started by staged67gspwr, Oct 12, 2003.

  1. staged67gspwr

    staged67gspwr "The Black Widow"

    I did a compression test on the `65 GS which is 100% stock and all cylinders read about 150-160 and then out of curiosity i did one on my `67 GS which is worked and that read about 190-200,my question is can that verify about how much compression i have on the `67?does anyone have an idea with that reading about how much compression i have?

    Thanks
     
    staged67gspwr, Oct 12, 2003
    #1
  2. Floydsbuick

    Floydsbuick Well-Known Member

    I can't verify, but both sets of numbers are very good! 200psi! Sheesh.....you got 11 to 1s in there?
     
    Floydsbuick, Oct 12, 2003
    #2
  3. Madcat455

    Madcat455 Need..more... AMMO!!!

    There is a web site : http://www.smokemup.com That has all sorts of calculators for that sort of stuff. Although, I think compression has a little more to it than just your cylinder pressure:Do No: :Do No:

    BTW... I have 12:1 pistons (supposedly OEM Stg. 2's), and pull 185-190psi too, yet have no problems running any grade gas. some say you can't run over 11:1 on pump gas. So its anybodys guess.

    HTH... I'll be watching too.
     
    Madcat455, Oct 12, 2003
    #3
  4. grant455gs

    grant455gs Well-Known Member

    Sorry George, its hopeless to guess. Cam timing GREATLY affects the test. But those are VERY GOOD #'s, and you can rest assured that its "fairly high".:Brow:

    Did you ever put the SP-1 on?
     
    grant455gs, Oct 12, 2003
    #4
  5. staged67gspwr

    staged67gspwr "The Black Widow"

    Yea i kinda figured it would be high but i understand that you cannot really figure out about how much compression i was just trying to figure around what i might have,thanks for all your replies guys,and i havent put the SP-1 in yet should be soon though.


    Thanks
     
    staged67gspwr, Oct 12, 2003
    #5

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