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  1. #1
    BallaRXP's Avatar
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    Compression Test

    What size adapter will I need?

    What PSI is Normal/Average?


  2. #2
    wotxxxsd's Avatar
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    With your compression tester you should have 3 possible fits just match up your spark plug to the size.
    145-150 is great compression on a supercharged doo.
    But my tester reads 130-135 per cylinder and my mechanics tester reads 145 per cylinder.
    Every different tester will give different results.
    As long as all the cylinders are about even psi your good to go.

  3. #3
    boost junkie skidoochris's Avatar
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    you also should do a leak down test

  4. #4
    skigolfnut's Avatar
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    explain how you have done your leak down test skidoochris?
    standing by,

  5. #5
    Vman's Avatar
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    http://www.mobiloil.com/USA-English/...down_Test.aspx

    Leakdown can be key. I had 140-140-140-150 psi warm compression on my 300 and still had 40-50% leak in every cylinder.

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