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Thread: M52 before turbo - compression test

  1. #1
    Join Date
    Jul 2019
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    Czech Rep
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    51
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    E36 328i

    M52 before turbo - compression test

    Hello, here are my compression test results. I wanted to make sure that engine is OK before going turbo. It was running nicely before, no oil burning etc.
    M52B28, stock, unopened, COLD engine, fuel disabled, thorttle wide open, all spark plugs out.

    Now I am a little bit concerned with cyl. 4. What do you think ?

    RESULTS:











  2. #2
    Join Date
    Oct 2006
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    Toronto, Canada
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    E36 Turbo
    Looks ok to me - however a hot compression test is what you'd want to do

  3. #3
    Join Date
    Apr 2014
    Location
    Cardiff, UK
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    E39 528i, E46 325ti
    Shouldn't it be more around 200psi on a cold unopened engine with stock compression? Maybe my compression tester is way off, but a cold test on my Euro stock compression M52B28 is normally about 200psi. Before boosting mine I think it was almost 220psi, since boosting I think it ranges from like 196 - 212psi.

  4. #4
    Join Date
    Oct 2006
    Location
    Toronto, Canada
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    E36 Turbo
    Quote Originally Posted by MrMuddle View Post
    Shouldn't it be more around 200psi on a cold unopened engine with stock compression? Maybe my compression tester is way off, but a cold test on my Euro stock compression M52B28 is normally about 200psi. Before boosting mine I think it was almost 220psi, since boosting I think it ranges from like 196 - 212psi.
    Doubt you would see that kind of numbers on a cold engine - warm engine sure.

    There is no point to do a compression test cold

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