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    Compression test

    Ok so my b25 was leaking oil from the front oil return port, so i replaced the headgasket about a month ago. After the change it was still leaking until about a week and half ago, but now is not leaking. I thought the head was warped, but now i'm not sure since it quit.

    I decided to persue the state of the head with a compression test and here is what i came up with...all plugs out, fuel relay pulled, WOT.
    #1 - 155
    #2 - 160
    #3 - 152
    #4 - 145
    #5 - 120
    #6 - 170

    Now i'm not really sure what this is telling me. I haven't noticed any problems driving the car, but am concerned that they are all over the place. Should I try some seafoam in the crankcase? Any suggestions are appreciated.

    #2
    You need to do both a dry and wet compression test as well as a leak down test to figure out what's going on. Those numbers could mean anything (bad gasket, worn rings, or worn valves)
    The car makes it possible, but the driver makes it happen.
    Jim Levie, Huntsville, AL

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      #3
      Originally posted by jlevie View Post
      You need to do both a dry and wet compression test as well as a leak down test to figure out what's going on. Those numbers could mean anything (bad gasket, worn rings, or worn valves)
      +1 or a lot of other things, like an impropery seated HG or a little scratch on a cylinder wall
      1989 cirrisblau-metallic 325i

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