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Thread: Odd leak down numbers... help?

  1. #1

    Post Odd leak down numbers... help?

    Hey guys, so I am looking at a 2.4L '72 with MFI and got these numbers back from the compression/leak down:

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    To me, these numbers look unhealthy at first glance. Only savior being the car hasn't been driven much (1,000 miles over the past decade or so) and at least they are consistent relative to each other.

    Then, I read that first paragraph... "A cylinder that is not leaking will read app 20%" Wait, what???

    Does this make sense to anyone?

  2. #2
    Something does not sound right to me either I thought 5% was great not 20%
    Clyde Boyer

    1972 2.5ST Coupe LHD Replica 5 speed.
    1972 2.4T/E Coupe LHD US 5 speed 69,000 miles from new
    1973 2.4E Coupe RHD Aussie 5 speed
    2007 C4S Coupe RHD Aussie 6 speed.

    Early S Registry Member #294
    First Aussie R Gruppe Member #366
    TYP 901 Register Inc #6

  3. #3
    Isn't it typical to do a compression test (valves adjusted, warm engine, etc. of course) FIRST? Then if warranted by compression results, do a leakdown to identify source(s) of low compression? Is it possible the reporter had some problem with the use of percentages? For example was 22% really .022? How does one have leakdown of 22% in a cylinder with 160 psi compression?

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