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Thread: leak down results
          
   
   

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  1. #1
    bellaireroad is offline CHR Junior sMember Visit my Photo Gallery
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    leak down results

     



    these are the results of a leak down test done recently on a 1969 427/400 3963512 block

    1 3 5 7
    35% 18% 16% 23%


    2 4 6 8
    18% 43% 33% 30%

    What's it look like the problem may be? The engine was running great before the test was done. Good oil pressure, ran fairly cool, started up easily, but noticed a little smoke from the R exhaust on startup, that disappeared after 30 seconds.

  2. #2
    jerry clayton's Avatar
    jerry clayton is offline CHR Member Visit my Photo Gallery
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    Was the spark plug #4 a little oily????

    One common thing on BBC and especially older ones are that the valve seals fall apart and oil the cylinders---

    Idea of doing leakdown tests is that you can listen at intake, exhaust, valve cover breather to see where IT SOUNDS LIKE THERES A LEAK!!!!

  3. #3
    bellaireroad is offline CHR Junior sMember Visit my Photo Gallery
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    Hello Jerry,

    I didn't do the test, but was told it was probably the rings. I guess what you are saying is that you can't tell from the pattern?

  4. #4
    jerry clayton's Avatar
    jerry clayton is offline CHR Member Visit my Photo Gallery
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    No--the pattern there would be about the same as doing a compression check----a leakdown lets you listen for the air escaping which will tell if its rings, intake, exhaust valve, gasket, etc

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