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Xj550 compression test

Discussion in 'XJ Technical Chat' started by Noahsxj, Aug 11, 2021.

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  1. Noahsxj

    Noahsxj Active Member

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    Finally took a compression test after roughly 5 months of building…

    don’t ask why I didn’t lol

    here’s the results in numerical order.

    I’m really really happy with this! Unless I shouldn’t be?

    also all my plugs looked identical and had just a small amount of white fuzz but mostly black.

    Which I’m also really happy(?) with!
     

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    Noahsxj, Aug 11, 2021
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  2. Noahsxj

    Noahsxj Active Member

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    #1 - 119lbs
    #2 - 125lbs
    #3 - 120lbs
    #4 - 135lbs

    #4 is a bit high, what could be causing this?
     
    Noahsxj, Aug 11, 2021
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  3. Blackbird

    Blackbird Member

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    Carbon build up in #4?
    Maybe exhaust valve not opening properly. When is last time valves were adjusted?
     
    Blackbird, Aug 11, 2021
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  4. Blackbird

    Blackbird Member

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    I would also highly recommend you do a leak down test. This may be more important if you had low compression but I have found it to be a great indicator of the health of your motor.
     
    Blackbird, Aug 12, 2021
    #4
  5. Noahsxj

    Noahsxj Active Member

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    Turned out my valve clearance on all exhaust was tight, but especially #4, I’ll be swapping them today!
     
    Noahsxj, Sep 11, 2021
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