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Question re: YICS tool and compression test

Discussion in 'XJ Technical Chat' started by shnuffy, Jun 23, 2010.

  1. shnuffy

    shnuffy Member

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    I've been told that you don't need to use the tool in order to do a compression test. I'm curious now...

    Is this because the compression occurs as the piston rises toward to the top of the cylinder, which is clearly above the YICS port?

    That is to say the YICS only does its thing as the piston is close to it's lowest point in the cylinder and is "irrelevant" for that cylinder after the piston rises above it?

    Weird question, I know. Just trying to visualize it all.
     
    shnuffy, Jun 23, 2010
    #1
  2. TIMEtoRIDE

    TIMEtoRIDE Active Member

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    The YICS system works with the intake system - -on the intake stroke.
    Testing compression is done with the intake valve closed, on the compression stroke.
    Throttle held wide open, plugs all 4 out, ignition disabled, and battery on a 2/10 car charger for best numbers.
     
    TIMEtoRIDE, Jun 23, 2010
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  3. c21aakevin

    c21aakevin Member

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    Yics is not connected to the jugs, it is just molded in. It connects through the head.
     

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    c21aakevin, Jun 23, 2010
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  4. MiCarl

    MiCarl Active Member

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    To clarify: The YICS ports are to the intake runners, not directly into the cylinder. Therefore they are behind the valves and do not affect compression.
     
    MiCarl, Jun 23, 2010
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  5. shnuffy

    shnuffy Member

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    Awesome, thanks guys!
     
    shnuffy, Jun 23, 2010
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