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  1. #1
    ou812's Avatar
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    06 RXP compression

    I used a new craftsman & a snap-on gauge but I only had the short reach adapter that is half the length of the spark plug threads. What is the normal psi difference from the long & short adapters? On these #'s what would my actual psi be?

    snap on psi
    1-124
    2-125
    3-122

    craftsman psi
    1-127
    2-127
    3-125

    Thanks


  2. #2
    speedskixp's Avatar
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    Quote Originally Posted by ou812 View Post
    I used a new craftsman & a snap-on gauge but I only had the short reach adapter that is half the length of the spark plug threads. What is the normal psi difference from the long & short adapters? On these #'s what would my actual psi be?

    snap on psi
    1-124
    2-125
    3-122

    craftsman psi
    1-127
    2-127
    3-125

    Thanks
    I'm not sure but I doubt it would make much more than a couple pound diff,. maybe 5lbs. This being said your #s look good and even.

  3. #3
    King_Of_Fun's Avatar
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    Was the engine warm and the TB held wide open? It makes a slight difference... Ron

  4. #4
    ou812's Avatar
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    Quote Originally Posted by King_Of_Fun View Post
    Was the engine warm and the TB held wide open? It makes a slight difference... Ron
    It was cold. TB WOT. Does the long adapter read more or less psi than the short one is my question.

  5. #5
    Water4fire's Avatar
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    Jim, you need to warm the ski up slightly, but your numbers seam perfect.
    The short adapter is not gonna make a difference at all. your numbers are on par with my 04. Just slighly lower, but when you warm the ski up they will rise just a bit.

    .

  6. #6
    speedskixp's Avatar
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    The short one will read slightly lower because it is taking up less space in the combustion chamber.

  7. #7

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    To obtain ACCURATE compression readings a internal combustion engine MUST be at designed operating temperature --not just 'warmed up."

  8. #8
    ou812's Avatar
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    Quote Originally Posted by speedskixp View Post
    The short one will read slightly lower because it is taking up less space in the conbustion chamber.
    That's what I was thinking. I guess I can check the gsx with both adapters & see what I get.

    Austin. I have the IC out & the exhaust seperated so I didn't run it. Were these #'s on par with your 04 COLD or warm?.
    Thanks!

  9. #9
    Water4fire's Avatar
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    My ski was warmed up to operating temp.

    .

  10. #10
    ou812's Avatar
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    The GSX warmed up I got:

    . snap-on Long adapter psi
    1-171
    2-179

    . snap-on short adapter psi
    1-167
    2-174

    So it's about 4-5 psi in difference that means my snap on #'s "COLD" are
    1-128
    2-129
    3-126

    For a comparison vs Snap-On:

    The crafstman long adapter psi

    1-174
    2-181

    short adapter psi
    1-170
    2-176

    So the craftsman is consitantly 2-3 psi higher than the snap-on. Interesting. Which is the real deal?

    Could this be because of the shorter hose on the craftsman?

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