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Compression Test

Discussion in 'General Tech and Maintenance' started by skillz2k5, Jun 19, 2006.

  1. skillz2k5

    skillz2k5 Senior Member

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    So I went and got the gauge set from orielly's today and checked my compression. I did it three ways because I was getting funky readings the first two times.

    The first time I checked it was with all the plugs in except the cylinder I was checking compression on (obviously) and with the fi/em fuse still in. The results were::

    D
    120
    120
    130
    120
    T

    The second time I checked all the plugs were in but with the fi/em fuse pulled. The results were:

    D
    170
    170
    180
    170
    T

    The third time was with plugs out and fuse out. Also I cranked the car untill the needle on the gauge stopped building (I was figuring this was the correct way to go about it). The results were:

    D
    215
    215
    220
    215
    T

    Does the third method/numbers seem correct for a b series vtec motor?? Jdm B16 to be exact. Also I have heard that differences in the numbers isn't a good sign. What would cause a slight change from cylinder to cylinder. Also the D signafies dizzy side and T signafies timing belt side... for those that have no common sense :D
     
  2. MXDesa

    MXDesa Senior Member

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    It is very rare to get the same number all across the board. Your numbers are beautiful. Nice and healthy.
     
  3. cashen

    cashen Junior Member

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    Last edited: Jun 19, 2006
  4. GSRCIVICTN

    GSRCIVICTN Lost in a sea of rednecks

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    I know you don't have a problem with those numbers.
    ---CLEAN BILL OF HEALTH---
     
  5. MXDesa

    MXDesa Senior Member

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    Difference in compression doesn't mean any of those are bad. you can have up to a 15%-20% diflection in compression and the engine will be running perfectly fine.
     
  6. reckedracing

    reckedracing TTIWWOP VIP

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    did you have the throttle open when you ran these tests?

    numbers look excellent to me
     
  7. skillz2k5

    skillz2k5 Senior Member

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    The throttle open?? I never thought of that... would this make any difference?
    Thanks for all the replys to this but I'm not really looking for advise in the numbers
    more or less just the method in which it was done with the corresponding numbers.
     
  8. reckedracing

    reckedracing TTIWWOP VIP

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    of course it would, lol
    the throttle body being open = no air restriction
    you would get your peak reading faster, but since you let it spin until it the needle stopped moving then it would all be the same in the end...
     
  9. skillz2k5

    skillz2k5 Senior Member

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    ic ic... fortunatley never had the need/want to run a comp test before this so just wanted to make sure everything was done correctly. Thanks for all the help guys!
     
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