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BRINGING IT ALL TOGETHER.... A's, G's & E's


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67a 100 pickup
benwah
6 posters

    v8 compression

    benwah
    benwah


    Number of posts : 1135
    Location : the land of broken dreams and shattered hopes CT
    Registration date : 2008-07-05

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    Post by benwah Sun Nov 14, 2010 2:49 pm

    Ya Finally did a compression on my 65s 273 #1 150 #3 130 #5 130 #7 125 #2 135 #4 115 pale #6 130 #8 150. So the engne is gettin yanked out! Have a 318 Im plan on replacing with. #1 165 #3 165#5 180 #7 160 #2 180 #4 175 #6 180 #8 160. What is the compression on a new stock engine?
    67a 100 pickup
    67a 100 pickup


    Number of posts : 1319
    Location : ann arbor, mi
    Registration date : 2009-01-29

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    Post by 67a 100 pickup Sun Nov 14, 2010 3:52 pm

    Compression pressure with engine warm and plugs removed, throttle wide open 125-155 psi Max variation is 25 psi. This is out of my '68-70 service book under the SPEC's in the back.
    benwah
    benwah


    Number of posts : 1135
    Location : the land of broken dreams and shattered hopes CT
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    Post by benwah Mon Nov 15, 2010 8:49 am

    Ok thanks!
    kltcustoms
    kltcustoms


    Number of posts : 199
    Location : Idaho
    Registration date : 2008-07-07

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    Post by kltcustoms Wed Feb 23, 2011 5:36 am

    How does one fix the compression problem? I am sorry for takeing over this thread but I had a simular question.

    This new motor I have the compression is ( according to the guy who did the test) between 115 and 125. What can you do besides a total rebuild?
    Twinpilot001
    Twinpilot001


    Number of posts : 6186
    Location : spokane ,Wa.
    Registration date : 2009-09-28

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    Post by Twinpilot001 Wed Feb 23, 2011 5:54 am

    If cylinders arnt scored-??????????? just do a very lite hone job & install new rings= but ur still into a teardown- also that compression isnt bad at all- and are u taking the word on that compression from the seller?? Check it yourself? You wont really know unless you test it yourself or teardown the motor.


    Last edited by Twinpilot001 on Wed Feb 23, 2011 7:31 am; edited 1 time in total
    Twinpilot001
    Twinpilot001


    Number of posts : 6186
    Location : spokane ,Wa.
    Registration date : 2009-09-28

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    Post by Twinpilot001 Wed Feb 23, 2011 5:56 am

    Might add = the best ways to test is with a leak down compression tester - OK now ive said that - come on all you aircraft guys=Smile)
    RodStRace
    RodStRace


    Number of posts : 3046
    Location : Chino Valley
    Registration date : 2010-01-21

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    Post by RodStRace Wed Feb 23, 2011 7:27 am

    Depends on what is leaking the compression. Rings or valves can drop a little, hole in the piston, blown head gasket or cracks in the block or head leak more.
    leak down is the way to diagnose, but you will have to pull it apart in any case.
    Twinpilot001
    Twinpilot001


    Number of posts : 6186
    Location : spokane ,Wa.
    Registration date : 2009-09-28

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    Post by Twinpilot001 Wed Feb 23, 2011 7:34 am

    Ill add Kent= the best comp =test will be with the engine warmed up=usually to operating temps.
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    Guest
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    Post by Guest Wed Feb 23, 2011 12:29 pm

    if its been sitting, put some oil in each cylinder and crank the pig over, drink a nice cold sweet tea then check it again. 115 isnt terrible change the oil and add some restore.
    Twinpilot001
    Twinpilot001


    Number of posts : 6186
    Location : spokane ,Wa.
    Registration date : 2009-09-28

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    Post by Twinpilot001 Wed Feb 23, 2011 1:44 pm

    remember -that restore stuff is a cleaner also will swell the front & rear main seals in time- get ready to replace them when they start leaking.
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    Post by Guest Wed Feb 23, 2011 6:46 pm

    started using it at 180k in my toyota 4 runner 3.slo its at 253k now and no leaks yet. that being said i always say there is no chemical solution for a mechanical problem, but that stuff is helping keep my yoda goin. of course its about rusted off the dang frame but the pig still lives. Laughing
    Digz
    Digz


    Number of posts : 3794
    Location : United States Six Lakes MI
    Registration date : 2008-05-17

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    Post by Digz Wed Feb 23, 2011 7:47 pm

    Yeah ,,115=125 on a starter roll isnt that bad, put some oil in the cylinders and see if it comes up any.

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