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85hp Johnson v4 Compression #'s ?

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  • 85hp Johnson v4 Compression #'s ?

    So I did the compression test as outlined above I have only had this motor for about a month and havent had a chance to put it in the water as there is about 8" of ice standing between me and it I was just wondering if these #'s sound good or about average for a 1975 85HP Johnson V4 engine.

    Cylinder #1 115PSI
    Cylinder #2 116PSI
    Cylinder #3 119PSI
    Cylinder #4 120PSI

    Thanks for the info guys!
    http://s1238.photobucket.com/albums/ff481/FJ_Russi/


  • #2
    Re: 85hp Johnson v4 Compression #'s ?

    Sound great to me. From what I understand, the actual numbers are not really that important as the testers aren't real accurate in that regard but they ARE consistant. Yours being over 100 and so closely matched is a very good thing.
    1976 18' Starcraft SuperSport 90HP Evinrude
    Restoration thread http://forums.iboats.com/showthread.php?t=357767
    1966 16' Starcraft Jupiter 85HP Johnson
    Restoration thread http://forums.iboats.com/showthread.php?t=338633 sold

    Comment



    • #3
      Re: 85hp Johnson v4 Compression #'s ?

      Thanks EZ! I was looking for factory #'s just out of curiousity but I coudn't find any.
      So the Starmada does venture out into the world of Iboats. I thought we all just hung out there like a cult or something
      http://s1238.photobucket.com/albums/ff481/FJ_Russi/

      Comment



      • #4
        Re: 85hp Johnson v4 Compression #'s ?

        Nah, I'm just stalking you
        1976 18' Starcraft SuperSport 90HP Evinrude
        Restoration thread http://forums.iboats.com/showthread.php?t=357767
        1966 16' Starcraft Jupiter 85HP Johnson
        Restoration thread http://forums.iboats.com/showthread.php?t=338633 sold

        Comment



        • #5
          Re: 85hp Johnson v4 Compression #'s ?

          LOL Well I guess thats cool. I mean I always visioned my stalker being 120lbs blonde hair blue eyes and female but maybe we can work something out.... Your not far off that right EZ??
          http://s1238.photobucket.com/albums/ff481/FJ_Russi/

          Comment



          • #6
            Re: 85hp Johnson v4 Compression #'s ?

            There are no published factory #'s that I know of. As long as they are 15 psi with in each other should be okay. Last time I seen a spec published was in a 1967 Evinrude snowmobile service manual.

            Comment



            • #7
              Re: 85hp Johnson v4 Compression #'s ?

              ok well then looks like I'm good to go. I was Just do some routine checks and dreaming of spring. Thanks for the info Boobie!
              http://s1238.photobucket.com/albums/ff481/FJ_Russi/

              Comment



              • #8
                Re: 85hp Johnson v4 Compression #'s ?

                That engine when new probably had close to 125 lbs compression, so your current numbers are just fine. Also, it is not unusual for the compression to vary a few lbs from one head to the other, due to the way the blocks were machined at the factory. Looks normal!

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