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Correct Compression For '62 Cj-5 F134

Discussion in 'Early CJ-5 and CJ-6 Tech' started by Tom Stephens, Apr 10, 2019.

  1. Apr 10, 2019
    Tom Stephens

    Tom Stephens New Member

    Arnold, CA
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    My compression readings: #1 = 106, #2 = 106, #3 = 105, #4 = 109

    Too low, or just fine?

    Tom
     
  2. Apr 10, 2019
    PeteL

    PeteL Member Sponsor 2019 Sponsor

    Hills of NH
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    Not too bad for a used f-head. The good news is that they are all very close to the same.
     
  3. Apr 10, 2019
    colojeepguy

    colojeepguy Colorado Springs Sponsor 2019 Sponsor

    At the foot of...
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    ^ I agree with Pete, the even numbers are good news!
     
  4. Apr 11, 2019
    Tom Stephens

    Tom Stephens New Member

    Arnold, CA
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    I agree about the even numbers. I wonder if rebuilding would help the power output?

    Tom
     
  5. Apr 11, 2019
    PeteL

    PeteL Member Sponsor 2019 Sponsor

    Hills of NH
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    It's an F-head. What power output?
     
  6. Apr 11, 2019
    Howard Eisenhauer

    Howard Eisenhauer Super Moderator Staff Member Sponsor

    Tantallon, Nova...
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    New would be in the range of 120-125, bad would be 80-90. If you're not burning oil I'd drive like I stole it.:D
    Not noticeably.
     
  7. Apr 11, 2019
    Tom Stephens

    Tom Stephens New Member

    Arnold, CA
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    Pete,

    That's :)

    Howard, it spills oil, it doesn't burn it ;-) I was checking the oil canister to see if it had a filter inside (so I could order a new one), and didn't get the gasket straight, it got oil EVERYWHERE, all over the engine, even in the passenger compartment.

    Perhaps I should start a new thread, let me know if I should, but I'll try this here: I found some old threads on replacing the carb (I have a Solex) with a Weber 32/36, or changing the ignition or doing both to get more power. I know "power" is not really the word, but I'd like to get 50-55mph up one of our 3-4% grades. I was doing 45mph the other day.

    Tom
     
  8. Apr 11, 2019
    PeteL

    PeteL Member Sponsor 2019 Sponsor

    Hills of NH
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    Cruising at 45mph is just right for an F-head, as frequently discussed here. They were intended for off-road applications and their design precludes any easy power upgrades.

    Hell, I have trouble getting 55mph out of my '88 YJ, on any noticeable uphill. Jeeps have the aerodynamics of a brick.

    Make your second Jeep a V6 and use that one on the highway.
     
  9. Apr 11, 2019
    Howard Eisenhauer

    Howard Eisenhauer Super Moderator Staff Member Sponsor

    Tantallon, Nova...
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    BTDT :(
     
  10. Apr 11, 2019
    PeteL

    PeteL Member Sponsor 2019 Sponsor

    Hills of NH
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    Blew a cartridge filter clean off my M-715. Rustproofed that engine bay! And twenty years later you can still see the stain on the side of the house.
     
  11. Apr 13, 2019
    70cj5134f

    70cj5134f Member

    East Tn
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    55 up slight grade, ant going to happen.
     
  12. Apr 14, 2019
    Jrobz23

    Jrobz23 Member

    Northern, WI
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    Gauge calibrated?
    Valves checked?

    They seem close.
     

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