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Carburetor Questions?

Discussion in 'Early CJ5 and CJ6 Tech' started by sparky, Oct 4, 2006.

  1. Oct 4, 2006
    sparky

    sparky Sandgroper Staff Member Founder

    Perth, WA
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    Not a cross post from the flatfender section, well, those guys have different carbs so they have different issues I'd think.

    I need some common questions and hopefully answers.

    I'm working on my talk for Sat. in Jeff City. If you have an example of questions common to flatfender carbs it would help me.

    Any suggestions? I already cover vacuum leaks. :oops: R)

    I'm trying to keep it fairly generic, not wanting to get too specific but if I do it probably won't be on the 2G (which works against me).
     
    sparky, Oct 4, 2006
    #1
  2. Oct 4, 2006
    tomcam

    tomcam Member

    Savannah Tn.
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    How much slop is to much in the throttle shaft?
     
    tomcam, Oct 4, 2006
    #2
  3. Oct 4, 2006
    sparky

    sparky Sandgroper Staff Member Founder

    Perth, WA
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    Ah, I saw that, oh, it's on the 3B page. :)

    I'll include that. YF???
     
    sparky, Oct 4, 2006
    #3
  4. Oct 4, 2006
    BlueFlu

    BlueFlu past owner of some ecj5's

    Hermitage, TN
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    Base line set up. Idle, mixture settings etc.
     
    BlueFlu, Oct 4, 2006
    #4
  5. Oct 4, 2006
    BlueFlu

    BlueFlu past owner of some ecj5's

    Hermitage, TN
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    How to win the gold medal in the carb throwing contest? :D
     
    BlueFlu, Oct 4, 2006
    #5
  6. Oct 5, 2006
    sparky

    sparky Sandgroper Staff Member Founder

    Perth, WA
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    Glad I don't ask for real help around here very much.
     
    sparky, Oct 5, 2006
    #6
  7. Oct 5, 2006
    sternbal

    sternbal Member

    Nashville, TN
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    Not specifically about a carb, but you might want to emphasize the importance of correct timing and engine condition before attempting to make carb adjustments.
     
    sternbal, Oct 5, 2006
    #7
  8. Oct 5, 2006
    BlueFlu

    BlueFlu past owner of some ecj5's

    Hermitage, TN
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    :oops:
     
    BlueFlu, Oct 5, 2006
    #8
  9. Oct 5, 2006
    timgr

    timgr We stand on the shoulders of giants. 2022 Sponsor

    Medford Mass USA
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    Well, these questions don't come up unless there's something wrong, so I'd outline the talk around that - a systematic approach always helps.

    You'd think about the carb if you have either a) a sudden no-start/no-run condition, or b) the engine runs lousy; black smoke, rough idle, no power, hesitation, lousy mileage, others?

    No-start is the usual - gas or spark. You can assume you have spark, then talk about how the carb can go south suddenly, things like clogs, stuck float, bad fuel pump, OOG, others? I'm sure you can think of possible responses to all of these.

    Worn out or dirty or broken or misadjusted has another group of problems, that don't neccessarily stop you altogether. Here's where the throttle shaft comes in, and rebuilding or replacement. Since it's about flatties, you might mention the Solex as a possible fix. Those more familiar with the YF might have some suggestions here. On the intermediates board, we went through a couple of threads on the presence or absence of the YF accel pump lifter link seal - IIRC only the kit from The Carburetor SHop has it, and without it you'll get more or less of a leak depending on float level.

    hth!
     
    timgr, Oct 5, 2006
    #9
  10. Oct 5, 2006
    sparky

    sparky Sandgroper Staff Member Founder

    Perth, WA
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    R) I just need more coffee in the morning Jerry. ;)
     
    sparky, Oct 5, 2006
    #10
  11. Oct 5, 2006
    sparky

    sparky Sandgroper Staff Member Founder

    Perth, WA
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    That's how I've been outlining it Tim. :) Just wanting to make sure I'm not missing anything specific.

    I'll post a PDF of it here shortly.
     
    sparky, Oct 5, 2006
    #11
  12. Oct 5, 2006
    sparky

    sparky Sandgroper Staff Member Founder

    Perth, WA
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    Here's a Flash version of it, minus the animation which will make some slides difficult or impossible to read, but you'll get the idea.
     
    sparky, Oct 5, 2006
    #12
  13. Oct 5, 2006
    w3srl

    w3srl All-around swell dude Staff Member

    Port Orange, FL
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    Sparky, think about the old "bigger is better" syndrome when dealing with carbs. A dauntless only needs about 300 CFM at WOT @ 4500 RPM, and how often do we normally run at WOT? This is given about 80% volumetric efficiency and the fact that said engine is being run WOT.

    What happens in the "real world" is a 231/225 engine being run at 1000-2500 rpm which means that said engine needs only about 130 CFM at about 80% volumetric efficiency, which is pretty consistent with a "stock" engine. Keeping in mind that a Dauntless with a 55lb flywheel is almost NEVER going to see the 4500 RPM that kick the CFM factor up to ~ a whopping 235 CFM, Keep your money in your pocket, and spring for an MSD and a Pertronix instead IMHO.

    On the trails, just like on the street, TORQUE is king. Horsepower is for ricers IMHO.
     
    w3srl, Oct 5, 2006
    #13
  14. Oct 5, 2006
    sparky

    sparky Sandgroper Staff Member Founder

    Perth, WA
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    Most guys here will have military Jeeps or flat fenders. IF mine is there it'll be the exception with the V6. That's not stuff they're likely to care about from what I've seen of this audience.
     
    sparky, Oct 5, 2006
    #14
  15. Oct 5, 2006
    Executioner

    Executioner Member

    Reading,Pa, USA
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    Here's one to consider,I KNOW I TIGHTENED IT! (not shouting just stressing) A week after rebuilding my YF carb the float valve needle seat backed off enough to lower the float level and cause the engine to stall under load but would rev and idle fine. I had to get towed home and was particularly frustrating. Just thought I'd pass that along.
     
    Executioner, Oct 5, 2006
    #15
  16. Oct 5, 2006
    sparky

    sparky Sandgroper Staff Member Founder

    Perth, WA
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    Thanks. I'll probably include that as an example.
     
    sparky, Oct 5, 2006
    #16
  17. Oct 7, 2006
    chris_kolar

    chris_kolar New Member

    Texas
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    Here is a good question. How do you adjust the float? Get the float drop / shut off numbers from the rebuild sheet. Adjust the shut off and then adjust the drop independently of the shut off. Otherwise do not bend the float asm and throw the shut off out of adjustment. Only bend the drop tab to limit the drop. I rebuilt a rochester 2g today and had to remember how to adjust the float. It has been a few years since working on one. I used to have a 1971 gmc with the same carb style.
     
    chris_kolar, Oct 7, 2006
    #17
  18. Oct 7, 2006
    sparky

    sparky Sandgroper Staff Member Founder

    Perth, WA
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    Thanks Chris!
     
    sparky, Oct 7, 2006
    #18
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