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Jet sizes?

  1. #57
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    Quote Originally Posted by gn7 View Post
    how the hell did I miss that one, on this sight or HB.Ya just know it had to be classic
    Oh yes it was a real classic, LOL. I think it was before you came on, or you would have definitely seen it!..

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  3. #58
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    Quote Originally Posted by gn7 View Post
    Actually Rocket, you have it a little backwards there. except on newer (read smog) carbs the idle screws adjust the fuel
    OK lets get back to SKM problem, if it's not due to him having a carb that Holley designed for a lumpy ass cam ( the real reson for having 4 corner idle)
    or his throttle blades aren't to far open and taking the carb "off" the idle circuit and on to the transfer which literally kills the screw adjustment capabilties of the idle circuit, there is one more thing. If the carb is BRAND NEW or resently rebuild by someone that knows, then take off your scoop/air and squirt the living hell out of ALL the air bleeds with carb cleaner, if these get blocked the idle and/or the main will dead rich. My money says he has a cam or maybe a dual plane manfold, that is sending the carb a stronger vac signal than Holley had intended and he will just have to run it with screws turned in. So what.
    It is a big lumpy cam and I think you may have hit it on the head if a dual plane intake can cause the problem. I actually have a single plane intake on the way to replace my crappy dual plane that I was using temporarily. I didn't know it could cause something like this?

    Quote Originally Posted by 058 View Post
    The tread did get a little off topic but still entertaining.
    no problem, It got interesting

    Quote Originally Posted by Rocket-J View Post
    Hi Bob. Good to here from you.
    All of you fellas out there are confusing me with big fancy terms. I think the original problem was that his engine rpm would increase as the idle screws were screwed all the way in. All the idle screws do is shut off an air flow. His condition would suggest that there might be a vacuum leak in his system, such as carb base or intake manifold. Check it out. Al

    No vacuum leaks on there!

  4. #59
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    bet when you put on the single plane, you'll have to back out the screws a little, yeah it makes a differance. and you are prolly going to have to rejet too. The dual plane just creates a stronger signal at the carb.



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  6. #60
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    Quote Originally Posted by 058 View Post
    Its either this or American Idol......what would you do? Besides, Lest you forget this is the same bunch that did 10 pages discussing a prop nut.
    Put that way, I'd be here too.
    LMAO

  7. #61
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    Quote Originally Posted by Some Kind Of Monster View Post
    How did I know that was coming?

    Well Art if you have some extra injectors laying around that you would like to donate to my cause, I am a very worthy candidate! Thank you for your consideration!
    Ya right






  8. #62
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    Quote Originally Posted by gn7 View Post
    bet when you put on the single plane, you'll have to back out the screws a little, yeah it makes a differance. and you are prolly going to have to rejet too. The dual plane just creates a stronger signal at the carb.
    We'll see how that goes. All I have on there right now is a performer 2-0 so hopefully a new intake will help the issue. I'm debating between a dart single plane and a dual tunnelram. I guess that's a whole new can of worms

    Quote Originally Posted by PlacecraftTunnel View Post
    Ya right





    It was worth a try!

  9. #63
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    Quote Originally Posted by Warp Speed View Post
    I hope we know a little more about carburetors today than we did in the "early 70's"
    Read it again. Thats when I started experimenting with Holley's..... and your right, and after over 30 years we know a lot more today. You guys have fun debating, I've got work to do.
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    Senior Member PlacecraftTunnel's Avatar
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    Quote Originally Posted by Some Kind Of Monster View Post
    We'll see how that goes. All I have on there right now is a performer 2-0 so hopefully a new intake will help the issue. I'm debating between a dart single plane and a dual tunnelram. I guess that's a whole new can of worms



    It was worth a try!

    Have you got it figured out yet?







  11. #65
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    Quote Originally Posted by PlacecraftTunnel View Post
    Have you got it figured out yet?
    Nope,
    You wana help me decide? A friend offered me a polished Weiand TR with a Dooley scoop for $350. I already have the carbs but they need to be rebuilt. Or I can take the Dart single plane for about $300 and I have this fresh rebuilt 850 to slap on top. May I present, my dilema...

  12. #66
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    Quote Originally Posted by BDMarine View Post
    Read it again. Thats when I started experimenting with Holley's..... and your right, and after over 30 years we know a lot more today. You guys have fun debating, I've got work to do.
    Thought maybe you could explain what was happening.

    Not really debating, just trying to explain what circuits do what. It is all pretty simple. Like what has been stated by a few during this, if the powervalve rating is affecting idle AFR there is something else wrong.......that's all.

  13. #67
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    I think it has been very well explained but to add my recent experince to this. I just built a 350 ci motor for my chevelle and the car would not idle for beans with the same carb and set up that was on the stock 350 motor. It was always dead rich at idle and cruise on this new motor, and I tried every combo of jets I could imignine. Then thought of the PV and measured my vacuum. Turns out I had only 6 inches at idle and the PV was a 8.5 Bought some PVs lower than 6 and walla, brought the air fuel ratio both at idle and cruise right on in according to the wide band O2 meter!!
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  14. #68
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    The fact that it fixed your cruize is exactly what the PV is suppose to do. The fact that it fixed the idle isn't. If the power valve is wide ass open the main well/circuit can only see this as a jet increase of 6-10 sizes, the PV channel goes straight from the PV to the main well. So your saying that jetting up will affect your idle. Thats never happened to me. So I have to believe some thing else is affecting the idle when made the change, gasket leak or small pin hole in the diaphram?



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    Last edited by gn7; 03-12-2008 at 05:37 PM.

  15. #69
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    Quote Originally Posted by Some Kind Of Monster View Post
    Nope,
    You wana help me decide? A friend offered me a polished Weiand TR with a Dooley scoop for $350. I already have the carbs but they need to be rebuilt. Or I can take the Dart single plane for about $300 and I have this fresh rebuilt 850 to slap on top. May I present, my dilema...
    The Dart and the 850, but it'll cost you at least 15 bling MPH.

  16. #70
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    Quote Originally Posted by SmokinLowriderSS View Post
    The Dart and the 850, but it'll cost you at least 15 bling MPH.
    But I want it to be a 100mph Ebay boat, not a 90mph ebay boat

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