One Carb Question?
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One Carb Question?

  1. #1
    Senior Member Widetrack's Avatar
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    Default One Carb Question?

    I have a set of 1050 Dominators on my 555 that run progressive linkage! Right now they are set up on super progressive 60% primary throttle is used before secondaries open! If I change this over to a 1=1 linkage will I need to lower my jetting to compensate for the secondaries opening sooner?

    The reason I am looking into this is because my plugs look to rich on the primary side (right bank) and look great on the other side! Not the best fuel distrabution.
    Last edited by Widetrack; 10-02-2012 at 04:34 PM.


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  3. #2
    steelcomp was here
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    Quote Originally Posted by Widetrack View Post
    I have a set of 1050 Dominators on my 555 that run progressive linkage! Right now they are set up on super progressive 60% primary throttle is used before secondaries open! If I change this over to a 1=1 linkage will I need to lower my jetting to compensate for the secondaries opening sooner?

    The reason I am looking into this is because my plugs look to rich on the primary side (right bank) and look great on the other side! Not the best fuel distrabution.
    Are you reading clean plugs at WOT? The progression of your linkage shouldn't effect the plugs if the carbs are transitioning properly, but here's the deal...with sideways mounted carbs you should be running 1:1.
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    Senior Member TNYoungblood's Avatar
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    Even on a lake cruiser Steel ????
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    Quote Originally Posted by TNYoungblood View Post
    Even on a lake cruiser Steel ????
    Ideally yes, but that's hard to do with 4150's. As I said, the part throttle air/fuel shouldn't be a lot richer on one side of the carb than the other allthough there were some older 3 circuit Holleys that were terribly rich at part throttle. With progressive linkage, you're going to see more air/fuel on one side of the engine than the other, but it shouldn't look "richer" if the carbs are tuned right.
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    Senior Member TNYoungblood's Avatar
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    My shits fat but I've herd on a pump gas deal that could be a good thing

    Not bad fat but my pipes are alittle black. I did go up on all my air bleeds and that seemed to help.

    Runs great so I hate to mess with it.

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    gn7
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    I agree with Steel Its more of fuel delievery curve than the fact that the carbs are mounted sideways. It is better have the carbs 1 to 1 on a t ram, but its not critical. I've ran both ways with no real issues. We originally ran the GN with 1 to 1 because of the "horror stories" of progressive carbs running lean on one side. It has run soft progressive with sideways Doms for 9 years now because its easier to drive.
    If your way rich in your part throttle delievery, it will show up on one side. Its not that the other side is lean, its that your dead fat on the primary side at part throttle.
    Like Steel said, 3 circuit Doms can be incedably fat at part throttle. A fat intermediate circuit may be your problem. I wouldn't be one bit suprised if you changed the linkage and you were fat on both sides at part throttle, with no other changes.



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    Last edited by gn7; 10-02-2012 at 05:36 PM.

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    Senior Member Widetrack's Avatar
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    The carbs are tuned well and I have checked them with an EGT in all ranges of rpm! The plugs would look good on a wot pass. I was just thinking that 1-1 may even the distribution. The mid range before opening the secondaries goes to a lean condition with is cruise range. 2500-3000 rpm range.


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    gn7
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    If you look at how a carbs butterflies open, they open inside of the blade dipping into the manifold and the outside going up. The majority of the air passing thru the carb at part throttle goes down the "slope" of the blade as opposed to "wrapping around" the blade on the outside. The majority of the air entering the manifold comes from the center of the carb, and if anything it aimed at the opposite side. Even the air that goers "under" the blade whats to follow the blade angle as it leaves the carb. If your rich on one side, I really doubt going to a 1 to 1 will help. It might, but I would be surprised. The linkage is realitively cheap.
    Be perpared to see you fuel curve change. You'll be asking the same air volume you pass at 1/4 throttle before, to be spread across 8 venturi all at 1/8th or less. My gut says you have a pig rich engine at the same RPM your cruize at now. You can fix it. But I think it will need you to make some adjustments. I doubt it will be a plug and play fix to you problem,



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    steelcomp was here
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    Quote Originally Posted by Widetrack View Post
    The carbs are tuned well and I have checked them with an EGT in all ranges of rpm! The plugs would look good on a wot pass. I was just thinking that 1-1 may even the distribution. The mid range before opening the secondaries goes to a lean condition with is cruise range. 2500-3000 rpm range.
    What carbs are these?
    1:1 will definitely even the distribution but I think you're makin more out of it than you need to. I know, though, ...that brain of yours is always thinkin....
    What's telling you you're rich on one side, and how rich?
    Last edited by scott foxwell; 10-02-2012 at 07:17 PM.
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    "Need For Speed" Gearhead's Avatar
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    WT,

    Are the carbs jetted square?

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    Quote Originally Posted by Gearhead View Post
    WT,

    Are the carbs jetted square?
    Was wondering the same thing...my guess is, doubtful.
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  14. #12
    gn7
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    Quote Originally Posted by steelcomp View Post
    Was wondering the same thing...my guess is, doubtful.
    Surely you jest! I know, I know. Stop calling you Surely. But really. We're talking about a T ram and dual Doms here. Whats next, PVs?



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  15. #13
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    The carbs are Pro Systems they were jetted 88 square, right now I am running 86 front and 87 backs! No P/Vs! When we ran this motor on the dyno with the 88s it showed a 12.0 on the A/F so we jetted to 86s (only other size we had at the time) and the A/F went to 12.5 or so! In my thinking (I know bad thing) I was trying to step the fuel up in the upper mid range to pull it to the richer side towards WOT! I even tryed to run 89 square and it would eat a set of plugs in one outing! I am close on jetting and have thought about going a square set of 85s and see what it does! I can also change the linkage to a med. progressive @ 40%=1 and pull the seconds in alittle sooner if that may help!
    I just thought that the sideways carbs were loading the right bank and 1=1 may or would fix the distrbution and even it up some! Thats why I asked if I would need to change jetting, up or down if I went to 1=1!


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  16. #14
    Senior Member Widetrack's Avatar
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    Bob, the mid range seems to be on the lean side! Not fat at all! Matter of fact I cringe at how lean it gets at part throttle! All air bleeds are square and I tuned for best idle and mid performance! Gearhead and I talked about this a year or so ago and I had to feel my way around these carbs to get the best low and mid range performance! WFO is a given to work as long as the jets are correct!

    I don't think my 86 and 87 jets are causing the problem, or are they?
    Last edited by Widetrack; 10-03-2012 at 05:04 AM.


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