Stacy: R-Max Vs CSC & carb questions need answers

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Viewing 15 posts - 16 through 30 (of 44 total)
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  • #49540
    larry toby
    Participant

    I feel similar to Rich. If it is possible (legal) to run both events together I’m all for it. Racing is more fun with more karts. It doesn’t bother me that some karts are scored differently and may impact the final results. I would rather have an epic battle with someone even with the potential for a dnf than simply circle the track and get easy points. Let’s race.

    #49541
    Tom Dennin
    Participant

    Stacey,

    What is wrong with Sat. morning for the RMC? I believe that it would leave almost eight hours for test and tune later that day.

    I think it would make a point that it pays to own a Rotax. 😀 It would encourage more people to sign up and run the RMAX series at GJMS and make it more affordable as Rich has pointed out in the long run. :cheers:

    If you run them together, then what should those karters who want to score maximum points for both the CSC and RMC do? You either set your kart to run RMC rules and be at a disadvantage to the other TAG karts or run TAGUSA/SKUSA rules and earn no RMC points. :idn:

    Saturday seems to make the most sense. :sun:

    Tom

    #49542
    cgordon
    Participant

    Doug, thanks for the info on the carb. Tom, by carb top I was referring to the black cap that screws on the top of the carb. Some vendors have been selling a different top which allows diiferent slides in the Rotax Dellorto carb and supposedly also increases flow. I consider that illegal and apparently, from Doug’s comments, it is.

    I’d love to see a Saturday RMax race at GJMS with the CSC. I would definitely enter that. Thanks for considering our ideas, Stacey.

    #49543
    Tom Dennin
    Participant

    Charles,

    I do not believe that what has been said is correct.

    As per the TAGUSA rules section “2.2. CARBURETORS – As supplied from the manufacturer, jetting open.”

    My understanding was that the body of the carburetor must not be physically altered. Other than that the carb is open. The original cap and spring for the Rotax is a joke. That big spring and cap that if you turn to hard on it will crack. Mine cracked for no apparent reason at all.

    My understanding is that the cap, spring, slide, the sleeve which the slide fits, atomizer, emulsion tube, inner pilot jet, outer pilot jet, floats, needles, starter jet ( I am not sure if that is what it is called), and main jet can be altered. In other words anything that attaches to the carb and that would include the cap.

    Tom

    PS-> Just another thought, if everyone agrees that changing the slide is within the rules then wouldn’t the slide, spring and cap be all one part
    (ie. “the slide”) . They are sold as one unit and once more they were designed to go together. I take this as simply a jet change which is within the rules.

    Remember this, I ask all of these question so I can be sure to be within the rules. I do not believe in using ignorance as an excuse.

    #49544
    cgordon
    Participant

    Tom,

    I dunno – it seems to me like changing the cap or even the slide is a stretch of the term “jetting”. I don’t know who is right, but the fact that you, Doug, TAG Usa and myself have read this rule in different ways indicates this is a grey area. That’s why I asked the question in the first place. I hope that CSC gets a tech “goto” person from whom we can get definitive answers on questions like this.

    Charles

    #49545
    Tom Dennin
    Participant

    Charles,

    It looks pretty obvious from the new SKUSA/TAGUSA rules that the cap along with every other thing that has to do with fuel metering is legal to change. The 2005 rule is a little more explanitory than it was in 2004. Never-the-less, the verbage in the carb rule leaves much to be desired!

    This will tell you how very little I use to know about a carb. About a year ago, Accelereation karting explained to me that the slide is a jet before then I had no idea that it could even be changed or that there was something to change it too. 😯

    Tom

    #49546
    Superslow
    Participant

    Tom you seem to be the only one that thinks jetting refers to anything other than jets and fuel metering components. I would completely disagree with your interpretation.
    Personally I do not see how jettign can include a slide which changes teh flow around a diffuser, if so, why is the venturi which does the same thing not legal as well.
    I think we all need to get a clarification on this from our proposed technical scrutineer (whoever that is).

    #49547
    Tom Dennin
    Participant

    Here is the worst answer I can give you, but the only one that I have. I was told the slide is considered a jet and all across the good ole USA karters are changing the slide. The slide effects the air flow which in turn effects the fuel metering. The rules for TAGUSA consider the slide a tunable/changable part. I do not think there has been any questioning of that issue. :sun:

    I will tell you that I know very little about the carb and what exactly each individual component does, but I have been investigating, researching, and learning over the winter.

    Tom

    #49548
    Tom Dennin
    Participant

    One other thing, if I happen to say something that doesn’t make sense regarding the carb and its functioning components remember that I am still learning and please let me know. Otherwise, I will never know. 😀

    Tom

    #49549
    Mike Jansen
    Participant

    Tom,

    Don’t forget that you CANNOT change the fetzer valve, that’s a sure DQ if i ever saw one.

    #49550
    Superslow
    Participant

    Tom if you want to learn about the dellorto I have a very good explanation document I will send to you if you PM me with your e/m address as it is a very big file.

    #49551
    Joe Rosse
    Participant

    That sounds quite handy–is there any way it could be posted to the site for downloads?

    #49552
    Angie MacEwen
    Participant

    I am working on putting together a Tech section. Tech advice, links to helpful info, etc. So if anyone has anything like that, send it my way.

    angie

    #49553
    Anonymous
    Inactive

    Superslow, I will be happy to place it on my site so everyone can download it, until Angie gets a chance to do the tech section. You can mail it to zgdesignATstarbandDOTnet ( avoiding e mail harvesters)

    Richard

    #49554
    Doug Welch
    Participant

    Tom and Charles

    I talked with Marty Casey today about this topic. He comfirmed what I had thought. We can swap out those parts that are commonly used in jetting, the main jets, pilot jets, needles, difusers or emulsion tubes, slides and needle and seats. They must be Delorto parts and they can not be altered in any way. The use of any after market parts would not be legal. I asked spcifically about the cap and spring and he said they should be stock OEM unaltered parts. So the use of the after market cap and spring would not be legal under Tag USA rules. Basically we can make the same changes that an ICC motor can make.

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