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Thread: Carbs setup

  1. #1
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    Default Carbs setup

    ok my car running a it rich and i wasn to recheck the setup to make sure my setup it right, how is the needle setup exactly? with pics mabey? the haynes manual i have show what looks like a groove on the bottom of the piston should the needle be flush with that groove or the surface? or am i just plain wrong?(cant remember what the bottom of mine look like ) the needles and nozzles are ztherapy..

    also the float adjust ment should be 1/2 inch from the inside top of the float chamber or the lip where the gasket seats?
    74 260z Drivin daily Slowly fixing up

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    Default

    I would suggest the shoulder on the needle be even with the bottom of the piston. The variation can be taken out with the mixture adjustment on the nozzles but if you're running rich it's probably best to get up into as much fat on the needle as you can.

    Rich can also be a function of float level and because of that little spring inside the needle (in the needle and seat) in the float bowl, I think it's easy to get that set incorrectly. When all is said and done, I take the domes off and pistons out and look down in the nozzle orifice and "see" where the level of the fuel is.

    Keep in mind, I'm the sales guy and not the carb guy in this august organization and a life long subscriber to the KISS theorem in all matters mechanical.......

    I would also throw out that if you wanted to take a drive to Salem some weekend, I'll bet you that Steve would be happy to help you get those bad boys dialed in. We're generally around the shop playing cars Sat & Sun. Call me to set something up. 503-587-9800
    Bruce Palmer
    Salem Or
    Sales@ztherapy.com
    www.ztherapy.com
    503-587-9800

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    Default

    Doh No Picture
    74 260z Drivin daily Slowly fixing up

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    Like this ?? (excuse the poor rendition i cant draw it even worse with a mouse )
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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    74 260z Drivin daily Slowly fixing up

  5. #5
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    Even with the bottom flat surface of the piston (not the groove)......

    Our Just SUs video takes a whole lot of the black magic out of the subject of SUs and how to get them right....... Just a thought.
    Bruce Palmer
    Salem Or
    Sales@ztherapy.com
    www.ztherapy.com
    503-587-9800

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    ok i had them even with the groove at first fixed now,

    im going to get the video here as soon as i get some extra money.
    74 260z Drivin daily Slowly fixing up

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    Originally posted by Bruce Palmer
    Even with the bottom flat surface of the piston (not the groove)......

    Our Just SUs video takes a whole lot of the black magic out of the subject of SUs and how to get them right....... Just a thought.
    Where is this video located? I rebuild carbs as my day job, and the import guys at my work do not like tuning them or rebuilding them, so I was thinking of doing it myself in my free time, wouldn't take all that long, and I am looking for something to help me learn about them seeing I have access to almost unlimited amounts of new gaskets, jets etc. Thanks.

    -Chris (Ben's (The Owner)'s Mechanic)
    HLS30 - 35515

  8. #8
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    The JUST SUs video can be had from www.ztherapy.com (ZTV09) or call me at 503-587-9800 to order. The infrmation is a lttle dated as it relates to our current production but for learning the inner workings and theory of the SU, it's killer information.
    Bruce Palmer
    Salem Or
    Sales@ztherapy.com
    www.ztherapy.com
    503-587-9800

  9. #9
    WESTCOASTZRACER Chino 240Z's Avatar
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    Hey Bruce,
    I bet if you brought a case of those Videos to the MSA show, you'ld be able to sell everyone! My favorite part is the end of the second tape, the Z out on the track overtaking car after car! and the footage of inside the SU at W.O.T. on the dyno!
    Now I just gotta a get a roll bar camera mount for ours.
    Cheers, Craig

  10. #10
    WESTCOASTZRACER Chino 240Z's Avatar
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    Hey Bruce,
    I bet if you brought a case of those Videos to the MSA show, you'ld be able to sell everyone! My favorite part is the end of the second tape, the Z out on the track overtaking car after car! is that Steve? what track is that? oh and the footage of inside the SU at W.O.T. on the dyno!
    Now I just gotta get a roll bar camera mount for ours.
    Cheers, Craig
    Last edited by Chino 240Z; 03-26-2004 at 10:28 AM.

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