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Thread: Dual webber upgrade

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    Default Dual webber upgrade

    Hi, I have just begun restoring my grandfather's 73 240 (that I grew up driving too) and I wanted to upgrade from the round tops to the dual webbers. I have the chance to get a used pair without the linkage. How hard is that to find or can I use any of the SU linkage? Any help would be great.

    Shaun
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    Nova Scotia,Canada,Earth Blue's Avatar
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    Hi Shaun, that is a nice project! The car looks well cared for too.

    You can get the linkage at pierce manifolds. Here is a full kit: ADAPTOR/MANIFOLD
    99002.831



    You may wish to consider triple side draft Webers rather than dual down drafts. They perform much better. You can buy complete kits at Pierce or buy used kits on Ebay or this forum's classified ad for half the price of new: WEBER CONVERSION
    K659



    FYI: http://www.classiczcars.com/forums/c...eber-dgvs.html
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    Supporting Member Zedyone_kenobi's Avatar
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    I would agree with Blue here.

    The triple weber conversion may seem intimidating, but it is a great project to tackle that will yeild good results. The forums here have many a great educational links for the Weber conversion, and they are getting better every day.

    I would also strongly suggest getting some round tops from Ztherapy and just leaving everything else stock. Functional round top SU's are WONDERFUL carbs.
    1971 240Z HLS30-38691
    93.9% done and getting better every day
    Now with 100% more DATSUN SPIRIT L28 Power
    1968 Datsun 2000 SRL311-03416

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    Registered User Kurbycar32's Avatar
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    I have the dual webers and while I consider them serviceable (some people here dont even think that), I dont think its an "upgrade". If you have SU's you should fix them, or upgrade to the triple side draft webers but that isnt a cheap project.
    Early 1974 260z
    https://sites.google.com/a/thecomputerrehab.com/260z/

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    Great info, thanks! I have read many a happy testimony on Ztherapy carb work. Perhaps I will start there since my goal is to keep as stock as possible. I do need new exhaust, though. Any suggestions on whether the 6:1 or 3:2 would be the way to go if I keep the SUs?

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    Registered User olzed's Avatar
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    Keep the SU's, and your money.
    The SU's are great for street performance.

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    Supporting Member Zedyone_kenobi's Avatar
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    The header is nice to have, but if your stock manifold is in good shape, get it cleaned up and reuse it. It will function just fine with your stock engine and SU's. You will not notice any huge HP increase with Headers. Again, save your money for something else. Like suspension or brakes.
    1971 240Z HLS30-38691
    93.9% done and getting better every day
    Now with 100% more DATSUN SPIRIT L28 Power
    1968 Datsun 2000 SRL311-03416

  8. #8
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    Sage advice. I just remember how awful the SUs were growing up but then we updated to the round tops and it was a bit better. Very hard-starting and such. I will contact the therapy folks and keep the manifold. Thanks!

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