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Thread: Fabricated Heat shield for weber triples

  1. #1
    Bloxman bloxman's Avatar
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    Default Fabricated Heat shield for weber triples

    Everything I have read says the DCOE's don't like heat.

    So I must have measured a thousand different things, like carbs to brake lines,and brake booster to rear carb, carbs to top of headers.
    But..somehow I managed to take the filter off my breather pipe,to do the measuring ;so now I need to cut the breather down and to locate the filter closer to the block.

    Good Idea / Bad Idea?

    In addition to my Z, I have a Jensen Healey with a pair of zenith Strombergs, they leak sort of spontaniously, and a surprising volume.

    I don't know if Webers have any annoying habits that can get ya killed so..
    I designed the shield to slope down toward the radiator and away from the carbs and into a little trough which would guide any stray gasoline out between rad and a/c compressor.

    Enviromental disaster I know, but better than being blowed up!

    The Webers run cool now ,if I could only figure what I'm doing wrong in tuning ....

    Bloxman
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    1975 280Z
    P-30 Block,E88 head
    E12-80 Distributer Upgrade
    ZX Alternator Upgrade
    Toyota S12.8 Brake Caliper upgrade
    Triple Weber DCOE 42's
    Mcburnie GTO
    Body Kit

  2. #2
    Known Zitus carrier! hls30.com's Avatar
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    Hey Blox,
    with the engine running, leaking fuel draining between the radiator and the ac compressor will be dumped right into your cooling fan, slapping it into a very fine mist and blowing it all over your dizzy and exhaust manifold!
    Put a lip on the end and a nipple for a hose and route the drainage under the car out of any ambient airstreams...
    Will
    Last edited by hls30.com; 05-25-2007 at 07:17 PM.
    A Z is beautiful from any angle, I just happen to prefer to view from the drivers' seat!

  3. #3
    Registered User Curtis240Z's Avatar
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    Don't forget the insulators between carbs and manifold. They are for heat and vibration dampening. As for tuning a wideband O2 gauge and sensor like an AEM UEGO Gauge http://store.summitracing.com/partde...5&autoview=sku works wonders to pinpointing your tuning needs.

  4. #4
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    Default

    Quote Originally Posted by bloxman View Post
    Everything I have read says the DCOE's don't like heat.
    If underhood heat is a problem for the carb.'s - - I would not have used a distribution block - that routes fuel to the individual carb.'s with no return. The fuel in the lines from the distrubution block, as well as the fuel in the floats has a good chance of picking up a lot of heat.

    I would have used a fuel pressure regulator - then pumped fuel to the rear carb and on through it - to the center and on through it, then to to front carb and through it to a return line. This effectively keeps the fuel in the lines and going to the carb.'s cooler.

    FWIW,
    Carl B.

  5. #5
    240Z Elec. Upgrade guy Zs-ondabrain's Avatar
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    I'm happier than a fat kid in a candy shop!!! I just picked up a triple set of 40 DCOE Webers on a Cannon Manifold With Linkage for only $500!!!

    And while I'm getting ready for delivery, I found this for any and all who are interested.

    http://www.racetep.com/webtechpage.html

    All of Webers technical info is all this page. A MUST READ for all triple newbies.

    Dave.
    Rate my Z at Car Domain.com
    My 70' 240Z, Daily Driver

    My Parking Light and Headlight Upgrade Harness's at MotorSport Auto
    HLH - PLH - SCP - ZXP's at MSA *They accept PayPal!!*
    Headlight Upgrade Harness info here at ClassicZCar Club
    HLH info at CZCC Do a search for info on the other upgrades I offer.

  6. #6
    Registered User tanny's Avatar
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    I hooked my triple webers directly from the mechanical fuel pump(which is supplied by the original electric pump on my 73). Originally I installed the pressure regulator between the mechanical pump and the carbs, but then I tried eliminating the regulator and hooked into the original fuel return line, and didn't have any problems supplying enough fuel to the carbs(although I don't have a cam, so possibly if I had a high performance cam I might have needed more pressure than the gas return line alone would allow). I also insulated all the fuel lines around the engine compartment and fabricated a large heat shield. Definitely no vaporization problems. Victor.

    ps I was able to jet the webers enough to make them serviceable, but never could get them to run lean enough. Just too much carb for my un-modified low performance engine. Switched back to stock(actually roundtops) carbs with no performance loss.
    Last edited by tanny; 06-21-2007 at 07:03 AM.
    73 Z, 06 Honda civic

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