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carbed nitrous?

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  • #1

    carbed nitrous?

    what do you all know about carbed nitrous set ups? I am thinking about throwing a shot into my new engine once I am all finished getting it together....I know Holey sells some bolt on aplications, but it doesn't say that it will work on anything....it just says that it will work on the Holley 4bbl whatever carb....but I am not a fan of Holley, and I kinda consider them to be like nike...they are all name and have nothing to back it up. Any ways, any info out there?

    One more thing....
    I have heard that the early 3rd gens have computer controlled carbs (I am not talking about TBI/ crossfire), but is that just an electric choke or is there more to it than that. Will any electric choke carb work?
    82 camaro x2:
    82 z28 w/ 305 (for now) 4 speed saginaw
    82 berrlinetta with 350 .060 over...3 speed auto

    The Z28 is back under the knife, after the transmission, now its the entire engine....will post pics when all finished.
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  • #2
    Bottom line is that it won't matter what carb you use. Nitrous kits made for use with carbs use a spacer plate with injector bars that sit right under the carb. It will be either a spreadbore holley design (quadrajet) or a square bore Holley design depending on which carb you use. Pretty simple, really.

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    • #3
      I was looking at the NOS Sniper kit and it said for Holley/Quadrajet carbs.. are you saying that it doesn't matter what carb I have and that it should still work...? Because I'm not sure what carb I'm gonna be using yet..

      -Dean
      Working on the 80 Camaro Z28 ..
      Now driving a '90 Talon TSi AWD Turbo...

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      • #4
        Here are some facts to consider.

        Carbs come in a few designs, the most popular are the two barrel and the four barrel.

        The two barrel has two throttle blades, side by side.

        The four barrel as 4 throttle blades, arranged in a square pattern.

        There are two versions of a four barrel. One with all four throttle blades the same size called a square bore. The other has two small primary blades for cruising economy and two much larger blades for WOT power. The sape of the base of these two carbs is different. Adapters can be purchased to adapt them to various manifolds, but they are not the hot ticket. The intake manifold and carb pattern should match for best performance.

        Nitrous kits designed for carbs have a spacer plate that will fit Under the carb and contains the injector bars for fuel and nitrous, the fuel and nitrous lines are plummed into the spacer. you must choose the correct spacer, either spread bore or square bore to match the carb that you are using.

        Another variation is to drill and tap the manifold for port injection, but that's much more complicated and expensive.

        There was also a small kit that would install above the carb in the air filter, but I saw nothing but problems with those kits.

        Hope that helps.

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        • #5
          thank you for all of the input, that really helped me out, with the whole spread bore and square bore thing.
          But now that I know the difference, how do I decide weather I want a spread or square? I want to make a lot of power, but gas prices are getting out of hand ($2.19 for regular ). so what does it really boil down to, how much more gas and power is used and made when comparing a spread bore and square bore carb?
          82 camaro x2:
          82 z28 w/ 305 (for now) 4 speed saginaw
          82 berrlinetta with 350 .060 over...3 speed auto

          The Z28 is back under the knife, after the transmission, now its the entire engine....will post pics when all finished.

          Comment

          • #6
            For street driving and fuel economy I would recommend the Edelbrock 600 or 750 CFM performer series carb with electric choke.

            600 CFM for a stock 305, or the 750 for a healthy 350.

            The performer series carbs are square bore. I never had any problem running the square bore carb on a spread bore intake. Get a square bore nitrous plate to match up with the carb.
            Tracy
            2002 C5 M6 Convertible
            1994 Z28 M6 Convertible
            Current Mods:
            SLP Ultra-Z functional ramair, SS Spoiler, STB, SFCs, Headers, Clutch, Bilstein Shocks, and TB Airfoil. 17x9 SS rims with Goodyear tires, 160F T-Stat, MSD Blaster Coil, Taylor wires, Hurst billet shifter, Borla catback with QTP e-cutout, Tuned PCM, 1LE Swaybars, 1LE driveshaft, ES bushings, White gauges, C5 front brakes, !CAGS, Bose/Soundstream audio, CST leather interior, synthetic fluids

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            • #7
              I recommend a spread bore with vacuum secondaries. holley makes a nice 650 spreadbore, the quadrajet is a spreadbore too. These use small primaries for better mileage, and much larger (huge) secondaries for WOT power. you'll get a decent boost in mileage with this setup.

              Edelbrock makes a current copy of the old Carter carbs, they work well too.

              the other thing to consider is the powerband. Usually, spreadbore manifolds are two plane design, favoring low and midrange. Square bore are typically a single plane, higher rpm design. you give up a little low end, but gain some in the upper rpms. I still say for all around steet pleasure, a dual plane ecelbrock performer plus manifold, Holley 650 vacuum secondary spreadbore carb and a matching powershot 150 horse nitrous kit. This seems to be the best blend of low,mid and upper rpm power. It also is one of the most streetable carbs, easily tuned, easy to service and customize.

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