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  • Fuel System: Carburetor size calculation chart

    For you big carburetor guys, or folks looking to buy new and haven't seen the many size calculators on the web, ponder this.
    Yes, it's old. BUT, math is math, and nothing's really changed, nor will it. "Some" newer calculators have another parameter in the mix, "engine efficiency" (in %). Interestingly, if you put in a realistic...efficiency value, the carburetor size normally goes "down" for this list..!

    Also read the info below the chart. It describes to go "up" in size if your cfm number is between a carburetor size that's available vs. one that is not made by anyone.
    E.G. - 485cfm recommended... Buy a 500cfm carburetor.

    https://offenhauser.co/wp-content/up...talog-1987.pdf

    See listed page 13.

    Mike

  • #2
    I think maybe a PDF has to be "Hosted" somewhere to be on the Internet. I might be wrong but, I tried pasting the Link in the Address Window after clicking it didn't work, and neither worked.
    StudeRich
    Second Generation Stude Driver,
    Proud '54 Starliner Owner

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    • #3
      Worked for me, Rich.
      Howard - Los Angeles chapter SDC
      '53 Commander Starliner (Finally running and driving, but still in process)
      '56 Golden Hawk (3 speed/overdrive, Power steering - Running, but not yet driving)
      '62 GT Hawk (4 speed, A/C, Power steering - running and DRIVING!)

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      • #4
        Works fine.
        David L

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        • #5
          Double checked, works for me also.

          try this...
          Go to Offenhauser - https://offenhauser.co/

          Put your cursor on "Products" (do not click) at the top of the page, go down to "catalogue", click on "catalogue", down to page 13.

          Mike

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          • #6
            OK I finally remembered that my Computer and Windows 10, -Firefox do not hit me on the head and remind me that Files like this do not go in an Obvious place like the toolbar or desktop, they go in the "Downloads File".
            I was expecting a HTTPS:// Website, -wrong!

            So I had about 9 Copies there! . . .. ..
            Thanks.
            StudeRich
            Second Generation Stude Driver,
            Proud '54 Starliner Owner

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            • #7
              Mike Van Veghten , thanks! I made it a sticky and changed the title. Good stuff!

              Clark in San Diego | '63 Standard (F2) "Barney" | http://studeblogger.blogspot.com

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              • #8
                Memo to Mark Wheeler, SDC web Master;

                Should probably be part of the Tech Tips page of the SDC web site as well.
                "All attempts to 'rise above the issue' are simply an excuse to avoid it profitably." --Dick Gregory

                Brad Johnson, SDC since 1975, ASC since 1990
                Pine Grove Mills, Pa.
                '33 Rockne 10,
                '51 Commander Starlight,
                '53 Commander Starlight "Désirée",
                '56 Sky Hawk

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                • #9
                  I bought a 56 Commander 259 3sp auto a few months ago. It has an Edelbrock 600cfm. I get 14 - 15 mpg combined. It drives and accelerates fine, but when the secondaries open, I can barely tell any difference. Anyone wanna trade me their 500?

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                  • #10
                    Yes, some good info, and some interesting items. I looked for a date, but couldn't find one. The latest vehicle that I saw listed was a 1981. Wouldn't it be nice if we could still order some of the items?

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                    • #11
                      Originally posted by Rafe Hollister View Post
                      I bought a 56 Commander 259 3sp auto a few months ago. It has an Edelbrock 600cfm. I get 14 - 15 mpg combined. It drives and accelerates fine, but when the secondaries open, I can barely tell any difference. Anyone wanna trade me their 500?
                      The 500 is not the solution to your complaint. The secondaries will open a bit sooner and a bit wider than a 600, but the problem is your 259" just isn't sucking hard enough to need full secondary air flow on either.

                      jack vines

                      PackardV8

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                      • #12
                        Originally posted by tsenecal View Post
                        Yes, some good info, and some interesting items. I looked for a date, but couldn't find one. The latest vehicle that I saw listed was a 1981. Wouldn't it be nice if we could still order some of the items?
                        What items ? You mean from Offenhauser ?
                        You can. Many items are still available. 4 or 5 months back two oddball, angled carburetor spacers for a project. Yep, they had them in stock.

                        Rafe -

                        I mostly agree with Jack. Your engine just doesn't appear to have the "poop" that it should have.
                        Although, because the primary side of the 500 is much smaller than on the 600, the 500's secondaries may actually open a bit more. Though, they will open slowly and not necessarily be "feelable".

                        Mike

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                        • #13
                          The secondaries aren't needed until the engine gets to some higher rpm.
                          Diesel loving, autocrossing, Coupe express loving, Grandpa Architect.

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