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Avanti R2 manifold

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  • Engine: Avanti R2 manifold

    Would like some information on the Avanti R2 intake manifold Is there any difference on a standard or a R1 intake manifold And would there be any problem using a non stock R2 manifold

  • #2
    According to the Avanti Parts Manual the manifolds for R-1 and R-2 engines have different part numbers.

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    • #3
      The difference is slight, but Studebaker wouldn't have gone to the trouble of two different part numbers unless they thought it necessary. It comes down to one slot between the two sides.

      jack vines
      PackardV8

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      • #4
        The R1 is the oddball. As Jack said, it doesn't have transfer slots. FWIW, the R2 is the same as a 'regular' V8 AFB manifold.
        78 Avanti RQB 2792
        64 Avanti R1 R5408
        63 Avanti R1 R4551
        63 Avanti R1 R2281
        62 GT Hawk V15949
        56 GH 6032504
        56 GH 6032588
        55 Speedster 7160047
        55 Speedster 7165279

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        • #5
          R2 intake manifold

          Originally posted by 64studeavanti View Post
          The R1 is the oddball. As Jack said, it doesn't have transfer slots. FWIW, the R2 is the same as a 'regular' V8 AFB manifold.
          Thanks for info. My Avanti has the regular manifold without the fitting for vacuum Should I be taking the distributor vacuum from manifold or from the base of carburetor I also understand that the R2 takes a different intake gasket Why??

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          • #6
            The Avanti gaskets have one side of the heat transfer blocked off, and one side has a small 1/2" opening. This is to cut down the heat soak of the carburetor. The nature of Avantis was high speed, and higher RPMs than non R series engines. Thus more heat generated.
            Bez Auto Alchemy
            573-318-8948
            http://bezautoalchemy.com


            "Don't believe every internet quote" Abe Lincoln

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            • #7
              Originally posted by bezhawk View Post
              The Avanti gaskets have one side of the heat transfer blocked off, and one side has a small 1/2" opening. This is to cut down the heat soak of the carburetor. The nature of Avantis was high speed, and higher RPMs than non R series engines. Thus more heat generated.
              There's a lot of misunderstanding about "R" series intake gaskets. R-1's used the same gaskets as other V8's, with wide open heat riser passages. R-2's used a standard gasket on the right, passenger side, and a restricted gasket on the left. It had a small round hole. The SAE paper specifies stainless steel. The misunderstanding results partly because the small hole looks like it's made to accommodate the choke stove on the right. I don't know if it actually would or not. The SAE paper is very clear, with a picture. The restricted gasket goes on the left. The reasoning was that the supercharger added enough heat that less was needed from the heat riser passages.
              Mike M.

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              • #8
                I have read that its better to take vacuum from the manifold than from base of carburetor The R2 manifold has a port for the purpose of vacuum line fitting

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                • #9
                  Yes, that is why it comes from the intake Runner on the Left rear of the Manifold.
                  StudeRich
                  Second Generation Stude Driver,
                  Proud '54 Starliner Owner

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                  • #10
                    Originally posted by orecrush View Post
                    I have read that its better to take vacuum from the manifold than from base of carburetor The R2 manifold has a port for the purpose of vacuum line fitting
                    The port on the intake fitting is for the vacuum dash pot that raised the idle on AC cars.

                    The vacuum for the distributor on Studebaker is "timed," and kicks in after a certain throttle plate angle.

                    Hooking it directly to the intake will give you around 9deg of advance after it starts up (vacuum on that port will be 17" if all is set right), if you have the true Avanti distributor.

                    The Vacuum from the front of the carburetor will start from 0" at idle and progress after opening the throttle and engine is not in acceleration.

                    For the cross-over..

                    If possible, block off the cross-over.

                    http://www.ebay.com/itm/162637016805

                    This will keep the exhaust gas out of the intake.

                    Eliminate the 1/8 tube for the automatic choke and switch to electric choke.

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