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need some help

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  • need some help

    I bought a 63 Avanti that didnt run. Changed the auto to manual, Replaced the distributor with an electronic uint by Dave Thiebuild along with the carb. Replaced many other parts as well. I am having a problem tuning the car. Starts well, idles good, but seems like its getting too much fuel. I have made sure the needle is not blocked, but dont really know what else the problem could be. When I exchanged the carb, Dave said the carb I had wasn't for an Avanti. This is my first Studebaker so I dont have any info about the engine codes. Could an Avanti carb on a non avanti 289 be this much of a problem? The # stamped on the block is PH329.

  • #2
    The whole ENGINE is non-Avanti, so IF it is actually Std. 289 inside, it should not matter! The block at least, is a 1964 Standard 289 from a Lark or Hawk. You may have a fuel pump problem, a wrong fuel pump or bubble in the diaphram can actually cause too much pressure.

    StudeRich
    Studebakers Northwest
    Ferndale, WA
    StudeRich
    Second Generation Stude Driver,
    Proud '54 Starliner Owner

    Comment


    • #3
      quote:Originally posted by fe427avanti
      but seems like its getting too much fuel.
      What are the symptoms?

      Dick Steinkamp
      Bellingham, WA

      Comment


      • #4
        quote:Originally posted by Dick Steinkamp

        quote:Originally posted by fe427avanti
        but seems like its getting too much fuel.
        What are the symptoms?

        has a hard time on acceleration. most of the time, seems to flood out.
        possible back fire but sounds more like raw fuel igniting in the exhaust. leaks fuel from exhaust.

        Comment


        • #5
          quote:Originally posted by fe427avanti

          has a hard time on acceleration. most of the time, seems to flood out.
          possible back fire but sounds more like raw fuel igniting in the exhaust. leaks fuel from exhaust.

          Fuel really can't "leak from the exhaust". My guess is that what you are seeing here is condensation (water). All cars do this to some extent on start up. It's normal. If it was fuel, your car would be on fire [:0].

          Poping either back through the carb (can you see flames coming out of the carb with the air cleaner off?) or through the exhaust, can be caused by wrong ignition timing (usual cause), but also by cam timing off, or stuck valves. Also by fouled plugs, loose wire in the ignition circuit (primary or secondary), or by a too rich or too lean mixture.

          What do you mean by "hard time on acceleration"? Does it stumble when you press the accelerator? Only when it's cold? If so, it could be the choke isn't working properly. If when hot it could be that the carb accelerator pump isn't working properly or the timing is off. Or do you mean it doesn't have much power when accelerating but it doesn't stumble? If so, it could be the carb needs reabuilding or adjustment, timing off, distributor advance not working, valves adjusted wrong, and probably many other possibilities.

          Again, what do you mean by "seems to flood out"? This is a diagnosis, not a symptom. Does the engine "die" when you open the throttle? With the engine not running can you look down the throat of the carb and see gas squirting when you work the accelerator? Do you get black smoke out of the exhaust at any time? Under what conditions? Have you adjusted the timing, dwell, and valves per the shop manual? Have you tested the mechanical and vacuum advance mechanisms in the distributor to see if they are working?

          Stick with it, you'll woop it

          Dick Steinkamp
          Bellingham, WA

          Comment


          • #6
            Often times a too rich mixture runs better when the engine is cold than after it warms up and too lean runs better after it's warmed than when it's cold.

            Lean mixtures tend to backfire through the exhaust on decceleration.

            A too rich mixture tends to run better the faster the engine runs or under a heavy load. A too lean mixture runs better on a light load.

            A too rich mixture tends to make the engine lope or have a "soft" quality to the misfires. A too lean mixture makes an engine buck and the misfires are sharp or abrupt.

            Help any?

            Comment


            • #7
              IF.... your diagnosis in correct (getting TOO MUCH fuel) then Stude Rich's idea of too much pressure could be at fault. Is this car using the factory (mechanical) fuel pump or an electric? Electrics have a tendancy to put out more pressure than the carb can handle. This might dictate a pressure regulator to stop the fuel pump from overpowering the float needle.
              Of course, a carb improperly jetted would cause richness as well, but if I read right, you have a carb from Dave as well? I doubt Dave would get it wrong - the jetting, that is.[:I]

              Miscreant adrift in
              the BerStuda Triangle!!

              1957 Transtar 1/2ton
              1960 Larkvertible V8
              1958 Provincial wagon
              1953 Commander coupe

              No deceptive flags to prove I'm patriotic - no biblical BS to impress - just ME and Studebakers - as it should be.

              Comment


              • #8
                My idea could be at fault?[:0] I think you do mean the excess fuel pressure could be at fault, [}]Right? LOL

                quote:Originally posted by Mr.Biggs

                IF.... your diagnosis in correct (getting TOO MUCH fuel) then Stude Rich's idea of too much pressure could be at fault.
                StudeRich
                Studebakers Northwest
                Ferndale, WA
                StudeRich
                Second Generation Stude Driver,
                Proud '54 Starliner Owner

                Comment


                • #9
                  Insert "THE" for "at", Rich.[:I] Really - I wasn't trying to blame YOU.[B)]

                  Miscreant adrift in
                  the BerStuda Triangle!!

                  1957 Transtar 1/2ton
                  1960 Larkvertible V8
                  1958 Provincial wagon
                  1953 Commander coupe

                  No deceptive flags to prove I'm patriotic - no biblical BS to impress - just ME and Studebakers - as it should be.

                  Comment


                  • #10
                    You can get an adjustible fuel pressure regulator from any auto parts
                    house and add it between the fuel pump and carb. Set it to 3 psi and
                    see if the problem goes away. There isnt much different between an
                    Avanti carb and a non-Avanti Carb. Just jetting, and its not a big
                    enough difference to cause a serious problem.

                    Tom

                    '63 Avanti, zinc plated drilled & slotted 03 Mustang Cobra 13" front disc/98 GT rear brakes, 03 Cobra 17" wheels, GM alt, 97 Z28 leather seats, soon: 97 Z28 T-56 6-spd, Ported heads w/SST full flow valves, 'R3' 276 cam, Edelbrock AFB Carb, GM HEI distributor, 8.8mm plug wires
                    '63 Avanti R1, '03 Mustang Cobra 13" front disc/98 GT rear brakes, 03 Cobra 17" wheels, GM alt, 97 Z28 leather seats, TKO 5-spd, Ported heads w/SST full flow valves.
                    Check out my disc brake adapters to install 1994-2004 Mustang disc brakes on your Studebaker!!
                    http://forum.studebakerdriversclub.c...bracket-update
                    I have also written many TECH how to articles, do a search for my Forum name to find them

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