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Bucking on Coast Down ?

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  • Bucking on Coast Down ?

    When I let off of the gas on my 3-spd/OD '50 Starlight it does not coast down smoothly. It bucks. If I tickle the gas it gets better but it is still there. Someone suggested that I replace the carbs primary jets (2ea 1bbl Hollys on my Cathcart 185). I went a bit larger, no change. Any help on this would be appreciated.

    Harv [8D]

    StudeBakerHarv
    StudeBakerHarv
    * 1950 Champion Starlight Coupe (Cathcart Stg 4 Engine)
    * 1971 Avanti II (RQB-1659).

  • #2
    You might want to check that the idle speed is not to high. You also might want to call Bill Cathcart and see what jets he reccomends. I would also check the float levels.

    GARY H 2DR.SEDAN 48 STUDEBAKER CHAMPION NORTHEAST MD.

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    • #3
      Have the very same problem with mine, but it is much better now. My solution was the rear motor mount (Rubber)attached to the engine bell housing and the drive shaft mounts on either side of the drive shaft center bearing. Still have a trace of the problem.

      Buddy...'54 Champion 2dr
      Warner Robins, GA 31088
      478-953-3077

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      • #4
        A sticky timing advance could also cause this problem. I'd make sure the advance mechanism in the distributor is free and that the timing advacnes and retards with changing rpm. Use a timing light if you've got one, and if it's sticking you'll be able to see it.

        Mike with Speedster

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        • #5
          According to my shop manual you should put a .020 feeler gauge between the distributer and vacuem advance at the base of the dist. before you tighten the clamp.

          GARY H 2DR.SEDAN 48 STUDEBAKER CHAMPION NORTHEAST MD.

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          • #6

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            • #7
              Thanks for the feedback Gents. When I got the engine from Cathcart in '02, the lg Holly 1-bbl carbs had two different size jets in them. One had a #52 & the other a #56. Bill suggested, at that time, to go a bit larger so I put in #58s with no real change noticed. Buddy mentioned that the carb on his std 170 engine has a #94 jet. I ck'd the Holly site about gen'l info on jetting. They give some detail on changing jet size and say that manifold vacuum & spark plug coloring (lean or rich burn) is what to watch for. Also that having to move up or down 8-10 jet sizes may be due to a carb not properly matched for the application. Still considering this issue.

              I will definitely look at trying the great suggestions from you all and especially 1949commander's detailed help points.

              Thanks again and Happy Holidays to you all, Harv [8D]



              StudeBakerHarv
              StudeBakerHarv
              * 1950 Champion Starlight Coupe (Cathcart Stg 4 Engine)
              * 1971 Avanti II (RQB-1659).

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