bouncy timing mark... - NCRS Discussion Boards

bouncy timing mark...

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  • Stuart F.
    Expired
    • August 31, 1996
    • 4676

    #16
    Re: bouncy timing mark...

    Kevin;

    I'm 73 years old and at times thought I'd seen it all until a new wrinkle shows up. I have a numbers correct AFB carb for my 63 that I bought from a fellow NCRS friend, and I've been playing with it for over a year now trying to sort out a lean surge condition. Each time I tear it down I find something else that could be the cause. I got to the point that I got the surge out and then I had a hard hot start problem with it. Fortunately, I have a later replacement model that works super well and I have to have it on most of the time just to enjoy my car on cruise nights.

    When I first got my car back out of storage in 1976, I found the mechanical advance springs were weak and the weights rusty and gummed up. The engine would not idle down and was erratic, but would go like a banshi under WOT. I fixed the distributor and then tackled the original carb. The base gasket in the rebuild kit was incorrect and I had a vacuum leak. The engine ran badly as before with the ignition condition. I looked at the gasket, the manifold and the carb base and all looked ok, but a change to a new gasket was necessary to solve the problem. To this day I don't know why.

    Stu Fox

    Comment

    • Kevin N.
      Expired
      • September 30, 2002
      • 88

      #17
      Re: bouncy timing mark...

      stu...i will show him this story immediately. at first chance i will suggest getting new weights, springs and a new carb base gasket. very small price to pay for parts to see if this will solve it. he did say he was picking up a kit with the different springs and weights to replace the old ones. i'll keep my fingers crossed...

      Comment

      • John H.
        Beyond Control Poster
        • November 30, 1997
        • 16513

        #18
        Re: bouncy timing mark...

        Originally posted by Kevin Nelson (38775)
        stu...i will show him this story immediately. at first chance i will suggest getting new weights, springs and a new carb base gasket. very small price to pay for parts to see if this will solve it. he did say he was picking up a kit with the different springs and weights to replace the old ones. i'll keep my fingers crossed...
        Kevin -

        Don't use the new "kit" weights - they're not hardened, and aren't contoured correctly - they're junk. Clean up the old ones and either use a dial-back timing light to map the existing advance curve or have it set up properly on a distributor machine. The "kits" are useless except they provide a few more springs to use while mapping/setting up the curve.

        Comment

        • Gerard F.
          Extremely Frequent Poster
          • June 30, 2004
          • 3803

          #19
          Re: bouncy timing mark...

          Agree with John. If you can find a distributor machine, it would be worth it to check the distributor out. From your description of the problem, it seems to me like an end play in the distributor shaft problem or a distributor shaft bearing problem. Just guessing.
          Jerry Fuccillo
          1967 327/300 Convertible since 1968

          Comment

          • Clem Z.
            Expired
            • December 31, 2005
            • 9427

            #20
            Re: bouncy timing mark...

            `sounds like "spark scatter" caused by the oil pump. make sure the dist gear or the cam gear is not worn. also check the the oil pump drive shaft.

            Comment

            • Duke W.
              Beyond Control Poster
              • December 31, 1992
              • 15633

              #21
              Re: bouncy timing mark...

              Kevin, I assume you have seen the following presentation. If not both you and your buddy should get familiar with it.



              Duke

              Comment

              • Edward B.
                Very Frequent User
                • December 31, 1987
                • 537

                #22
                Re: bouncy timing mark...

                Originally posted by Clem Zahrobsky (45134)
                `sounds like "spark scatter" caused by the oil pump. make sure the dist gear or the cam gear is not worn. also check the the oil pump drive shaft.
                Does your friend have, or can he borrow, another distributor so as to isolate the location of the problem?

                Comment

                • Michael A.
                  Expired
                  • April 11, 2010
                  • 14

                  #23
                  Re: bouncy timing mark...

                  Hi Duke - great presentation although quite detailed for those of us who are not aerospace or automotive engineers What I did get out of it was how critical the vacuum advance is to the proper running of my L36 and how important driving style is to performance. A quick point of clarification, does the B28 have the best vacuum advance characteristics for my '66 L36?

                  Thanks

                  Michael

                  Comment

                  • John H.
                    Beyond Control Poster
                    • November 30, 1997
                    • 16513

                    #24
                    Re: bouncy timing mark...

                    Originally posted by Michael Aniballi (51648)
                    Hi Duke - great presentation although quite detailed for those of us who are not aerospace or automotive engineers What I did get out of it was how critical the vacuum advance is to the proper running of my L36 and how important driving style is to performance. A quick point of clarification, does the B28 have the best vacuum advance characteristics for my '66 L36?

                    Thanks

                    Michael
                    Michael -

                    Duke hasn't posted for a long time. The B20 or B26 (same specs for both) are a better match for your L36 than the B28, which is for solid-lifter engines with very low idle manifold vacuum.

                    Comment

                    • Michael A.
                      Expired
                      • April 11, 2010
                      • 14

                      #25
                      Re: bouncy timing mark...

                      Hey John - a big thank you for chiming in....my new can is getting installed today and I will keep you posted on performance....much appreciated.

                      Michael

                      Comment

                      • Michael A.
                        Expired
                        • April 11, 2010
                        • 14

                        #26
                        Re: bouncy timing mark...

                        Hey John - we removed a B1 vacuum advance and installed the B26 can today and the car runs perfect, no bounce no hesitation, great low end and high end....best $7.95 I ever spent....thanks again...now if only the rain would stop....enjoy the long weekend....

                        Michael

                        Comment

                        • John H.
                          Beyond Control Poster
                          • November 30, 1997
                          • 16513

                          #27
                          Re: bouncy timing mark...

                          Originally posted by Michael Aniballi (51648)
                          Hey John - we removed a B1 vacuum advance and installed the B26 can today and the car runs perfect, no bounce no hesitation, great low end and high end....best $7.95 I ever spent....thanks again...now if only the rain would stop....enjoy the long weekend....

                          Michael
                          Michael -

                          Glad you got it squared away - go ahead and drive it - it won't melt!

                          Comment

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