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Pulse signals and location

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  • Pulse signals and location

    On the topic of the pulse signal going to the carb 2 questions.

    Is a pulse signal directly off the case to the carb stronger than the normal pulse signal that goes through the pulse hole in the intake?

    &

    Would there be any benefit to sending 2 pulse signals to the carb? One from the case via a barbed fitting and the other through the normal intake pulss hole.

  • #2
    The pulse signal will be of equal strength for the purpose of moving the carburetors diaphram. Whether plumbed externally via fuel line and barbed fitting (off the case) or internally (pulse hole on intake). Many cylinder reeds required that you tap the case as the pulse hole was filled/eliminated when the reed was installed so case plumbing was required. Tapping the case increases the risk of air leaks so unless necessary stick with the stock setup. 2 pulse signals will provide no benefit unless you maybe wanted to run a vacuum diaphram water pump. Was done back in the day at least a few times.

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    • #3
      What purpose would a water pump serve on a goped?

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      • #4
        Two pulses is not a good idea.

        If your stock pulse works fine, don't mess with it.

        Case pulsing does not increase the chance of leaks at all if you do ot right.

        For reeds, sometimes the pulse can be routed through the reed.

        tl;dr op don't mess with your engine's pulse if its working fine.
        Instagram: @base_cat

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        • #5
          There were some water cooled setups attempted back in the day that required a water pump for the cooling system

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          • #6
            Originally posted by superx1965 View Post
            The pulse signal will be of equal strength for the purpose of moving the carburetors diaphram. Whether plumbed externally via fuel line and barbed fitting (off the case) or internally (pulse hole on intake). Many cylinder reeds required that you tap the case as the pulse hole was filled/eliminated when the reed was installed so case plumbing was required. Tapping the case increases the risk of air leaks so unless necessary stick with the stock setup. 2 pulse signals will provide no benefit unless you maybe wanted to run a vacuum diaphram water pump. Was done back in the day at least a few times.
            Best reply man.

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            • #7
              Originally posted by Basement Cat View Post
              Two pulses is not a good idea.

              If your stock pulse works fine, don't mess with it.

              Case pulsing does not increase the chance of leaks at all if you do ot right.

              For reeds, sometimes the pulse can be routed through the reed.

              tl;dr op don't mess with your engine's pulse if its working fine.
              Says the guy who used to swear by case pulsing

              I was recently messing around with the idea on my cylinder reed 46, ended up keeping the reed pulse. but I also made a big ol’ hole in my piston soo I knew I was getting case vacuum up through my reed. Filled the factory pulse hole Up with JB weld (tryin to compensate for as much vacuum loss as possible since I upped the volume of the case significantly) this thing rips pretty hard.
              *******Pedding since '02********

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              • #8
                Originally posted by dsport View Post

                Says the guy who used to swear by case pulsing

                I was recently messing around with the idea on my cylinder reed 46, ended up keeping the reed pulse. but I also made a big ol’ hole in my piston soo I knew I was getting case vacuum up through my reed. Filled the factory pulse hole Up with JB weld (tryin to compensate for as much vacuum loss as possible since I upped the volume of the case significantly) this thing rips pretty hard.
                hahaha

                I almost always case pulse a reeded engine, and sometimes I'll do it for modded piston ported engines as well. But if it ain't broke don't fix it, so I usually only do it if there is a problem, or if I need it for the porting that I plan to do.
                Instagram: @base_cat

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