Vaccum advance/Lucas Dizzy

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  • NC Rover
    2nd Gear
    • Dec 2007
    • 288

    Vaccum advance/Lucas Dizzy

    Before I start my search for a new replacement distributer, how do you know if the vaccum advance is working properly? I've tried blowing air through the line to the distributer. Even if you suck the air through the line, no movement of air either way. (**Note: Vehicle in reference has 2.5L engine w/ 2-barral Weber carb.)

    1.) If the vaccum advance is shot, is it something that can be replaced without replacing the entire distributer?

    2.) I have a Jacobs Ignition / Petronix Igniter - obviously there are no more points in the dizzy, so with that said...does the vaccum advance even come into play if I currently have the petronix setup?

    3.) Should I need to get a new distributer, is it possible to still find a new Lucas distributer (part# 42618B 45D4)? Wasn't even sure if they still made them.

    thanks!
    Nick
    1971 Series IIa Hybrid: 2.5L MILSPEC 5-Main Bearing Engine|Turner Engineering Performance Head w/ oversized hardened steel valves & phase shift/increased lift cam|LT77 Tranny/LT230 Transfer Case|11mm Ignition Wires/Super Coil|Jacobs Ignition/Petronix Ignitor|D90 Axles|Galvy Frame|Old Man Emu Coils|Cust Rear/Side Fuel Tanks|Cust Drive Shafts|
  • Jim-ME
    Overdrive
    • Oct 2006
    • 1379

    #2
    If our hosts don't have complete dizzys RDS has genuine Lucas ones. Scott beat me to the vacum advance.
    Jim

    Comment

    • scott
      Overdrive
      • Oct 2006
      • 1226

      #3
      if sucking dosen't cause the dizzy deck to move then your vaccum adv ain't work'n. it's a pretty simple set up. intake causes a vaccum. this vaccum pulls a diaphram that's attached to a mechanism the rotates the deck that our points and conensor are mounted to. if the axis and mechanism attached to the dizzy deck are lubed and they don't move when you suck on the tube the the diaphram has got to be bad.

      rn has a vac adv unit http://www.roversnorth.com/store/p-2...-cylinder.aspx
      '64 Series IIA 88 Canvas Tilt
      '68 Series IIA RHD Ambulance
      '76 Spitfire 1500
      '07 LR3 (Series Recovery Vehicle)

      Comment

      • NC Rover
        2nd Gear
        • Dec 2007
        • 288

        #4
        Originally posted by scott
        if sucking dosen't cause the dizzy deck to move then your vaccum adv ain't work'n. it's a pretty simple set up. intake causes a vaccum. this vaccum pulls a diaphram that's attached to a mechanism the rotates the deck that our points and conensor are mounted to. if the axis and mechanism attached to the dizzy deck are lubed and they don't move when you suck on the tube the the diaphram has got to be bad.

        rn has a vac adv unit http://www.roversnorth.com/store/p-2...-cylinder.aspx
        So I guess my question now is, does the vaccum advance apply even though I have no points and have the petronix igniter / jacobs coil setup?
        1971 Series IIa Hybrid: 2.5L MILSPEC 5-Main Bearing Engine|Turner Engineering Performance Head w/ oversized hardened steel valves & phase shift/increased lift cam|LT77 Tranny/LT230 Transfer Case|11mm Ignition Wires/Super Coil|Jacobs Ignition/Petronix Ignitor|D90 Axles|Galvy Frame|Old Man Emu Coils|Cust Rear/Side Fuel Tanks|Cust Drive Shafts|

        Comment

        • scott
          Overdrive
          • Oct 2006
          • 1226

          #5
          Originally posted by NC Rover
          So I guess my question now is, does the vaccum advance apply even though I have no points and have the petronix igniter / jacobs coil setup?
          i don't know. good question. i've a petronix but haven't had a chance to use it as my motor's still on a stand.
          '64 Series IIA 88 Canvas Tilt
          '68 Series IIA RHD Ambulance
          '76 Spitfire 1500
          '07 LR3 (Series Recovery Vehicle)

          Comment

          • xsbowes
            2nd Gear
            • Dec 2006
            • 258

            #6
            Yes vacuum advance still comes into play with the pertronix igniter. In fact they sell a dizzy to replace the 45d that has vacuum advance and the igniter.

            here's the link

            The experts at PerTronix are ready to help you choose the perfect high performance ignition and exhaust products. We're enthusiasts too!


            Runs about $165
            Stacy
            Motta S.A. Italy

            Comment

            • Oscar
              Low Range
              • Dec 2008
              • 51

              #7
              I'm sorry if I'm stating the obvious, but: Are we to assume that you are creating a vacuum when sucking on the hose? As in you are not getting any airflow? If you are there's a leak in the hose....
              Hannibal...... 1964 SIIA 88" NAS.....

              Comment

              • scott
                Overdrive
                • Oct 2006
                • 1226

                #8
                Originally posted by Oscar
                I'm sorry if I'm stating the obvious, but: Are we to assume that you are creating a vacuum when sucking on the hose? As in you are not getting any airflow? If you are there's a leak in the hose....
                yes if you suck on the vacuum hose going to the dizzy and the dizzy deck does not shift then the hose or the diaphram leaks or there's something in the deck shifting mechanism that ain't giving under the force of the vacuum you've created. if a new hose doesn't help then remove the dizzy deck and vacuum thing. you should see a small rod (hook) that comes out of the vacuum thing. pull on the deck shift mechanism the way the hook would. it will be very easy (little force) to get the deck shift mechanism to move. if the deck mechanism doesn't move under the lightest of pull, look for what it's hanging up on.
                '64 Series IIA 88 Canvas Tilt
                '68 Series IIA RHD Ambulance
                '76 Spitfire 1500
                '07 LR3 (Series Recovery Vehicle)

                Comment

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