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Thread: Back to original ignition setup ?

  1. 05-01-2022, 08:48 AM #1
    Xavier PJB
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    Back to original ignition setup ?

    Greetings,

    Hope you are all well. I'd like some advise about the ignition system/chain on my 2.0S 1968 stock engine.
    Current config :
    Original 2/0S distributor with points
    MSD 6AL associated with MSD coil
    Tacho MSD module

    Weber IDS have been fully restored/fuel system has been replaced (tank, pump, filers etc.)

    The problems after driving a while/track day/ :the engine starts to rattle randomly (engine at running temperature) and my taco gets randomly crazy bouncing from 2000 to 7000 rpm while accelerating hard/track day, and bouncing/checking on highways.
    That is very annoying indeed.

    I changed the regulator, checked the wiring for "leaks" or damage etc. found nothing.

    I suspect an issue with the ignition, some mess in the configuration/chain hence I would like to get it back to original config/ignition chain. Meaning distributor / coil / iignition box


    Any help appreciated.
    O-G 26 - Early911S 2407
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  2. 05-01-2022, 01:46 PM #2
    RSTarga
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    Check your points, sounds like they have closed up
    David

    '73 S Targa #0830 2.7 MFI rebuilt to RS specs
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  3. 05-01-2022, 02:09 PM #3
    edmayo
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    and be sure to use the special lube on the breaker point cam.
    Early S Registry member #90
    R Gruppe member #138
    Fort Worth Tx.
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  4. 05-01-2022, 03:23 PM #4
    9er
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    MSD says not to use solid core wires (if that applies?)
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  5. 05-02-2022, 03:25 AM #5
    Xavier PJB
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    Thanks for the tips, will check later today and get back here.
    O-G 26 - Early911S 2407
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  6. 05-02-2022, 08:52 AM #6
    1969911T
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    MSD ( or any CDI system) does not want a distributor rotor with any resistance. The normal Bosch rotor has about 5000 ohms resistance.
    To see if is MSD related, disconnect the MSD from the coil and distributor, get a standard coil, connect 12vdc from the ignition to the positive of the coil, and connect the negative on the coil to the distributor
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  7. 05-04-2022, 05:44 AM #7
    Jerry L
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    One more thing to look at is the MSD Tac adapter, I had one with a MSD 6AL and was never happy with it bouncing around and poor response time sort of like slow motion. was running Bosch Distributor & points. Another thing was MSD said i would not need the big klunky adapter but when Tac did not work they suggested buying one. After a couple months I pulled it out & went with Bob Ashlock's Tac-Adapt. It worked better and is much smaller and easy to hide in the engine compartment.

    Good Luck!
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