crank trigger

Discussion in 'PSI Superchargers Tech Questions' started by Policy Peddler, Apr 12, 2013.

  1. Policy Peddler

    Policy Peddler Member

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    tried to hook up a crank trigger. the wires were 2 inches short. I put in a msd jumper wire, 6ft, made the mistake of it being coiled. when i got to 5000 rpm it was fine, as it went up, the motor started to break up and loose horsepower. I then plugged into the mag trigger with the jumper wire. the motor ran fine. Which I would think eliminated the coiled jumper wire.
    I then tried 2 other crank triggers, 3 total, they all broke up above 5300 rpm's
    Has any one got any ideas?
     
    #1
    Policy Peddler, Apr 12, 2013
  2. jay70cuda

    jay70cuda Well-Known Member

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    How close is the wheel to the magnet. It should be really tight gap. Also take a screw drier and check all your magnets on the wheel to be sure the magnets are still strong. Also can you move the pickup mount 90 degrees to remount so you can get rid of that wire .
     
    #2
    jay70cuda, Apr 12, 2013
  3. Policy Peddler

    Policy Peddler Member

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    magnets and pickup location.

    I tried it from .030 to .070, never checked the magnets.
    what i did have after i got through making shims, the wheel is .375 wide. The pickup is off center toward the front. I would say the entire pickup is over the wheel, but not centered. After thought, the magnet does not go all the way to the front of the wheel. so part of it could be over the aluminum in the wheel.
     
    #3
    Policy Peddler, Apr 12, 2013
  4. NITROBANDIT1

    NITROBANDIT1 LOST IN SPACE

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    impolarization

    be aware the crank trigger does have a positive and negative wire. if they are backwards, all kinds of weird stuff happens. I would hook up a labscope and check the patterns out. might be something entirely unrelated. msd has good wiring diagrams on their website. make sure its centered first on the magnets. does it miss just on the distributor alone? dan
     
    #4
    NITROBANDIT1, Apr 12, 2013
  5. Blown5402

    Blown5402 Member

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    Ignition Type

    What ignition are you running? THANKS! Jim
     
    #5
    Blown5402, Apr 12, 2013
  6. Policy Peddler

    Policy Peddler Member

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    44 pro mag
     
    #6
    Policy Peddler, Apr 14, 2013
  7. Blown5402

    Blown5402 Member

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    8973 or Powergrid or MSD Digital 7

    What controller are you using for timing on the 44? THANKS! Jim
     
    #7
    Blown5402, Apr 14, 2013
  8. Policy Peddler

    Policy Peddler Member

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    control

    44 points box with rev limiter - chip 8,000
     
    #8
    Policy Peddler, Apr 14, 2013
  9. Critical Mass

    Critical Mass Member

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    It sounds like your crank trigger is not grounded. You need good RF shielded wires when you run a 44 mag. Leahy can fix you up with any length wire harness you need.
    Good luck, Joe
     
    #9
    Critical Mass, Apr 14, 2013
  10. Policy Peddler

    Policy Peddler Member

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    jumper wire & interference

    i do not understand why it had issues with the crank trigger and not with the trigger in the mag with the 6 jumper wire in it.
     
    #10
    Policy Peddler, Apr 14, 2013
  11. Mike Canter

    Mike Canter Top Dragster
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    As previously said you need to check that the violet wire from the trigger goes through the extension to the points box violet wire and nobody accidently switched. Secondly you need to be using a shielded extension wire that has a ground wire from the shield to chassis ground and that the shield from the trigger cable is also grounded. Not using grounded shielded cables will cause a false trigger to be picked up by the points box from the high voltage spark. The is a very common problem and can destroy a motor. Also route that crank trigger cable away from any other cables.

    My recommendation is to sell that trigger you have now and buy one from Dave Leahy with a custom length cable that eliminates that extension
     
    #11
    Last edited: Apr 14, 2013
    Mike Canter, Apr 14, 2013

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