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tacho wire

in 2 Stroke Technical Questions 8 years ago

  • Re: tacho wire

    by » 7 years ago

    Would this circuit work for a Bosch Points Ignition system?
      
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  • Re: tacho wire

    by » 7 years ago

    It might be OK as shown.

    For any points type ignition, you might Increase or eliminate the 47K resistor and reduce the second 10K resistor down to 1k or less.

    You really will need an oscilloscope to see what you are getting, otherwise, it is just a trial and error shot in the dark.

    Bill Hertzel
    Rotax 912is
    North Ridgeville, OH, USA
    Clicking the "Thank You" is Always Appreciated by Everyone.

      
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  • Re: tacho wire

    by » 6 years ago

    The MSD 6 series ignition modules have to take a trigger signal in order to output to the ignition coil. So if you are hooking it to a V8 your trigger signal will be 4 pulses per rev of the crank and so will the tach output. The only reason it is even provided is because the MSD modules are a capacitive discharge ignition with multiple discharges. This would be unsuitable for a tach to read directly off of the coil.

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