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Duraspark II ignition
#1
Is anyone using a Duraspark II ignition system with a factory tach? Thanks Chuck
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#2
Duraspark II distributor, MSD 6AL box and a tach adapter.

If you're using the Duraspark ign box, IIRC you can pull the signal for the tach adapter off the (-) side of the coil and it'll work fine.

https://jegs.com/i/MSD/121/8920/10002/-1...iQQAvD_BwE


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#3
I had The Duraspark setup on my 73 Mach I with factory tach. It worked great for years. I recently switched to the MSD 6AL and the tach adapter. Did you have a wiring question?


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#4
Duraspark II, TFI coil, MSD 6A box

73 conv. 460, D0VE large valve heads, Performer RPM manifold, Voodoo 227/233 cam, Holley 950 HP carb, C6 trans, 3.25 trak-loc.
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#5
(07-22-2018, 01:25 PM)stanger73 Wrote: I had The Duraspark setup on my 73 Mach I with factory tach.  It worked great for years.  I recently switched to the MSD 6AL and the tach adapter.  Did you have a wiring question?


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How was the factory tach connected? I'm trying to help a friend come up with a duraspark system that works with the factory tach. The pertronix distributor that is installed won't clear the ram air set up. Thanks, Chuck
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#6
The tach was connected through the factory pink resistor wire. The resistor wire provided the 1.5 ohm resistance that allowed the tach to read correctly.

I still have my wiring diagrams from when I rewired my car with a painless kit about 5 years ago with the Duraspark setup. Unfortunately, I am in Europe right now and won't be back in the states until the 1st of August.


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#7
Factory tach was fed from ignition feed, through tach, through resistor wire and then to the (+) side of the coil. It's a current triggered tach and sensed the cycles of the coil. The tach adapter replicates those pulses for the tach to work properly.


[+] 2 users Like Hemikiller's post
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#8
Many thanks to all who posted. I now know it is workable if he decides to go that route. Chuck
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#9
Did he end up going with the Duraspark setup?


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#10
He hasn't yet decided. I'll update when he does. Chuck
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