CA77 Points cam lobe question-SOLVED

[onchiman]

Just for clarity on my part:
On a 1963 CA77 Dream, there is only one set of points. The points cam however has two lobes which are opposite each other. With this model engine, if we are to look at one 360 degree rotation of the POINTS cam, (forget the crankshaft) the points will have opened and closed twice, exactly 180 degrees apart.

Now, I'm building an electronic ignition for my 1963 CA77. I'm using one ignition module from a Dyna-S mounted on the points plate which replaces the points entirely. This ignition module is basically a switch which is triggered by a magnet that's attached to a rotor affixed to the points cam.

I'm at the stage of building a rotor that will attach to the points cam. So here's my question, will I need two magnets on the rotor 180 degrees apart (opposite one another)? I just want to be sure I'm thinking this through clearly.

Edit: Indeed I do need two magnets 180 degrees apart on the rotor. And the polarity must be oriented the same for each.

Thank you for your indulgence.

[e3steve]

Yes, yes and I agree. The device you're fabricating is a Hall-effect trigger; the polarity of the magnets shouldn't matter but, for accuracy, keep it the same.

http://en.wikipedia.org/wiki/Hall_effect