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Originally Posted by Tom Kirkham
Proper distributer phasing is when the coil is firing when the rotor is lined up with the terminal on the cap. If the box is out of phase the coil will fire between the terminals. This will play havoc with the cap and rotor... On cars that have been phased properly I have not seen a problem. On cars that are phased backwards less than 1,000 miles for a new cap and rotor is not uncommon.
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I guess to check this you need a clear distributor cap and a timing light?
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Originally Posted by priobe
I am still confused about the phasing of the dist. cap. If you move the cap to try to align the rotor to the cap wouldn't that change the timing?
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With the MSD distrib, it has a magnet, a ? rotor vane ( 8 vanes), and an induction coil. As the rotor vane moves past the induction coil it induces a current that the spark control box senses, and subsequently charges the coil for the spark release. To adjust the phasing, I'd guess you'd have to change the orientation of the rotor vanes with respect to the rotor.