Ken Welter wrote:

  When you talk about igniters are you talking about the black box on
the side of the distributor or is that a amplifier.
Ken Welter

Yes those are little amplifiers. In the early RX-7s they were mounted on the fender and would crossfire in some cases. Then the design was changed and they were moved to the distributor where they only crossfire at very high RPMs. Actually crossfire is a poor word to describe the situation. Since the distributor is in the system, all that happens is that when the leading fires, there is enough excess energy in the area to trigger the trailing amplifier. So if you put the timing light on the trailing and adjusting it back and forth has no affect on the timing. That is crossfiring. The trailing amplifier is being triggered by the leading coil firing. No big deal unless you want the split timing at high RPMs. When you add an aftermarket ignition system, you don't need the amplifiers, just the pulse from the pickup coils is enough. So if you add just one aftermarket system on the leading side, the added output makes the problem worse. You can put tape on both sides of a piece of
aluminum foil and cover the outsi
de of amplifiers. You can run the wire from the amplifiers to the coils through dash 4 braided hose and ground the braid. This should be done in any case just to keep noise out of the radio. If you run two aftermarket systems and split the timing, both runs from the pickup coils in the distributor should be in dash 4 hose, and run as far apart as possible. I trashed a real nice periphery port engine learning this
information.

Lynn E. Hanover

 
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