*I put a CDI on the leading coil on my RX-7, to test it prior to
possible installation on my Long-EZ. But I was wondering, if the lead
deposit forms on the ceramic insulator and shorts out the plug, I don't
think even CDI will prevent that? Maybe the only thing that can be done
to minimize lead fouling is very aggressive leaning?*
**
*This is from the ngk website. *
**
*Lead Fouling*
Lead fouling usually appears as yellowish brown deposits on the
insulator nose. This can not be detected by a resistance tester at room
temperature. Lead compounds combine at different temperatures. Those
formed at 370-470°C (700-790°F) having the greatest influence on lead
resistance.

CDI system have the ability to fire through the lead for some
strange reason. That is the main rational for using them.
You probably missed reading the updated ACRE web site on
ignition systems. Most of this data is from
Heinz Heisler book Advanced Engine Technology.

http://www.rotaryeng.net/Why-CDI-2.txt
http://www.rotaryeng.net/AVAIL_SECOND_VOLT.GIF
http://www.rotaryeng.net/2ND_VOLT_COMPAR.JPG

Paul Lamar ...No rotor no motor.

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