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-   -   Cautionary against resistor sparkplug usage w/ CDI (http://forums.pelicanparts.com/porsche-911-technical-forum/294069-cautionary-against-resistor-sparkplug-usage-w-cdi.html)

Early_S_Man 07-18-2006 11:48 AM

Cautionary against resistor sparkplug usage w/ CDI
 
Just ran across this at Federal-Mogul Champion website:

http://www.sparkplugs.com/glossary.asp?kw=CDI&manID=undefined
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Quote:

CDI

CDI (Capacitive Discharge Ignition) for outboard marine motors is basically a refined version of the old magneto ignition system, except the points have been replaced with electronic circuitry. CDI is used on some (not all) late model marine engines such as Johnson and Evinrude, and some late model motorcycle engines. Do not use a "regular" resistor type plug on a motor with this type of Capacitive Discharge Ignition as this will cause misfire and poor performance. Rather, make sure to use a plug with an inductive type resistor (such as a Champion Q-type or NGK Z-type). Use of non-inductive resistor type plugs on these motors can create an open circuit within the spark plug (it will become a dead plug). Modified automotive racing motors also have a form of CDI, (such as Mallory, MSD, Crane and Accel), these should not be confused with the marine or powersports systems, please refer to High output ignition systems for more information.

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Any experiences to confirm problems???

Rather curious, since resistor-type RN7YC is recommended for 911SC engines!

ps,

Champion also recommends anti-sieze compound:
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Quote:

Special Tip: Anti-seize compound is useful when replacing spark plugs in aluminum cylinder heads.
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