Cool Tracy,
If you run a standard Mazda plug the floating secondary coil won't hurt

you. The problem that was

found was that the fine wire electrode would take on a mushroom shape.

It was believed that the

combination of engine heat and electrical load caused it. The center

wire on the platinum plugs is

softer. the Mazda style with the two or four sidewires and standard

center electrode won't give

problems. I don't have extensive dyno rotary experience so I will bow to

those who have used

advanced timing. The exhaust flames when the secondary coils failed on

our RX-3 sedan racer were

spectacular however!  Bill Jepson

Jean Fouche wrote:

What sparkplugs are you guys using for aviation purposes? THe standard spec
Mazda plugs?

Jean Fouche

 
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