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

Stock RX-7 plugs NGK brand (BUR 7EQ lead, BUR 8EQ trail)  has worked

well

for me.  I get around 250 hrs on auto fuel,  100 or less when I burn

100LL

avgas.  Ed can give a better idea on 100% avgas use, I use a combination

of

both but mostly auto fuel.

Tracy Crook
tcrook@rotaryaviation.com
www.rotaryaviation.com

Ooops, typo error, that should have been BUR 9EQ on trailing plugs

Tracy

 
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