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

 
The AirCraft Rotary Engine NewsLetter.  Powered by Linux.
ACRE NL web site. http://home.earthlink.net/~rotaryeng/            
Copyright 1998-2002 All world wide rights reserved.