A bad heat range spark plug can ruin your whole day and
       lead to loss of power and a broken apex seal. I have formated
       the thread on on this subject and uploaded it to the web site.
       Please read:http://www.rotaryeng.net/ignition.html

       "All about spark plugs for rotary engines."

       Thanks to Joe Hull for discovering this.

       If anybody has anything else to add please upload your
       thoughts.
       --
       Paul Lamar ...No rotor no motor.


   Ok,
   I've got a '93 13BREW, normally aspirated, with the original rotors-9/1
   compression. The spark plugs I have in it are NGKs  the leading splugs
   are BUR7EQ(Leading), and BUR9EQ(Trailing). They are brand new, and I
   think they are what are recommended as stock in the auto application.
   Should I go to BUR9EQ leading and BUR11EQ Trailing?

   Anyone?

   Thanks

   Brian Trubee

   I would use them while you are running the engine on the ground.
   When you get ready to fly install the colder plugs.
   http://www.rotaryeng.net/Spark-plugs/plugcolorchart2.html

   Paul Lamar ...No rotor no motor.

Why do you need them colder with a low compression ?

Roderick Scotto

Did NGK say that? I suspect you have it backwards.

"Higher Compression Ratios/Forced Induction will elevate spark
plug tip and in-cylinder temperatures"

Paul Lamar ...No rotor no motor.

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