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.


I can't find anything colder than the NGK BUR9EQ spark plugs. THese are
meant for the trailing plugs, but I don't see any reason you couldn't
use them in the leading also. NAyone know if there are any colder plugs
than these? I'll look and see if they make these in platinum electrode.

Brian Trubee

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