Mailing List flyrotary@lancaironline.net Message #19992
From: Dale Rogers <dale.r@cox.net>
Subject: [FlyRotary] Spark Plug type
Date: Sun, 10 Apr 2005 15:17:39 -0400
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Ed,

  It may be my memory is foggy (from working too many hours in a week) but, IRRC, "reach" refers to the _thread_ length, not the total penetration including the electrode.  It would be good to lay the new plugs along side the standard ones, with a straight edge on the gasket service, and compare them.

Dale R.
COZY MkIV-R13B #1254
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---- Ed Anderson <eanderson@carolina.rr.com> wrote:

I went back and check the e mail and sure enough I misread the type plug as  B9EQV vice B9EGV.  Interesting in I had actually showed the e mail to the auto parts guy with the correct type circled - but verbally spoke the B9EQV, neither one of us caught the "minor" difference - sigh!    Both plugs have the 19mm (3/5") reach - but don't know if the ground electrode is different or not.   The B9EQV looks just like a conventional plug with perhaps a bit finer center electrode and with a ground strap off the side.  Any difference there could have made a difference - assuming the plugs are the problem.

Well, in a few minutes I am off to see what I can find out and to start taken the engine off.



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