Steve,

The concern is appreciated but the dozens upon dozens of EI one side and Mag on the other installations that have flown for thousands of hours without problem should lay your concern to rest.  Whatever the dynamics, they do not seem to cause a problem with shortening mag life.

Chuck Jensen


-----Original Message-----
From: Lancair Mailing List [mailto:lml@lancaironline.net]On Behalf Of
Steve Colwell
Sent: Thursday, January 03, 2008 1:18 PM
To: lml@lancaironline.net
Subject: [LML] One mag, One electronic ignition



I have not done any tests but I believe if One Mag and One Electronic
Ignition is used you are likely to fail the Mag Coil prematurely (that would
reduce the aprox. 400 to 600 hour normal failure of a new Slick to a really
unacceptable life).  Why??  One of the principal advantages of EI is the
variable timing advance that improves power and efficiency.  When the EI
fires a plug before the Mag, the pressure rise from earlier combustion may
prevent the Mag plug from firing.  Maybe (probably?) preventing the Mag plug
from firing at least at higher altitudes where advance is the greatest. I
base my theory on the old Champion Spark Plug Testers that used an air hose
to increase pressure while firing a plug to check its ability to continue to
fire.  What do others say?


Steve Colwell


  >Gary said....
  >On the other question about dual electronic ignitions:
  >I was thinking about building mine with a dual electronic ignition  and
the
  >power source that I finally came up with (before I abandoned  the idea in
  >favor of using one mag)





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