Ed Anderson wrote:

 > > hurting power.  I guess the bottom line is will it hurt to fire both
leading and trailing plugs together?  Would there be some benefit, possible
better bsfc?  Could ther be some "free" horsepower here?

MS

Mark,

    While not directly addressing your question,  if you use Tracy Crook's
EFI/Ignition, or his stand-a-lone Ignition, you are firing both plugs at the
same time (within a few microseconds).  Normally there is a 15 degree lag
between the Leading and Trailing plugs firing.  The main reason for firing
them together is should the Leading ignition system fail in a normal 13B
ignition system there is a substantial loss of power (estimates range from
20-40%)while running on the trailing coil only.  By having the trailiing
plug timing identifical to the leading plug there is only a slight reduction
in power should you lose the leading ignition coil. In my opinion this makes
the dual igntion design of the 13B viable for aircraft use.

Ed Anderson
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