Mark Steitle wrote:

Quoting Paul Yaw's web article on Combustion and Ignition -Part One

(http://personal.riverusers.com/~yawpower/techindx.html) he states, "In the
real world we do not have this option because the fuel does not burn fast
enough to complete the combustion process within such a narrow range. ...you
will realize that the power output of the engine can be increased by
increasing flame speed.  Increasing the flame speed will release the energy
from the fuel in a shorter period of time.  This will allow more effective
use of this energy by timing the combustion process to more closely match
the torque transfer curve of the rotor/eccentric shaft combination."  If it
really is beneficial to increase the flame speed, then wouldn't firing both
plugs at the same time help to accomplish this, resulting in more power at
the flywheel?

End of quote.

Al Gietzen wrote:

My understanding is that propagation speed of the flame front has to do with
mixture, compression ratio, fuel volitily, etc., and would not be affected
by whether you fired one plug or two.  Paul  has told me that firing both
leading and trailing at the same time will reduce effective "power range",
but will make little or no difference in the power at the RPM we run our
engines in an airplane.

Al

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