Here are a few charts from Heinz Heislers book Advanced Engine
 Tech and others. The first chart shows that; as the fuel air ratio gets
 real lean and the pressure lowers in the combustion chamber
 at high altitude the voltage required to fire the plugs goes up.
 Klaus has exploited this situation to lean his engine out
 at high altitude and improve the BSFC to remarkable levels
 by increasing the spark voltage. He has achieved as much as
 100 MPG at 130 MPH and 60 MPG at more reasonable cruising speeds.
 This is a piston engine where the spark plugs are at one end
 of the fire and the piston is at the other end.

    In our case we have a moving combustion chamber where the fire
 travels along side the spark plugs for quite some time. IMHO We want
 the spark plugs to continue to fire for as long as the unburned
 and burning mixture is still present moving past the plugs. That takes
 8.3 ms at six thousand RPM cruise RPM. See chart 2.

 A capacitor discharge ignition system  is very good at firing
 spark plugs fouled with 100 LL but it only fires for .2 ms. Even
 an inductive system (Chevy LS1 coil) or stock Mazda ignition
 only fires for about .8 ms.

    IMHO NO WHERE LONG ENOUGH FOR WHAT WE NEED!

 IMHO we need an ignition system to fire for 8.3 ms or 300 degrees.

 TEN times as long. MSD makes a multiple spark capacitor
 discharge ignition system widely used by Mazda rotary
 engine racers but it only works up to 3000 RPM. After that it
 is "one strong spark" says MSD. Not enough in IMHO. This is why
 I am doing a m.s.d. ignition system with several pre-charged
 capacitors fired in rapid sequence by a cheap single chip computer.
 I hope this is a break through in improving the BSFC of
 the rotary engine. I think it is worth a try.

 Patent applied for :)

 --------------------------------------------------

 This is the range of rotor positions I intend repeatedly firing the spark
 plug. Mostly the leading plug (lower plug) as one does not want to risk
 igniting the mixture in the following chamber.

 Paul Lamar

Good going Paul.  We need the long duration.  Will be very interesting.
Sure wish we access to the Mazda factory development notes and a supply of
the three sparkplug rotor housings the Mazda factory built for the R26B
LeMan's engines to improve efficiency.

Steve Beckham

Could you please attach the charts?

John Fair

I did John. Do you have your browser set to automatically display
attached jpg's/

Here they are again.

Not the rotor positions as that is over a meg.
Let me know if you need them again.

Paul Lamar