Hi Paul and Vince,
  I may be wrong here but I have the impression that a single rotor
  engine
  fires like a one cylinder, 2 cycle engine. If that's true, then a 2
  rotor would fire like a 2 cylinder, 2 cycle engine. This is a common
  outboard motor configuration. My 2 cylinder 10 hp Merc is quite old so
  not representative of state of the art but it has magnets inbedded in
  the underside of a hollowed out flywheel and some sort of pick-up
  coils
  180 degrees apart that are in close proximity to the flywheel's inner
  surface.  Could these parts, purchased as OTS replacement parts, be
  used
  to fire a 13b? I can see where it's possible to fire 2 plugs but there
  are 4 that need power. Tracy fires leading and trailing
  plugs simultaneously and sees no difference in operation. Then there's
  the matter of ignition timing. My old outboard has the pickups mounted
  on a moveable plate centered on the crankshaft and a mechanical
  linkage
  from the throttle arm that rotates the entire plate. I'm not exactly
  sure why this setup even works because I see no "wound coils" like
  Paul's pictures show. The pick-ups appear to be a laminated metal
  construction similar to what you'd find in a clock motor. If any of
  this
  is interesting, Vince, at least there are no coils for you to wind.
  Any
  thoughts?   Dave M


The laminated cores have both the primary and secondary coils already
installed.
The throttle lever moves the throttle and the coil frames relative to
the flywheel.

When the lever (throttle) is in the start position, the timing is at
about 5 degrees or less
 and the throttle is just off idle. If the throttle is moved to a higher
power position, you may have trouble pulling the starter cord as the
engine tends to stop cold or spin backwards when it fires.

There is a cheap gizmo available at the lawn mower shop, that is used to
replace the points in mower engines. Just 2 wires. Probably an SCR that
opens as the polarity of the coil changes as the magnets go past the
coil frame. Great improvement for lawn mowers.

The coils need to be double ended like a MC coil with both ends on the
same housing.

The leading [lower] plugs can run on a wasted spark system, but not the trailing
[upper] plugs. One housing will always have an apex seal between the plugs,
exposing the next fuel air charge to the trailing plug.

Alternatively, you could run the trailing plugs from the two coils (180
apart, single magnet) and run the leading [lower] plugs as wasted spark from a
more conventional system (crank trigger MSD-6AL) and no matter what the
battery does, you can still come home on the trailings [upper].

Lynn E. Hanover

Here is a little dwg from the shop man to go along with
the one Lynn made and what what Lynn said.
In theory one would need only one trigger coil putting out 300
volts to fire both lower spark plugs with a waste spark system.
No battery no alternator.

Paul Lamar


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