Actually I was thinking about using a single
cylinder motor cycle type of magneto directly on the crank for the trailing
plugs. At first I was going to use a snow mobile type (I have a few laying
around) but then I realized you couldn't use waste spark on the trailing
plugs &#%*$!
I would just add another coil and ignition pick
up to the motorcycle unit 180 deg out of phase. If I was really ambitious I
could even add a couple lighting coils and have a (weak) back up to the
belt driven alternator. Probably I am not that ambitious since the
battery gives you some reserve if an alternator fails. If the battery fails
you are sol either way...but the engine keeps running.
reasons for the motorcycle mag:
1) cheap
2) no distribution problems, each plug has it's
own coil and wire.
3.) no high altitude arcing.
4.) cheap
For fuel, I was thinking about using a kinsler
style fuel injection. Should be relatively easy with the rotarys linear power
curve. No falling off on the top end means you don't need a high speed bypass
circuit. Should be able to control the mixture with the barrel valve. Of
course it will not be as precise or automatic as EFI. Should be just as good
in cruise once you get everything dialed in which is where it counts
anyway. The big benefit is I could disconnect the battery and the engine
would loose some rpm, but it would keep running.
Proper shut down procedure (using the fuel
shutoff) should prevent the chance of firing when switching on the ignition
(still should yell clear before touching the switch, if it jumps pilot must
wear a hair shirt for a week for failure to follow shutdown
procedure)
Motor arrives tomorrow.
Monty