Can somebody tell me how to get the 20 and 27 degree timing without
resorting to two separate trigger wheels? Cementing the pickups side by
side
would be twelve or more degrees apart.
On another note: my Parker fuel pumps have a tag on them stating "Not for
aircraft use".

--
Karibian

Why 27 degrees? Most people fire both plugs
at 22 degrees.

I assume you are not using a computer for the ignition
system.

What kind of ignition modules are you using?
If you are using the second gen waste coil
module all you is one CAS pickup and two tits
on the trigger wheel. That will take care of
the Leading plugs. The Trailing plugs will not fire.

To fire the Trailing plugs another trigger
wheel with one tit and two CAS's will fire
two single plug type 2nd gen coils for the trailing
plugs.

The Corvette Chevy coils will require some
simple circuitry to work. I was about to develop
that as it is on my list of things to do.

Paul Lamar

I am using two ADIS-4, straight up with nothing else, and somebody on this
site mentioned firing the lead plug at 20% for starting and both for running
with the trailing plug at  27%. I've got the Ford double coils but am
planning on using the Renesis single coils that came with the engine.
I made the missing tooth trigger wheel the same size as the Renesis wheel
but could make one a maximum of 8 inches in diameter  and glue two magnetic
pick-ups together for a spread of 9-10 degrees.