Ignition modification to get motor to run 8 degrees after Top Dead Center

[CompuTutor]

Look,
The minimum IS a set of points on the intake valvetrain,
to augment the OEM points still installed and set retarded,
thus killing the waste spark every other crankshaft revolution.

One single wire from OEM points,
one (additional) set of points,
one hour or so ...

Or move the sensor currently used (and It's magnet)
from the current crankshaft location to the camshaft.



But I really wrote this to introduce another workaround.

There seems to be a growing number of indications from people
that need to harvest power from magneto-ignition style engines
that basically have no other electrical sources to use for this use.

I think electronics on ANY motor is pure folly,
but I'll contribute this alternative thoughtware. 



Solution, MOUNT A SECOND ONE:
(Mount a second ignition coilset)

For the most part, most of these keep it simple,
just a magnet in the flywheel is the starting point.

Better versions also have laminations in the flywheel
that bring the other magnet's pole around each side.
(N-S-N  or  S-N-S with the center being the magnet)

Then a stationary open ended "W" frame laminate core
with the center post wound appropriately for the task,
is designed to match the center and two outer flux paths
just like a standard transformer with removable end strap.
(One primary center flux path, dual secondary flux return pathes)

The center pole with the windings gets one pole of the magnet,
while each of the two side laminates (both) get the magnet's other pole.

So rewinding one with a split-length on the two outer poles,
and a second full length wound on the inner pole seperately,
both going through their own FWBR to an electrolytic capacitor
would yield enough power for a simple CDI/coil combo.

there is always room if it is ID mounted (Like a lawn mower),
and not a terrible hassle if OD mounted like newer generator's.



You've got a magnet already mounted,
and it is turning already for you to use,
scavange it with a series of small spools
if that is your current expertise level...

Just remember to use FWBR (Full Wave Bridge Rectifiers)
because both the full "W" frame and even single spools
will inccur both poles from the magnet (NSN / SNS).

Hope this helps somehow.

But I (still) think electronics is a HUGE mistake on engines
If modern motors (Engines...) ran on hydrogen in the first place,
or the playful new variant supplying It's own oxidizer too
(HHO/Browns/Ohmasa) WE WOULDN'T NEED ELECTRONICS.

You would regulate the gas and air throughput
via a valve body like a traditional carburetor does now !

Make a few new holes in what you have,
make a bigger timing plate instead,
anything to retard the timing.

Then add a second set of points to the OEM,
that close when the intake starts to open
to kill the waste spark.

They will never die or fail ever,
the oil prevents that, I know...

[altium]

@Stefan, I see mistake in your CDI schematic:

You must add diode parralel to output thyristor (connected in primary stage of ignition coil) for keeping resonant oscillations in this coil. With this method, you will get couple of sparks instead of one spark. And of course you will decrease voltage peaks on thyristor in reverse direction.

See this old (but very good) russian resonant CDI invention, named "OH-427": http://shemavto.ru/on427.html

Later improvements of these russians CDI is named "plasma ignition" (see "plasma_ignition_original_russian_schem.PDF"). It includes resonant CDI module + TCI module.

On scope shots there is secondary voltage of ignition coil, we can see 2 stages:
1. First firing CDI with couple of strong fading resonant oscillations.
2. Next firing TCI for holding plasma arc.
Summary duration of "plasma" named spark is 6 time more than in usually engines (0,45ms CDI + 2,5ms + 2,3ms TCI).

With this principle, russians are reach Euro 3 without catalytic converters long time ago in 1990-th years.

I attach schematic of last russian combined plasma ignition "Plasma ignition Schematic Prints v1.0.pdf" writed from me and containing CDI+TCI module. But we need ONE improvement in this schem: ground of CDI and TCI must be common. Because if "+12" line is common like original schem (ignition spark passes through "+ wire" of installation and through car battery), it will be generate very big noise in automobile installation. We do not need this.

Future improvements can me maked by replacing two transistored one shots in this schematic with two IC 555 one shots. And DC-DC pulse converter can be realized with MC36043 or other IC.