DC CDI ignition wired to any flywheel that has a magnet.

[Darren]

Electronic ignition requires a reference point, trigger wheels (60-2) allow the computer to accurately configure timing
1) the correct position of TDC from the missing teeth 2) the precise measurement of the engine revving up and down, measuring the time difference between each tooth, we're talking milliseconds here. 30-1 is considered the minimum acceptable working resolution, my kit car is 120-2 because it's on the flywheel.
Basic electronic ignition can use a single point reference i.e. a magnetic pick up sensor, I watched the first video and didn't observe where the timing curve was programmed, is this predetermined? Ali express can supply an EFI kit that uses a magnetic pickup, I was going to purchase it until a detailed video highlighted it's drawbacks, one being a single trigger through 360degrees rotation.
Electronic ignition has several advantages over the basic magnetic coil, one being the strength of the spark, second the timing curve if it can be programmed.
The Speeduino works with tuner studio and is fully configurable, this is what I will be using on my build. I will be able to set my 'start up' timing to.. say 10degrees btdc, this may negate the need for a compression relief on the cam.
If the CDi is indeed programmable, being able to set it at 10degrees for start would be a great advantage.
I'll be watching this thread with interest

 

[Rat]

This really just seems like an unnecessary PITA. THE ONLY advantage over a stock type coil (A Dover non resistor specifically) is being able to advance or retard the ignition timing with any flywheel and stock key instead of using offset keys which don't work with ALL keyways.
(I have yet to find offset keys for a 1/4" keyway)

 

[Thepartsguy]

This really just seems like an unnecessary PITA. THE ONLY advantage over a stock type coil (A Dover non resistor specifically) is being able to advance or retard the ignition timing with any flywheel and stock key instead of using offset keys which don't work with ALL keyways.
(I have yet to find offset keys for a 1/4" keyway)

Not hard at all.

I believe capacitor discharge ignition would definitely be alot hotter then the stock coil.

These are the standard on four wheelers that get the absolute bag beat off them.

they are good ignitions. I’m making this one cheap. Then will buy a expensive setup that isn’t $15 china

 

[Thepartsguy]

I have an AC portable CDI box for any fourwheeler that has an AC CDI.. just plug this in to get spark back..

making a coil bracket for a 3-8hp Briggs would make it super easy to retrofit to any Briggs engine..

just like the AC cdi retrofits to any fourwheeler with an AC cdi.. extremely handy to have around.

 

[Thepartsguy]

I'll be watching this thread with interest

Everything will show up latest the 9th and I can make a coil bracket for the 3hp

 

[Thepartsguy]

They make CDI’s where you can take a flat blade screwdriver and adjust the timing by twisting the little screw in the blue square.


wonder If that could be used to any affect on a briggs??

 

[Denny]

I don’t see why not, if you can figure out the wiring.

 

[Thepartsguy]

I don’t see why not, if you can figure out the wiring.

It can be pinned with a meter easily so I’ll figure it out.

 

[Thepartsguy]

If you wired two coils into one CDI would it dump a spark at both plugs??

 

[Rat]

If you wired two coils into one CDI would it dump a spark at both plugs??

Maybe a weak spark, they'd be competing for voltage.
I think you'd have better luck with two CDI modules on one trigger or a CDI that is specifically intended for dual coils... even better yet there ARE dual fire single coils for twin cylinder engines (my 1970 Honda SL175 used one)

 

[Thepartsguy]

Sigh I‘m not sure why it didn’t hit me I’ll need the connector.. so another probably week waiting for this to ship we will get there eventually..

 

[Thepartsguy]

Anyways good news!! A guy in the forum posted the magneto demo model just 10 minutes ago!! So now I have a video of a demo model to study. And it does appear to open EXACTLY or just a hair before the trailing end of the magnet on the right leg of the pickup. So my thinking so far is extremely close.

 

[Master Hack]

It’s firing about 90 times a second. A few milliseconds ain’t going to make a difference.

??? isn't timing all about, ahhh, well timing? as accurately as possible? Am I missing something?

 

[bob58o]

A timing light, a degree wheel, and a piston stop are a few tools I’ve acquired since starting this hobby. New tools might be the best part of this hobby after knowledge and experience.

A video should give you a good starting point, so it’ll run. Then get the timing light on it and fine tune.

I was wondering if this ignition still fires on the exhaust stroke like the standard ignition? Or if the puter fixes that?

 

[Thepartsguy]

A timing light, a degree wheel, and a piston stop are a few tools I’ve acquired since starting this hobby. New tools might be the best part of this hobby after knowledge and experience.

A video should give you a good starting point, so it’ll run. Then get the timing light on it and fine tune.

I was wondering if this ignition still fires on the exhaust stroke like the standard ignition? Or if the puter fixes that?

I figure If the magnet passes under the flywheel it will still dump spark so i’m thinking it’s still a waste spark deal

 

[Rat]

I figure If the magnet passes under the flywheel it will still dump spark so i’m thinking it’s still a waste spark deal

That would be exactly correct and applies to almost every CDI, points and condenser, and direct induction ignition system ever designed.
Even a V-twin, P-twin, and O-twin has a wasted spark which is very often used to an advantage by having the valve timing between cylinders 180° opposed

If anything engines controlled almost exclusively by an ECM unit are the only ones that do not have a wasted spark.

 

[Thepartsguy]

Portable Dc cdi is almost finished and ready for testing on the Kawasaki fourwheeler. I also am in the middle of making some Briggs 3hp-8hp pickup coil mounts.

 

[Thepartsguy]

Both white wires to ground and the capped black wire to +12v also connect the spark plug wire. The pickup here is only wired for demo..

The wires can be shortened/neatened as needed. Going out now to wire it to the fourwheeler.

 

[Thepartsguy]

I had to travel deep Into the backs of the forums to find this diagram. Only one that seems to exist on the internet somehow I found it.

two yellow Ac lines out of the bottom
black/yellow to ground
brown to monitor
white to battery +

My dc cdi produces spark. And if the regulator works I’ll have a charging system. That means on that quad at least no more direct loss ignition system anymore.

 

[Thepartsguy]

3-8hp coil brackets courtesy of Gilbert 1972