Inducing some voltage from rotating flywheel magnet.

[thudpucker]

I have an "E" shaped Ferrite piece. I intend to wrap wire around each leg of the Ferrite.
Snuggle the Ferrite up next to the flywheel of a 5 Hp B&S lawn mower engine.
The object is to power a Needle Valve in the Carb through induced voltage.:-D (invention)

I dont know what kind of induced voltage to expect. So I don't know what size or number of turns for the Wire wrapped around the legs of the Ferrite.:sad:
Any ideas? Where or how would I try to figure out the first step?

 

[srizbf]

for a voltage to be induce in a coil , a magnetic flux must exist.

where do yo have the magnet in the lawn mover ?

your invention is

---------- Post added at 18:56 ---------- Previous post was at 18:53 ----------

on seeing your invention idea , with the magnet on flywheel ,
the coil must be very close to the magnet with small gap.

if you know the fluxdensity and speed of fly wheel , i think you can estimate

 

[thudpucker]

In the picture, you can see the Magnet embedded into the flywheel.
On the Inside where the Ign coil is, the air gap is .010 or so.
I was hoping to put this "E" coil outside the flywheel. But that would make the Air gap about 1/4". I can still feel the energy of the Magnet on the ouside of the Wheel though.

The question is How to figure out how much I have to work with.

If I had room under the Flywheel, I'd make three or four Ferrite/wire coils with a very small air gap.

I need about 5-12 Volts to make a Coil pull out a Needle valve, and then drive the Needle valve back into it's seat.
A Home made, electronic driven, fuel induction system that will never clog or leak is what I'm going after. I don't care if somebody else steals the idea and makes it work. As long as I get the benefit of it.

 

[FvM]

It's quite usual to have a generator powered by the flywheel besides the ingnition coil. My outboard engine has it to charge a battery or supply a navigation light. The problem is however, that the magnet has sharp poles on the flywheel inside but only a diffuse stray field on the outside. It won't give much induced voltage and less power. You can however place a testcoil at the core and measure the available voltage.

 

[thudpucker]

You bring up a good point. Your OB has a Ring of coils, with a set of magnets whirling outside the poles of the Coils.
Exactly almost the same as an Ign Coil.
Normally to do what I want to do an Engineer would make a coil or set of coils inside the flywheel magnet with a narrow air gap.

I'm trying to Engineer an induction system to an engine that had none! It cannot charge a battery, just makes a big Spark.

It's a booger of a problem because there is speed involved.
If I made a coil around a very light but spring loaded Needle valve, I could pull the Needle shaft up with very little voltage. But those small voltages take time to develop.
At 3500 Rpm, the Needle would need to pulse 1700 times per minute and lift .030 for 250ms on each pulse.
At Idle (800Rpm) it would pulse 400 times a minute but only pull up the same .030 for 50ms.

You can see why I came to you guys for help. That's a lot of figgerin!

 

[thudpucker]

Am I on the wrong forum?
Is there another Forum where the Posters work with Magnets?

And...would I be winding my coils with small wire, IE: 22 Awg, or bigger stuff?