How does power get to the coil in eisemann mag

Hello,

Basically the name - magneto - tells how, well sort of. The magnet that is turned is quickly spun by the spring. When a magnet is passed, quickly, especially, past a coil of wire it induces a current in that coil. The more turns of wire and the speed of the magnet spinning past the coil causes the high voltage to be generated. So, there is no external connection that supplies any voltage to the magneto.

Now in a vehicle ditributer and coil, the 12 volt from the vehicle is switched on to the coil and when the points open the magnetic field very quickly collapses and the high voltage is generated.

I hope this very simply explanation helps.

Check out the Eisemann magneto manual here...
http://www.oldengine.org/members/diesel/Eisemann/MagData18.htm

Hello,

Basically the name - magneto - tells how, well sort of. The magnet that is turned is quickly spun by the spring. When a magnet is passed, quickly, especially, past a coil of wire it induces a current in that coil. The more turns of wire and the speed of the magnet spinning past the coil causes the high voltage to be generated. So, there is no external connection that supplies any voltage to the magneto.

Now in a vehicle ditributer and coil, the 12 volt from the vehicle is switched on to the coil and when the points open the magnetic field very quickly collapses and the high voltage is generated.

I hope this very simply explanation helps.

Check out the Eisemann magneto manual here...
http://www.oldengine.org/members/diesel/Eisemann/MagData18.htm

THANKS Mag Man.... I have looked at that... still can't figure out where to test the coil....


[quote="Old Magnet"]Check out the Eisemann magneto manual here...
http://www.oldengine.org/members/diesel/Eisemann/MagData18.htm[/quote]

There are no dumb questions, we are all learning something new every day, you can use a small piece of soft wire a few inches long to test the coil, remove the front cover (distributor plate) with the spark plug wires then mount the wire to the magneto body using a spare screw and one of the 4 small screw holes that normally secures the distributor plate, the other end of that wire set about 1/8" away from the brass tab of the coil then give the magneto a spin and you should see a nice spark jump from the coil tab to the wire, move the wire further away from the brass tab to test how strong it really is, obviously a fat blue spark is the goal.

This trick I was taught by Eddie Bedwell.
Good luck
Mike

THANK YOU Mike... but if it doesn't spark how should I test the coil.... I've been told the ohm should be 6300. but I don't know where to touch the probes of the multimeter.

[quote="Mike Meyer"]There are no dumb questions, we are all learning something new every day, you can use a small piece of soft wire a few inches long to test the coil, remove the front cover (distributor plate) with the spark plug wires then mount the wire to the magneto body using a spare screw and one of the 4 small screw holes that normally secures the distributor plate, the other end of that wire set about 1/8" away from the brass tab of the coil then give the magneto a spin and you should see a nice spark jump from the coil tab to the wire, move the wire further away from the brass tab to test how strong it really is, obviously a fat blue spark is the goal.

This trick I was taught by Eddie Bedwell.
Good luck
Mike[/quote]

THANKS Mag Man.... I have looked at that... still can't figure out where to test the coil....


[quote="Old Magnet"]Check out the Eisemann magneto manual here...
http://www.oldengine.org/members/diesel/Eisemann/MagData18.htm[/quote]

To help understanding the action in a coil, imagine you are blowing up a balloon. It takes a little effort and time to get it full. This is like applying a voltage to a coil. The current flow is rather slow (in terms of instantaneous time).

Then if you stick a pin in the balloon it "deflates" quite rapidly (POP!). That is similar to how fast the magnetic "flux" collapses in a coil when a voltage is removed. That is where the high voltage is developed. That is where the number of turns in a coil can produce upwards to 20,000 volts while the initial voltage is only 12 volts.

A magneto is simply using a magnet to "pass" it's magnetic flux through the coil wires quickly thus inducing a high voltage.

If you use a meter to test the coil you will see some small amount of resistance (I am not sure how much right now) but when you remove the meter probes the collapsing field will generate a high voltage then too. If you had your finger at the point where you remove either probe you will get a "ZAP".

The action is quite simple but is takes a bit of describing of what happens.