Building the Minimag

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Bogstandard:
Many thanks for all the good comments lads, I hope at least a couple of you have picked up a few tips.

Rob,

There a few way to fit it, and when the engine is built, the final decision will be made.

First off I could drive it from the main crank with say a 1/4" chain and sprocket, and reduce it down to half engine speed, that could be done from either side, and direction doesn't matter as it all depends on how it is magnetically timed, it can be driven either way.
But the favourite at this time is to take a 1 to 1 drive off the main engine valve cam, either directly mounted to, or what I am favouring at the moment, a drive gear or chain drive putting it to one side, and utilising the original points adjusting plate somehow, to allow me to easily adjust the ignition timing.

Basically putting it somewhere near where the original contact breaker points were to be. It all depends if I can squeeze it into the space.

John

John Stevenson:
John, You need a gear drive like this to get it to give a right flick.

Here's it in action :D

http://www.youtube.com/watch?v=zOmSrePm_UM

John S.

Bogstandard:
:lol: :lol: :lol:

But I thought I could get away with a one tooth gear on each part :bang:

Dean W:
That gear setup would drive people loony, and they'd never notice the engine or mag it was running. ; )

Bogs, it all turned out great! It's a good looking little unit, and as always your work is very instructive.

madjackghengis:
Well John, that is a very clean magneto, truly inspiring, and very neatly and solidly done. I particularly like the points set up, out of the way, but easy to adjust, my question is regarding a condensor, is there one in circuit somewhere? I have found a small magneto coil which looks about the same size or similar, on a weed eater engine, and I believe I can push the core, which is odd shaped, out, and push in a straight set of laminations, and try out building one using your demonstrated techniques on one which could fire nine cylinders, so I can use it on the radial build. I looked at those two you put the link to, and they look to fit very well where they're at, and should be substantially better than batteries and such. The aligator clip reminds me of the standard wire set up on all old cars, motorcycles and the like, with the end of the high tension lead having just a two pronged clip for connection to the plugs. This has been a great build log, and if my mag experiment doesn't prove out, I will be ordering a minimag kit I expect. Very nicely done, all around. :nrocks: :beer:cheers, mad jack

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