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    I used to be a previous member, but bad health in the family and myself curtailed my actions for a couple of years.

    Previously, we had a discussion on here about the Jim Shelley Minimag, and how it was unfortunate that it had to come to an end due to Jim's ill health.

    I actually kept my finger on the pulse with this little marvel, and soon, if all goes well, it will be rising like the Pheonix from the ashes.

    I am in touch with the new owner, who already has a couple of the prototypes running. The main difference from the original is that it will now work at much lower revs, where previously it required mechanical means to get to a running condition, hopefully now, it will be able to work on hand cranked engines, such as hit and miss types.

    I am actually just finishing off a prototype kit, following the supplied build instructions and plans as a proving exercise, in the hope that Julian, the new owner, will be able to offer the updated Minimag back onto the market in the very near future.

    This is the build sequence I have just gone thru.


    I hope this will put a bit more spark into those who wished they never went off the market.

    Hello Bogs!

    Just because you fell into bad health dosen't mean you are not still a member!!

    I will click the link and check it out. Thanks for posting.
    • CommentAuthordavid
    • CommentTimeFeb 7th 2011
    I read all 4 sections. I have been interested in magnetos for a long time. I was talking with a fellow at one of the engine shows a few years back with a bunch of parts in a briefcase.
    If you would like a place to post just your story without rest of the thread let me know.
    Along those same lines if anyone else want to do a long construction article or how-to we have space.
    David Kerzel
    I reregistered Steve, I just couldn't remember my old email addresses, logon name and passwords. It was much easier to start from scratch.

    Here is a link to his website. If you look about on the opening page, it shows a vid of the little item driving a full sized Lister stationary. If it can do that, then I am sure it can cope with whatever we can throw at it.



    I always thought this site was a text only one, except for the gallery etc, hence the reluctance to show anything I have done.

    In fact I do have a copy of the whole lot, without all the comments etc, which I always do until it is all done and dusted with on other sites.

    I still have a little more to add to that post, as I am doing a few mods of my own to the Minimag. But that should all be finished with in a couple of days.

    • CommentAuthordavid
    • CommentTimeFeb 20th 2011
    John Moore sent a copy of his step by step Minimag build from the blog with photos and it is posted in the Tips section in the left side menu and also in the Related items section of the gallery. This is a wonderful detailed article about building the magneto. John, thanks for sharing it with us.

    If anyone else has a construction tip, construction story, work in progress, please take a few moments and share your work to inspire others.

    Good write up! Thanks for taking the time to take photos and write the article.
    I'm glad you enjoyed the read. I would also like to thank David for all the time he has put into the project to get it to a standard where it could be posted.

    Unfortunately, when you are trying to explain things in full, the text and pics do seem to grow very quickly into a lengthy posting. If it helps because of the way everything is formatted, I always put the text BEFORE the picture, so you might get text at the bottom of one page, and the picture on the next.

    Hopefully, after reading it, you should be mentally prepared for what is required if ever you decide to go down this route when eventually they are made available.

    The vendor has already said that he has taken on all my comments, and that has delayed the release slightly, as he is busy even now, redrawing and modifying the plans and build instructions to make them easier to understand.

    I actually sent my Minimag back to Julian, the retailer, because I had no way of testing it on an engine.

    Julian actually rough mounted it onto a Webster, and here is my Minimag doing it's thing.

    • CommentAuthorjay rich
    • CommentTimeFeb 22nd 2011
    wow i would love to try to bulid one i do have a ? could this work on my j 8 i would love to to know i am realy blow away i have tried in th past looking around junk yards and looking at old mags for 4 and 6 cylinders but not a 8 let me know hey steve your bugatti with a mag maybe?
    I think with something like a multi cylinder engine, you would have to speed it up some in direct relationship to the crank speed to get enough sparks per revolution, and then feed it thru a distributor to get the spark to the right place at the right time.

    With a single cylinder four stroke, instead of using a reduction down to cam speed, you could just run it at crank speed and use the 'lost spark' method. That way this little beast would be running at a better optimum speed.

    • CommentAuthordavid
    • CommentTimeFeb 23rd 2011
    How much torque or how hard is it to spin the magneto?
    Once it is spinning David, very little at all.

    As the rotor turns, imagine an up and down slope. As it comes to the peak it gets harder, but once over the top, it actually pushes the rotor around until it starts to climb the next slope.

    If I wanted to compare it to something, maybe turning over a Cox 049 or the next size up.

    • CommentAuthorjay rich
    • CommentTimeFeb 24th 2011
    so if i gear it like in a cam but have the big gear on the crank and the cam gear on the mag you think it would spin it up to speed ? ....jay
    Never having done it, and it was only a theoretical suggestion, the only way to find out would be to try it yourself.

    I suppose on full sized magnetos, they would have the internal capacity to supply more than one spark per revolution, depending on how many banks of magnets they have in the rotor and how many cam lobes it has.

    The minimag has two magnet banks, so in theory, if another cam flat was added at 180 degrees to the first, it could fire two sparks per revolution, but I would have no idea if the stored energy would be enough to fire a spark of any intensity to be of use in that configuration.