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Minimag, another way to get your ignition sorted.

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Bogstandard:
I started a post over on HMEM a while ago, of which there seemed very little interest, so much for that being a dedicated model engine site. They have no idea what a good thing these are for the larger models, it makes them completely self contained

http://www.homemodelenginemachinist.com/index.php?topic=9150

So when this little unit gets here, I will see if the build on here will get a better response.


Bogs

John Swift:
Hi Bogstandard ,

I don't understand why there's little or no interest in it

I'm not an engine builder my self  , and at the moment would find it easier to build an electronic ignition

but the magneto is more in keeping with the engine

and if designed for the job and not the price can be more reliable (less to go wrong)

 John

MikeA:
Hello,

Being a neophyte in machining, I'm just completing my first engine, a Duclos Fire Eater but already am thinking of the next! Likely a hit & miss such as the Kerzel or one of the Upshur designs and the availability of this MiniMag will be perfect in my opinion (FWIW!)

Thanks for this information.

Best,
Mike

NickG:
Bogs,

I missed that on HMEM. I haven't built an i.c. engine yet but have always intended to once I have built up my skills enough.

The ignition was always a stumbling block. There are a few options, motorbike coils, points, battery etc but that is very bulky. Then these transistor electronic circuits seem to be popular. The problems I saw was they aren't self contained and are still quite expensive.

I agree the magneto is a much neater unit, more authentic and comparable cost but they are only really suitable as you say for larger model engines due to the physical size and power it takes to drive them. A lot of people do smaller engines to keep material costs down and to suit their equipment I guess.

I think for a large ish engine like you are talking about, the magneto has to be the only choice.

I am considering trying glow plugs when I make my i.c. engine because they are neat (although not authentic they can be made to look authentic) and cost effective.

I've never had one to bits but how do the ignition systems work on stuff like strimmer engines (about 20 odd cc) but they are self contained?

I will be looking out for your build when the unit arrives, very interesting. I will have to read up on them in Model Petrol Engines by Edgar T Westbury. Strange that my grandad should have that book (he wasn't really a model engineer) not knowing that years later I would become a model engineer!

John Stevenson:
I have often wondered about why they can't be split up and hidden away more to get a scale feeling.

Take Malcolm Strides Nemit engine, built from bar stock with a square lump or rather cube of alloy for a crankcase. If the magnets were fastened on the crankshaft, coil inside the crankcase and them a dummy magneto that looks like an original bolted to the outside of the crankcase.

The dummy is run from the crank and contains the contact breakers and the HT lead runs thru it and 'appears' to exit from where it should ??

Comment's, flames, bricks etc ?

John S.

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