1930 LF dynamo?

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torbjorn.vik
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1930 LF dynamo?

Postby torbjorn.vik » Thu Nov 30, 2017 6:54 pm

Does anyone know whether (and if so, where) it is possible to source a dynamo (6V) which will fit in the appropriate holes on an 1930 LF?
1929 Ariel F,1930 LF, 1934 VA31,1951 SQ4, 1957 Huntmaster, 1942 BSA WM20, 1927 Husqvarna mod 180,1969 Honda CD125, 1971 CB450, 1971 CB750

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Dave.Barkshire
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Re: 1930 LF dynamo?

Postby Dave.Barkshire » Mon Dec 04, 2017 9:52 am

They are very rare. Think that Colt owners might upgrade to a standard sized dynamo. A Colt owner should be able to advise you on this.
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torbjorn.vik
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Re: 1930 LF dynamo?

Postby torbjorn.vik » Mon Dec 04, 2017 7:23 pm

Thanks, I would really appreciate some advice on this from those who have found a solution. The holes are 2.5 inches in diameter. I have a spare set of engine mountings, but no amount of measuring and drawing indicates that it is possible to enlarge the holes to fit a 3’’ dynamo. There just is not enough metal?
1929 Ariel F,1930 LF, 1934 VA31,1951 SQ4, 1957 Huntmaster, 1942 BSA WM20, 1927 Husqvarna mod 180,1969 Honda CD125, 1971 CB450, 1971 CB750

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Re: 1930 LF dynamo?

Postby Johnguppy » Thu Dec 07, 2017 10:45 am

Are you referring to the dynamo driven from the engine sprocket via a small chain or a Mag/dyno , I think you mean the front driven dynamo , I did see a few 3 brush dynamos at Kempton park , and to my surprize a guy and his wife selling oil that had 3-4 brass end caps now if you wanted one of those they are rare
1929/31 had the front driven dynamo , if you are intending to keep orginal you will need a very early headlight switch with 4 positions if anyone wants to know how to modify the modern repo switch I can help

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Dave.Barkshire
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Re: 1930 LF dynamo?

Postby Dave.Barkshire » Thu Dec 07, 2017 12:22 pm

Apart from the Colt dynamo being physically small in size I have some vague recollection that they were 4 volts? May I am imagining it. I have sent a PM to Torbjorn.
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adrie.degraaff
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Re: 1930 LF dynamo?

Postby adrie.degraaff » Thu Dec 07, 2017 1:10 pm

torbjorn.vik wrote: The holes are 2.5 inches in diameter. I have a spare set of engine mountings, but no amount of measuring and drawing indicates that it is possible to enlarge the holes to fit a 3’’ dynamo. There just is not enough metal?

There could be a middle; maschine 6mm of the dynamo, on one side, until the second engineplate and 6mm out of the engineplates hole.

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Re: 1930 LF dynamo?

Postby nevhunter » Thu Dec 07, 2017 8:04 pm

What about the dynamo on a C10 , C11 BSA. They are 6 volts. Not sure of the diameter but I think they are smaller than the "normal" one Nev

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Re: 1930 LF dynamo?

Postby bruce.carrad » Thu Dec 07, 2017 8:54 pm

Hi, don't know if it's any help but my first Ariel (many years ago) had a front mounted generator which I thought at the time was not original, don't know why except that it had a strange looking end cover, diameter reduced in 3 steps from memory. I remember thinking it might be Indian but perhaps not. I have a E3L dynamo, magdyno type and it is 3 inches diameter so the correct dynamo might be a special for Ariels. I had the bare frame of a 250 like yours which I found under a house a few years ago, since sold.

torbjorn.vik
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Re: 1930 LF dynamo?

Postby torbjorn.vik » Wed Dec 13, 2017 4:00 pm

Hi, thanks everyone. It is the front driven dynamo. I checked in the Black Ariel book, and they were indeed 4 volts. So I guess they became rare as bulbs became unavailable. I have an electrical wizard nearby who can build almost anything inside a case, so should be able to convert to 6V if I had the remains of a 4V one. The dynamo drive sprocket and cover etc are there, and the despatch book from Ariel confirms that it was exported to Norway in March 1930, and had lights fitted as extra. The original headlight case is also there, but needs some repair and strenghtening, as it seems to be made from tin foil, it is so thin. I also have three sets of front engine plates, so can experiment a little with widening the holes if I had a dynamo that just might fit. Will check whether I can get the measurements for a BSA C10 one.
1929 Ariel F,1930 LF, 1934 VA31,1951 SQ4, 1957 Huntmaster, 1942 BSA WM20, 1927 Husqvarna mod 180,1969 Honda CD125, 1971 CB450, 1971 CB750

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Re: 1930 LF dynamo?

Postby j.coleman » Fri Dec 15, 2017 8:01 pm

Hi, the late 1930 colt had larger front engine plates to accommodate 3" 6V dynamo. The right plate had a clamp attached
20171103_211632.jpg
like this
20171102_113410.jpg
I can draw around them if that helps. Jim


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