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BTH magneto codes
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TOPIC: BTH magneto codes
#8331
Re: BTH magneto codes 3 Weeks, 3 Days ago  
I wonder how often Rudge used BTH magnetos with the "oil flinger" on their racy bikes? There are a couple of drawings (M4011x1 "BTH Dirt Track Magneto", December 1932, and M4057x1 "Base for BTH Racing Magneto", April 1933) that show the magneto with the oil flinger between the taper and the magneto body. Earlier baseplate drawings (see earlier in the thread) are for magnetos without the flinger.

Does a 1933 TTR have an oil flinger on its BTH TT Magneto? A 1933 Syndicate racer?

Cheers

Leon


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Leon Mitchell
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#8342
Re: BTH magneto codes 2 Weeks ago  
Leon
I checked my '33 D6 mag, and there's no evidence of an oil flinger. But since, as we've previously discussed, this particular mag seems to have been rebuilt at some point, this doesn't provide a definitive indication either for or against the fitting of flingers.
DS
David Sproule
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#8343
Re: BTH magneto codes 2 Weeks ago  
Thanks Dave. One thing I have found is that 1933 BTH racing magnetos are pretty rare, so it's quite possible that your flinger-less mag is correct. Because there are drawings with and without the flinger, I suppose both were used at some time or other.

Leon
Leon Mitchell
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#8346
Re: BTH magneto codes 1 Week, 1 Day ago  
A typical BTH KD1 D4 magneto from mid 1935:
www.ebay.co.uk/itm/282806944351

This one - serial number 5E452476 - is the earliest I have on my list, so at the moment the answer to the question "When did Rudge replace the BTH KC1 D4 magneto with the KD1 D4?" is "on some late 1935 models", but it could be earlier. If anyone has an earlier number on a KD1 D4 I'd be interested to hear.

Cheers

Leon


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Leon Mitchell
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#8347
Re: BTH magneto codes 1 Week, 1 Day ago  
Hi, I don't think it is necessarily about what BTH produced but what RW fitted and what they had in stock. The KD1 and KC1 magnetos have a different body height and required a different magneto strap. The KC1 used M3223 x 1 and the KD1 the x8 version. The spares lists show the change year as 1936 for KD1 in terms of the strap but the x8 version was drawn in November 1934 which is early into the 1935 models. The spares list was drawn up late in 1934 and, although RW did produce errata for spares lists, none was produced for the 1935 spares list, so the strap remains at the KC1 type. Exactly when RW changed over would also depend on what stocks of magnetos they held, rather than what BTH were producing but it is likely that for an expensive item like a magneto, RW would only hold limited stock. I think it is reasonable to say that RW probably fitted KD1 magnetos to the machines from say January/February 1935 - my specifications reflect this - Colin
Colin Chapple
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#8348
Re: BTH magneto codes 1 Week, 1 Day ago  
Perfect - thanks for that. I agree completely.

Interesting that the strap drawing has a strap for a Lucas Racing Magneto. How amazing that all these drawings have survived!

Leon
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