Author Topic: Vintage Sparks  (Read 314 times)

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Adrian II

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on: November 05, 2020, 12:25:11 pm
After a bit of respite, the magneto madness has struck again, this time a lovely pre-war BTH K type showed up on ebay.





(Note: seller's pictures from ebay)

Off to the garage to see how well or badly it fits an Indian-built iron barrel bottom end, AVL top end thrown on for looks.



It seems to fit pretty well, no larger than a Lucas SR1 or magdyno on the Redditch models, so it will just need the usual carburetor spacer, I don't think there will be too much problem lining it up for the drive pinion or getting it securely fixed, the slots for the magneto strap are still there on Indian Bullets, though having seen the work on Grumbern's Project Laubfrosch, i think a little light milling on top of the oil tank might be needed.

The thing still puts out some reasonable sparks, too, though an overhaul might be a wise precaution. The older style manual advance and retard also still works, it just needs a top bracket along the top of the front bearing housing to fit the cable.

A.
Grumpy Brit still seeking 500 AVL Bullet perfection! Will let you know if I get anywhere near...


grumbern

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Reply #1 on: November 05, 2020, 04:18:48 pm
You could make a bracket that goes under the top rear (5/16") oiltank stud to hold the cable, like an "L" shape.
Or even attach one to the cylinder head steady lug on the frame. This would require quite a bit of open running wire though.
Keep posting updates please. There are many ways to success and I'm excited to see which one you will choose :)


Adrian II

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Reply #2 on: November 05, 2020, 09:03:58 pm
When the magneto was originally fitted to the Spagforth Whippet or whatever, there would be a simple 2D bracket mounted to the top of the front bearing housing, which is drilled and tapped 4(?)BA to suit. The outer end of the bracket would have curved round slightly and been drilled and tapped at the outer end for the advance/retard cable's threaded adjuster. This would have kept the bare length of inner cable to a er... bare minimum.  :P

The alternative would be to use the later type of manual advance end housing for the bearing and the points with the internal mechanism, as used on the KC1 mag on my other project.

A.
Grumpy Brit still seeking 500 AVL Bullet perfection! Will let you know if I get anywhere near...


Adrian II

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Reply #3 on: November 20, 2020, 11:57:07 pm
OK, so I have this lovely old magneto and a set of Indian-built 500 Bullet crankcases which, unlike their Redditch forebears, were not intended for magneto ignition, they swapped to battery and coil ignition, with the contact breaker drive assembly or “distributor”, if you must, bolted directly to the back of the crankcase.

Now if you wanted to fit a Lucas SR1 magneto on a pre-EFI Indian Bullet, you could bolt one straight on in place of the “distributor”, it would just need the external auto-advance unit to fit it.

However, how do you fit a platform magneto rather than a flange-mounted magneto to a set of Bullet crankcases with no magneto platform? Well, if you’re Grumbern, you set the crankcases up in a milling machine and make a surface flat enough for a platform, I refer you to the Project Laubfrosch if you want to see how an expert does it.

https://forum.classicmotorworks.com/index.php?topic=27215.0

I don’t have a milling machine. Is there some other way? Yes, I think so. ;)

Let’s start with a 90° chunk of alumin(i)um angle, 4”x4”x4”. I need to bevel the corner a little.



Now I have already used the finger sander to flatten the crankcase joint a bit, but this is not a precision instrument (as if I had any), we need to see how much more work needs to be done. Now if I coat the top of the oil tank with some engineer’s blue, I can keep the angle with the vertical pressed against the machined face on the back of the crankcase, and by scraping the horizontal edge along the top I can see where the reamining high spots are.





Hmm, that’s not very flat. Pass me the scraper. A bit of work and another pass of the “L” and there’s a teeny bit more flat surface! This is not a quick job…



Eventually it gets to the stage where there’s enough flat surface on to pf the oil tank to change technique, so I can wrap some coarse wet-and-dry around the base of the angle and give it some welly.



Keep at it, and a larger recognizable flat surface starts to appear. Ah-ha!



After a while, it should be possible for the mag to sit square on top of the oil tank with the back of the mag true against the back of the crankcase. Is it? Does it? Yes and yes. :)



There's still a fair bit to do, I haven't finished with that piece of alimun(i)um angle yet.

Don't worry about stuff finding its way into the oil tank through the breather union hole, by the way, the cases will all be stripped down and cleaned.

A.
Grumpy Brit still seeking 500 AVL Bullet perfection! Will let you know if I get anywhere near...


heloego

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Reply #4 on: November 21, 2020, 06:06:07 am
Coming along nicely, Adrian!Keep the pics coming!  ;D
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grumbern

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Reply #5 on: November 21, 2020, 08:26:48 am
Ok Adrian, now I understand! :D
Well, this is a possibility. It might take some time, filing, scraping and sanding, but will do as well!
It seems to me the 500 cases are much straighter/flatter than the 350 one I had, where I had to remove ~3mm of material to achieve a right angle!
Keep up the good work! Maybe I will be able to fire mine up for the first time soon. Let's see who's first! ;D
Andreas


Adrian II

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Reply #6 on: November 21, 2020, 10:53:59 am
You will be first, this is a bit of a side project, yet another distraction from getting my other ones finished!

A.
Grumpy Brit still seeking 500 AVL Bullet perfection! Will let you know if I get anywhere near...


grumbern

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Reply #7 on: November 21, 2020, 11:13:10 am
If you're a gearhead, less then three projects at the same time counts as boredom 8)

I have about five right now, three being motorcycles... ::)


Bilgemaster

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Reply #8 on: November 21, 2020, 04:21:42 pm
I really like that B-TH logo. It sort of reminds me of those ancient coins from Syracuse in Sicily with the dolphins.


Syracuse was also big on that triskelion three-legged  symbol, still used on the Sicilian arms, but also by the Isle of Man, of TT motorcycle racing fame...

So badass my Enfield's actually illegal  in India.

Legal enough to pass muster if they don't look too closely in Woodbridge, Virginia, where the buses don't run at night, holidays or weekends


Adrian II

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Reply #9 on: November 21, 2020, 08:24:35 pm


The next dolphin-watching cruise departs in half an hour...

A.
Grumpy Brit still seeking 500 AVL Bullet perfection! Will let you know if I get anywhere near...


Adrian II

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Reply #10 on: November 21, 2020, 09:16:06 pm
Careful with those curly bits!  :o

Grumpy Brit still seeking 500 AVL Bullet perfection! Will let you know if I get anywhere near...


AzCal Retred

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Reply #11 on: November 21, 2020, 09:49:17 pm
The Procter & Gamble pic with "horns" & "inverted 666" reminded me of the pretzel logic displayed by an anti-vaxxer I overheard in line at the hardware store today. He was banging on about Luciferase being in the C19 vaccine and being used to "mark" people. "Are you a Christian? Why, that's the "Mark of the Beast"". Too much Fox Noise & internet time. Vaccines aren't all bad - after all virtually everyone in my parents generation knew someone that suffered from polio. It's a welcome change to be in a forum where everyone knows that the physical universe is completely indifferent to your wordplay...

https://www.tmc.edu/news/2020/07/fireflies-help-kindle-new-tests-and-treatments-for-covid-19/
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Bilgemaster

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Reply #12 on: November 22, 2020, 05:42:08 am
Sweet Baby Jeebus, they had to call it LUCIFERase? Why not Satanade? I had thought of immunologists as generally being fairly bright folks, but that's pretty dumb. Or maybe they really are trying to cull the herd.
So badass my Enfield's actually illegal  in India.

Legal enough to pass muster if they don't look too closely in Woodbridge, Virginia, where the buses don't run at night, holidays or weekends


Adrian II

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Reply #13 on: November 22, 2020, 08:23:38 am
https://en.wikipedia.org/wiki/Luciferase

That name will surely feed the conspiracy theories. I'd better post some more on topic content soon!

A.
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grumbern

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Reply #14 on: November 22, 2020, 06:04:43 pm
Pretzel logic - what a phrase! I'll instandly add this to my vocabulary! ;D
Funny thing though about the Pretzel itself: In German it is written with a "B" instead of the "P". I don't know why, maybe Americans wanted it to sound even more German than it does? Ok, enough linguistics, on with ignition...