Author Topic: B29 Finished  (Read 534 times)

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Offline cycarmark

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B29 Finished
« on: 23 Jan 2023 at 13:32 »
I finally finished restoration of my B29 and wanted to thank all the folks on the forum who provided parts, drawings, help, information, and plenty of support and inspiration to see it through.  It's a great riding bike, the smoothest running British twin I've ever ridden.

Offline douglas1947

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Re: B29 Finished
« Reply #1 on: 24 Jan 2023 at 07:33 »
Congratulations to your very nice and good looking bike, well done.
I hope you enjoy it riding.
Michael

Offline hoejmark

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Re: B29 Finished
« Reply #2 on: 24 Jan 2023 at 09:36 »
Beautiful bike.
You can look foreward to riding it. I really like to ride mine.
It doesn't seem that the pancake dynamo is connected to the system?
hoejmark

Offline cycarmark

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Re: B29 Finished
« Reply #3 on: 24 Jan 2023 at 15:05 »
The pancake dynamo is connected, if you zoom in you can just see the blue wire coming out of it to the wiring harness.  I'm not sure how well it works, but it does put out a little bit of power!

Offline arturro

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Re: B29 Finished
« Reply #4 on: 25 Jan 2023 at 09:28 »
Looks great . Congratulation
Best regards from Poland
Artur

Offline cardan

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Re: B29 Finished
« Reply #5 on: 25 Jan 2023 at 10:44 »
Well done Mark - that's a really super restoration. The finned valve covers, in particular, look fantastic. I've just re-read your old posts - from 2018-on - which really emphasize your efforts to get the details right, and also remind us of how useful the forum is! I hope you're pleased with the outcome.

Leon

Offline cycarmark

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Re: B29 Finished
« Reply #6 on: 25 Jan 2023 at 16:58 »
I really like the bike, it is an easy starter and is comfortable cruising around town.  The low seat height is also nice. 

The finned valve covers came out great, I drew plans for them and a local machine shop made them, amazing what 37 minutes of CNC machining will do!

The help from this forum was absolutely necessary on this bike, since there really is no repair manual (like for BSA and Triumph) all the forum folks who have worked on these and posted information was fantastic.  Also, since my bike was missing things like the generator drive clutch, and the exhaust valve lifter mechanism, the drawings and parts provided by forum folks made the job doable.

Offline douglas1947

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Re: B29 Finished
« Reply #7 on: 26 Jan 2023 at 07:48 »
Mark,

I have noticed you have made new valve covers.
I have only the rear cover and no front cover. So my bike runs without covers. Do you have the possibility to make a further pair or only the front cover for me?

Michael

Offline hoejmark

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Re: B29 Finished
« Reply #8 on: 26 Jan 2023 at 09:36 »
I made some magnet conversions to the BTH pancakes on my B29 and T6 so that they now produce some 3 to 4 amps. At the same time I also converted the cut out relays to diodes as I guess that the cut out itself consumes about 1 to 1.5 amp.
I can upload more informations if you like.
However LED bulps in the rear lamp and in pos. head lamp only consumes about 0,1 amp, that is a not so good dynamo may also be useable.
hoejmark

Offline cycarmark

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Re: B29 Finished
« Reply #9 on: Yesterday at 01:21 »
The front tappet cover is a mirror image of the rear.  The machine shop that made mine did the 3D model of them, and maybe they would let me have the model, I will ask.  With that you could take it to a CNC shop and I'll bet they could make one or a pair.  I do not have the machining skills or equipment to do such nice work.  My 1935 Craftsman lathe is pretty good for spacers and shafts, but not much else. 

The magneto rebuilder did exactly that, he converted the old magnets to more modern rare earth magnets and it works great.  I had thought about having the same done on the generator.  I would appreciate it if you could upload more information on this.

Offline Chris

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Re: B29 Finished
« Reply #10 on: Yesterday at 11:17 »
Hi Hoejmark
I would very much like to know what modifications you made to the magnet in the pancake dynamo. I would be grateful if you could detail these.
Chris.

Offline hoejmark

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Re: B29 Finished
« Reply #11 on: Today at 13:54 »
Hi
Some years ago I converted my T6 pancake to a modern AC alternator, that should give 70 w. It produced plenty of power, but it had to work loose often due to vibrations. I feared that the vibrations should provoke damages to the timing mechanism so I skipped the system again, and had to search for another solution.
I learned from a friend how to replace a weak pancake magnets by more modern super magnets, that can be hidden behind the cover, and it works well. I have done this conversion to my B29 and the T6.
I use four Neodym block magnet, size 20x20x10 mm with the magnetic field perpendicular to flat areas, and when I place the North poles nearest to the two fastening screws, the dynamo produce negative earth (otherwise it produce positive earth). Due to the position of the fastening screws, the four magnets can not be placed at right angles to each others, but no matter it produces well anyway.
In various books i have seen, that the pancake typically produce 3 to 4 amps at app. 3000 RPM, and my hope was to reach that. As you can see from the test setup I had the pancake to give 4,15 amp at 6,21 V at a little below 3000 RPM. I also had it to produce 4,2 amps at 6,4 V and even more than that, but as I am not an expert on how heavy load the solderings, commutator and brushes can handle, I did place a piece of 1 mm alu sheet under each magnet to reduce magnetic flux. The figures I gave are with these alu underlayers. I have glued the magnets and underlayer to the steel areas in the pancake body with Araldite, but I have recently read that UHU MAX REPAIR glue should be the best. By the way, I used a handdrill that could run up to 3000 RPM in the test setup.
Be aware of that these magnets are very strong and you probably will end up with several carpenters louse (translated from danish) on your fingers, and when in position and the cover in place, it easily holds an 8 inch universal spanner.
In place of the cut-off relay, that itself steal 1 amp. or more, I use a diode. Those I have are well beyond what is needed (200 V / 25 A), but that was what the retired car electrian had in stock, an I got a handful very cheap
I also attach a copy of a wiring diagram from another thread in this forum, I have omitted the zener diode to regulate voltage to the battery, as I fear, that the dynamo then will produce max. power constantly to the frame when battery is full. Instead i have fittet a toggler switch in the power line from the daynamo so that I can switch of the load when I can hear when activating the horn, that the battery is full. But as I am no expert either in what happens inside the dynamo when running without load, I should be glad to hear comments on this.
I attach some photos
hoejmark


Offline hoejmark

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Re: B29 Finished
« Reply #12 on: Today at 14:00 »
Hi again
The wiring diagram I refer to is the attached word DOCX document in the bottom of the photos.

I have it from this topic:
https://www.douglasmotorcycles.net/index.php?topic=5637.msg20431#msg20431

hoejmark

Offline hoejmark

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Re: B29 Finished
« Reply #13 on: Today at 14:07 »
cycarmark

 "The magneto rebuilder did exactly that, he converted the old magnets to more modern rare earth magnets and it works great."

Have you more informations?

hoejmark

 

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