12 volts from a 6volt dynamo

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Keith.owen
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Re: 12 volts from a 6volt dynamo

Postby Keith.owen » Fri Nov 15, 2013 2:20 pm

Hi,
I'm having some disturbing thoughts about all of this..........

Your 720 Watt alternator if 100% efficient and delivering full load will require about 0.98 Horsepower from the engine.

An Alton at 300 Watt is going to be about half of this. Question?

How well does the combination of flimsy bicycle chain, taper joint, slipping clutch and fibre gear found in your typical Ariel single stand up to it?

On the BMW the rotor is on the end of the crankshaft isn't it?

:mrgreen:
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Re: 12 volts from a 6volt dynamo

Postby david.anderson » Sat Nov 16, 2013 7:01 am

Keith
Bennets alternator would have been in Cheval about 3 years ago but there is a copy in the knowledgebase under “square 4 alternator”. This is the link. http://www.arielownersmcc.co.uk/members ... m_759.html
It is based on a 300w Kawasaki alternator.
The Alton (vh)is 150w. I have not had any problems with a slipping clutch on the fibre wheel and the bike is regularly thrashed.
David

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Bob.Murphy
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Re: 12 volts from a 6volt dynamo

Postby Bob.Murphy » Sat Nov 16, 2013 12:17 pm

Keith.owen wrote:Hi,

I'm having some disturbing thoughts about all of this.......... On the BMW the rotor is on the end of the crankshaft isn't it?

Keith


On the 1150 the alternator is belt-driven. On the earlier 450/650/700/800/900/1,000cc "Airhead" motors they were on the end of the crankshaft. I also have a 1988 R100 GS 'Bumblebee' with this set-up. These are only 250 Watts though (400 Watt conversions available).

The latest 1200 GS with watercooling has the alternator at the back, gear-driven.

My 'VH' doesn't appear to have a fibre gear, it seems to be all-steel so I hadn't seen this as a problem (providing I remember to fully-retard the ignition before lunging at the kickstart) :? .

Bob.
My avatar shows the late Len Rich in 1970 with the bike I now have - a 1958 Ariel VH

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Postby john.mitchell » Sat Nov 16, 2013 4:54 pm

Keith, April 2009 the article was in Cheval. I think it attached here but cannot see it yest,
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Alternator.doc
(793.99 KiB) Downloaded 196 times
John Mitchell
Ex Editor Cheval de Fer

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Re:

Postby Bob.Murphy » Sun Nov 17, 2013 12:19 pm

john.mitchell wrote:Keith, April 2009 the article was in Cheval. I think it attached here but cannot see it yet,


It works 8-) .

Save it as a Word document then open it.

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Re: 12 volts from a 6volt dynamo

Postby Keith.owen » Tue Nov 19, 2013 2:13 pm

Thanks John and Bob!

Interesting reading, but not suitable for my VH.

Keith
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Postby marcus whatling » Fri Nov 22, 2013 11:50 pm

Thank You for all the replies , The modern voltage control unit I have just got is for either 6 Volt or 12 v Volt . I am running motorway gearing to keep the revs down I might be better of staying with 6 Volt .


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