Author Topic: LED Info & Electrickery  (Read 1036 times)

Offline RoyC

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Re: LED Info & Electrickery
« Reply #30 on: 20.12. 2019 16:37 »
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Looking at Dynamo Regulators information it seems 38 mph is about as good as I can expect.
also i think the srm belt kits have a larger diameter pully on the dynamo end than the DVR belt kits, so srm's spin more slowly / need higher engine revs for volts. I got the srm kit before I learned this. so Roger you and I need to ride a bit faster!


This is my DVR kit if you want to compare.

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Online RDfella

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Re: LED Info & Electrickery
« Reply #31 on: 20.12. 2019 16:51 »
That's a hefty belt to transmit a tenth of a horsepower. Would almost do for a primary. One I fitted on my special is only around half that size and still fine 20yrs and thousands of miles later.
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Offline RoyC

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Re: LED Info & Electrickery
« Reply #32 on: 20.12. 2019 18:14 »
That's a hefty belt to transmit a tenth of a horsepower. Would almost do for a primary.


Yet they do brake if the tension is set too tight.
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Online JulianS

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Re: LED Info & Electrickery
« Reply #33 on: 20.12. 2019 18:21 »
Roger- I fitted a new old stock armature and brushes and new production field coil around 6 years ago.

Engine slightly geared up with a 22 tooth front sprocket.
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Offline RogerSB

  • 1960 Golden Flash, Plymouth, Devon, England
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Re: LED Info & Electrickery
« Reply #34 on: 20.12. 2019 21:53 »
Thanks Julian & Roy. Here's my SRM belt. Some time ago I remember deciding that if ever I needed to change it I'd get Mike Hutchings version next. I can't remember why exactly.
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Offline philwhitelaw

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Re: LED Info & Electrickery
« Reply #35 on: 24.12. 2019 13:51 »
Hi Gents,
            I have recently fitted out my 61 GF with all led lights from Paul Goff.  The ammetre barely moves as there is very little load on the dynamo and the light spread from the new style 12v BPF headlight is pretty good (I am a bit wary about riding too close behind saloon cars now as I can see the interior of the car lit up!!)  A bit on the pricey side but at least I know I can be seen even on the sunniest of days now.
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Offline RoyC

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Re: LED Info & Electrickery
« Reply #36 on: 24.12. 2019 15:55 »
Thanks Julian & Roy. Here's my SRM belt. Some time ago I remember deciding that if ever I needed to change it I'd get Mike Hutchings version next. I can't remember why exactly.

Higher gearing and a wider belt maybe.
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Online JulianS

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Re: LED Info & Electrickery
« Reply #37 on: 24.12. 2019 16:23 »
Roger - reading the DVR information the 38 mph given to balance is for a load of 84 watts - 45 watt headlamp and coil ignition.
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Offline RogerSB

  • 1960 Golden Flash, Plymouth, Devon, England
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Re: LED Info & Electrickery
« Reply #38 on: 24.12. 2019 17:23 »
Higher gearing and a wider belt maybe.
Your right Roy, I remember now, my belt is an SRM one and so it only increases the dynamo speed by 10% and as Mike said in reply 28 it takes higher revs to match the 20% from Dynamo Regulators.

Roger - reading the DVR information the 38 mph given to balance is for a load of 84 watts - 45 watt headlamp and coil ignition.
Also thanks for pointing that out Julian, I know the E3L is capable of delivering 60W (in good condition) and I wondered where the 84W came from.
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Offline mikeb

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Re: LED Info & Electrickery
« Reply #39 on: 24.12. 2019 20:20 »
the other thing about the srm one i bought was no threads into it to pull it off. being light alloy i'm not sure how i'll ever get it off without bending it
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Online bsa-bill

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Re: LED Info & Electrickery
« Reply #40 on: 24.12. 2019 20:42 »
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being light alloy i'm not sure how i'll ever get it off without bending it

Had to remove mine once, the thing with a taper is it takes little movement to get loose, I have an L shaped tool (it's a beekeepers hive tool), it's slim and can be inserted behind the pulley to give a gently force outwards, then a tap with a plastic hammer was enough to spring the pulley off, no harm done.
Pic attached ----  these tools are not expensive and you'll find a multitude of use for it
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All the best - Bill
1961 Flash - stock, reliable, steady, fantastic for shopping
1959 Rocket Gold Flash - blinged and tarted up  would have seizure if taken to  Tesco