Author Topic: Considering dynamo belt conversion  (Read 1598 times)

Offline OldSwede

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Re: Considering dynamo belt conversion
« Reply #15 on: 26.05. 2018 18:04 »
Hello again Greybeard. I installed a SRM belt and a new oil pump a couple of years ago. Works nice. Yes it revs 10% more than the standard so it will cause more wear. For me that is no problem. I use my A7 for meetings and rallies not for everyday driving.

Offline RoyC

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Re: Considering dynamo belt conversion
« Reply #16 on: 26.05. 2018 18:07 »
I have the DVR2, which has been trouble free so I'm inclined to go for that set.

I have also ordered one of these belt drives with a spare belt.

http://dynamoregulators.com/drive-belt-kit.php
My bike is a 1958 A7SS
Stafford UK

Online Greybeard

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Re: Considering dynamo belt conversion
« Reply #17 on: 26.05. 2018 18:10 »
Hello again Greybeard. I installed a SRM belt and a new oil pump a couple of years ago. Works nice. Yes it revs 10% more than the standard so it will cause more wear. For me that is no problem. I use my A7 for meetings and rallies not for everyday driving.
Very pretty! Shame to cover it all up!

Offline paulmbsa

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Re: Considering dynamo belt conversion
« Reply #18 on: 26.05. 2018 23:23 »
there shit, i hammer my dynamo always use the heated grips and often have lights on as well, V belts wear out quickly, thoothed belts not much better gone back to chain all good,

Offline Peter in Aus

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Re: Considering dynamo belt conversion
« Reply #19 on: 27.05. 2018 02:27 »
there shit, i hammer my dynamo always use the heated grips and often have lights on as well, V belts wear out quickly, thoothed belts not much better gone back to chain all good,
Me to, tried V belts B**** useless went back to chain, haven't tried tooth belts thou.
Peter

Busselton West Australia
49 A7 longstroke
58 A10  SA

Offline muskrat

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Re: Considering dynamo belt conversion
« Reply #20 on: 27.05. 2018 03:40 »
G'day paulmbsa.
All the more reason to go up in the drive. Set up right the belt is far more superior.
Cheers
'51 A7 plunger, '57 A7SS now A10CR, '76 XT500, '77 AG175 '83 CB1100F, '81 CB900F project.
Australia
Muskys Plunger A7

Online RichardL

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Re: Considering dynamo belt conversion
« Reply #21 on: 27.05. 2018 04:04 »
My SRM belt went bad after not too long. Honestly, don't know if it was my fault or the belt's. In any case, bought two replacements from a belt supply house and no problems since. My spare lays in waiting, none the less.

Richard L.
Plan on signing up for the world-wide 2017 DISTINGUISHED GENTLEMAN'S RIDE on September 30, 2018. Watch website at https://www.gentlemansride.com for details.

Offline scotty

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Re: Considering dynamo belt conversion
« Reply #22 on: 27.05. 2018 05:47 »
I have an SRM dynamo drive toothed belt conversion

Seems ok to me but I never gave the chain drive a chance choosing to replace the chain on what was a basket case re build.

I don't put huge miles on my A10 but have not had issues with the toothed belt drive on the dynamo

Scotty
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Offline muskrat

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Re: Considering dynamo belt conversion
« Reply #23 on: 27.05. 2018 06:25 »
Since I adjusted my thinking on the belt tension I've had no problems. I had chewed up a few belts before this.
I was working on my plunger this morning and checked the belt. With very little pressure on the bottom run it was able to reach the screw boss (or where it used to be as I've ground it down flush, it was badly chain eaten) .
Cheers
'51 A7 plunger, '57 A7SS now A10CR, '76 XT500, '77 AG175 '83 CB1100F, '81 CB900F project.
Australia
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Online Black Sheep

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Re: Considering dynamo belt conversion
« Reply #24 on: 27.05. 2018 06:54 »
Haven't had any problems with the original chain setup (46 years and counting). The large sprocket is held by 6 shear rivets so that should a chain fail, the rivets shear (it's in the name) preventing further damage. This happened to me after an ill-advised 12 volt conversion caused the commutator segments to let go, seizing the dynamo and breaking the chain.
2 twins, 2 singles, lots of sheep

Offline muskrat

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Re: Considering dynamo belt conversion
« Reply #25 on: 27.05. 2018 09:28 »
I'd imagine if the same happened with a belt it would just eat a few teeth  *dunno*.
Cheers
'51 A7 plunger, '57 A7SS now A10CR, '76 XT500, '77 AG175 '83 CB1100F, '81 CB900F project.
Australia
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Offline Dynamo Regulators Mike

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Re: Considering dynamo belt conversion
« Reply #26 on: 28.05. 2018 10:21 »
I just thought I would add my thoughts on a couple of the issues raised.

Firstly does the dynamo regulators belt drive kit with its 20% up-gearing wear the dynamo out more rapidly?
Well, the armature spins faster, but for a given electrical load the the mechanical input power to the drive is much the same (although the overall power conversion efficiency may well be improved). The field current in the dynamo will be lower, which also leads to lower armature heat dissipation. Friction loss in the belt may be a little greater as well as the windage (air drag in the dynamo but that is a small effect I believe). Our dynamos can well withstand the extra speeds encountered, the dynamo to crank speed being the same as in a magdyno. I say no need to worry about increased wear in dynamo.

So is the belt drive quieter than the chain?
Not necessarily, but more than likely. If the chain drive is not too worn and well adjusted and the chain has no tight spot all should run pretty quiet. But probably the great majority of all inner timing have grooves where the chain has rubbed. That is a noisy process! Many customers have been delighted with the enhanced quietness from the timing side in practice. Of course those with loud exhausts will have trouble perceiving any difference.

Many thanks for all those who have purchased our dynamo drive kit over the years, and more recently. Back to a normal working day tomorrow where the orders will be processed for same day posting. Hope you avoid the thunder storms in UK if out and about later.

Mike Hutchings
A10, B50, T800; 1,2,3 (& DVR2)
Director, DRL www.dynamoregulators.com

Offline RoyC

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Re: Considering dynamo belt conversion
« Reply #27 on: 30.05. 2018 18:19 »
My DRL belt drive arrived today, when fitting the small pulley, washer and supplied nut, the nut sticks out past the pulley  7/16", is this correct ?
My bike is a 1958 A7SS
Stafford UK

Offline morris

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Re: Considering dynamo belt conversion
« Reply #28 on: 30.05. 2018 18:49 »
Do the pulleys line up?
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Offline RoyC

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Re: Considering dynamo belt conversion
« Reply #29 on: 30.05. 2018 18:59 »
Do the pulleys line up?
I have only fitted it onto the new dynamo at the moment.
Dynamo not fitted to the bike yet.
My bike is a 1958 A7SS
Stafford UK