Siduna
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| posted on 22/4/14 at 03:38 PM |
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Chain lenght
Hi!
Is there anyone "out there" that can tell me the distance between the outgoing sprocket shaft centre and the rear sprocket centre on
Radicals and hopefully similar cars. Any thoughts and experiances are also appreciated!
Cheers
[Edited on 23/4/14 by Siduna]
Writing with a broken pencil is pointless
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Siduna
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| posted on 28/4/14 at 07:06 PM |
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quote:
Originally posted by Siduna
Hi!
Is there anyone "out there" that can tell me the distance between the outgoing sprocket shaft centre and the rear sprocket centre on
Radicals and hopefully similar cars. Any thoughts and experiances are also appreciated!
Cheers
[Edited on 23/4/14 by Siduna]
Anyone building/owning a chain driven BEC?
Writing with a broken pencil is pointless
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Sam_68
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| posted on 28/4/14 at 07:36 PM |
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quote:
Originally posted by Siduna
Is there anyone "out there" that can tell me the distance between the outgoing sprocket shaft centre and the rear sprocket centre on
Radicals ...
265mm or thereabouts on the Radical, I believe.
There's no real 'standard' dimension across similar cars, though.
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Siduna
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| posted on 28/4/14 at 07:42 PM |
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Thanks!
Highly appreciate your input. I understand that the Stohr cars have somewhat longer distance. Anyone who can confirm? I'm looking at having
approx 400mm, hoping that will increase chain life.
Writing with a broken pencil is pointless
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Sam_68
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| posted on 28/4/14 at 08:17 PM |
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Dunno about Stohrs; they're not exactly commonplace in the UK. You might try asking on the D Sports
Forum
IIRC, the usual recommendation is that centre distances should be between 30 and 50 times the chain pitch? Too short and the frequency of rotation of
individual links increases wear; too long and there is too much stretch, which must be compensated by tension, which causes more stretch... vicious
circle. Something like that, anyway. 
I'm sure if you Google 'drive chain design' or something similar, the manufacturer's websites will have all the relevant
equations for calculating optimum lengths, though.
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Siduna
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| posted on 29/4/14 at 08:08 PM |
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quote:
Originally posted by Sam_68
Dunno about Stohrs; they're not exactly commonplace in the UK. You might try asking on the D Sports
Forum
IIRC, the usual recommendation is that centre distances should be between 30 and 50 times the chain pitch? Too short and the frequency of rotation of
individual links increases wear; too long and there is too much stretch, which must be compensated by tension, which causes more stretch... vicious
circle. Something like that, anyway.
I'm sure if you Google 'drive chain design' or something similar, the manufacturer's websites will have all the relevant
equations for calculating optimum lengths, though.
530 chain has a pitch of 25,4x5/8= 15,875 mm (have an issue with Imperial dimensions). Hence the distance should be 476,25 mm - 793,75 mm. So aiming
at 400-450 mm isn't too far of the recommendations then.... Rather have a bit longer wheelbase that having issues with chain wear.
Thanks for you input! Well worth a shoot gun ride once the car is finished 
/J
Writing with a broken pencil is pointless
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