CraigJ
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| posted on 14/5/07 at 05:29 PM |
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is this right? (Ratios now added)
sprocket ratio. on the bike it was 17 tooth on the front and 47 on the back standard. So if ive worked it out right thats 2.7647058:1
Due to limited space in my chassis i cant fit a 47 tooth rear so if i fit a 14 front and using the above ratio the rear should be a 39 tooth. Will
this work? I have to go smaller than 47 on the chain diff due to space and i need some room to tighten the chain.
Any advice welcome?
[Edited on 14/5/07 by CraigJ]
[Edited on 16/5/07 by CraigJ]
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ReMan
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| posted on 14/5/07 at 05:37 PM |
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Mainly right, but I suppose pedandicaly it's 0.362:1 on original, and 0.358:1 on your proposal
.Are you sure you can get a 14? there may be a physical limit how small they can go?
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Wadders
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| posted on 14/5/07 at 05:38 PM |
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Only problem you might have, is the front sprocket wearing out quickly, smaller they are faster they wear.
Al.
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CraigJ
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| posted on 14/5/07 at 05:47 PM |
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I think i can get a 14 if not i'll just make one at work. Fingers crossed that it works.
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CairB
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| posted on 14/5/07 at 05:48 PM |
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A polygonal effect occurs with chainwheels that results in a cyclic variation in chain velocity versus angular velocity which increases significantly
as the number of teeth reduces.
What this means is that at constant shaft speed the chain is being accelerated and decelerated as the chain effective radius changes which results in
vibration and extra loading in the chain.
The maximum chain speed and power transmitted need to be reduced accordingly.
See Chain Design Guide on page 10.
Also the smaller the number of teeth results in extra link articulation which increases the wear rate.
You could consider using multiple runs of smaller pitch chain to get the tooth count back up.
HTH
Cheers,
Colin
[Edited on 14/5/07 by CairB]
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CraigJ
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| posted on 14/5/07 at 05:57 PM |
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eh? sorry but i dont understand?
Feel like an idiot.
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ReMan
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| posted on 14/5/07 at 05:59 PM |
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quote:
Originally posted by CairB
A polygonal effect occurs with chainwheels that results in a cyclic variation in chain velocity versus angular velocity which increases significantly
as the number of teeth reduces.
What this means is that at constant shaft speed the chain is being accelerated and decelerated as the chain effective radius changes which results in
vibration and extra loading in the chain.
The maximum chain speed and power transmitted need to be reduced accordingly.
See Chain Design Guide on page 10.
Also the smaller the number of teeth results in extra link articulation which increases the wear rate.
You could consider using multiple runs of smaller pitch chain to get the tooth count back up.
HTH
Cheers,
Colin
[Edited on 14/5/07 by CairB]
Bloomin heck!!!
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JoelP
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| posted on 14/5/07 at 05:59 PM |
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he's basically saying that a sprocket is not really round, as the chain goes up and down over the teeth it has to slow down and speed up, hence
vibration and wear.
[Edited on 14/5/07 by JoelP]
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ReMan
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| posted on 14/5/07 at 05:59 PM |
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Belt drive it is then 
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ReMan
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| posted on 14/5/07 at 06:01 PM |
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quote:
Originally posted by ReMan
Belt drive it is then
Though realistcally, for how much use your "toy" will get, a bit more wear is probably a small price to pay for
FUN!
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CairB
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| posted on 14/5/07 at 06:07 PM |
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Sorry if I confused, but the link I posted will explain the phenomenon which you can decide whether or not its relevant for your build.
Just a thought though, is matching the bike ratio what you want to be doing as you probably have different sized wheels and required peak speed to the
bike?
Cheers,
Colin
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CraigJ
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| posted on 14/5/07 at 06:16 PM |
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No im not that fussed about matching the bikes ratio i just need a rough figure of what size rear sprocket to use as its been drawn up at work as a
program so it can be cut by laser so i need to know roughly what size to go for. Im going to do a few sizes so i can swap them about to get the
acceleration/top speed that i want but i just need a rough starting point. the wheels will be 13inh fitted with 185/60/13 i think so i want to end up
with a good mix of acceleration and cruising speed. dont wan to be maxed out in 6th at 80mph if you know what i mean.
[Edited on 14/5/07 by CraigJ]
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blue2cv
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| posted on 14/5/07 at 06:45 PM |
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how many links do you think your chain will have, according to muffet gears a 30 link chain lasts about 30 mins before it overheats
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ReMan
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| posted on 14/5/07 at 07:49 PM |
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quote:
Originally posted by CraigJ
No im not that fussed about matching the bikes ratio i just need a rough figure of what size rear sprocket to use as its been drawn up at work as a
program so it can be cut by laser so i need to know roughly what size to go for. Im going to do a few sizes so i can swap them about to get the
acceleration/top speed that i want but i just need a rough starting point. the wheels will be 13inh fitted with 185/60/13 i think so i want to end up
with a good mix of acceleration and cruising speed. dont wan to be maxed out in 6th at 80mph if you know what i mean.
[Edited on 14/5/07 by CraigJ]
I think you'll fin that theres not much difference in diameter of the 13" wheels above an dthe 17/18" from the bike, so you may just
need to adjust gearing down to a realistic top speed you want to hit
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CraigJ
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| posted on 14/5/07 at 08:14 PM |
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ive left the haynes manual at work. i'll bring it home tomorrow and post up the gear ratios.
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russbost
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| posted on 14/5/07 at 09:31 PM |
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if you can't find a 14 tooth sprocket I can supply one for under £20, I'm running 14:40 & haven't had any issues with chain
wear, but only do relatively low mileage (under 1000 pa)
I no longer run Furore Products or Furore Cars Ltd, but would still highly recommend them for Acewell dashes, projector headlights, dominator
headlights, indicators, mirrors etc, best prices in the UK! Take a look at http://www.furoreproducts.co.uk/ or find more parts on Ebay, user names
furoreltd & furoreproducts, discounts available for LCB users.
Don't forget Stainless Steel Braided brake hoses, made to your exact requirements in any of around 16 colours.
http://shop.ebay.co.uk/furoreproducts/m.html?_dmd=1&_ipg=50&_sop=12&_rdc=1
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NOTE:This user is registered as a LocostBuilders trader and may offer commercial services to other users
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CraigJ
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| posted on 15/5/07 at 05:36 PM |
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Whats its like with the 14:40? acceleration/top speed on one engine?
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CraigJ
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| posted on 16/5/07 at 01:16 PM |
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Gear ratios for the 88 zx10.
1st 2.800:1
2nd 2.000:1
3rd 1.590:1
4th 1.333:1
5th 1.153:1
6th 1.035:1
I will be running 185/60/13 tyres.
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CraigJ
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| posted on 16/5/07 at 06:19 PM |
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begining of redline is 11,000 on the clocks.
How do i find out the primary ratio do you mean the standard sprocket ratios. If so they are 2.647:1 (45/17 T) is this any help?
Thanks for helping with this by the way.
[Edited on 16/5/07 by CraigJ]
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CraigJ
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| posted on 16/5/07 at 06:37 PM |
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1st 2.800:1 (42/15 T)
2nd 2.000:1 (38/19 T)
3rd 1.590:1 (35/22 T)
4th 1.333:1 (32/24 T)
5th 1.153:1 (30/26 T)
6th 1.035:1 (29/28 T)
erm is this any help? theres nothing i can see that is listed as a primary ratio
[Edited on 16/5/07 by CraigJ]
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CraigJ
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| posted on 16/5/07 at 06:49 PM |
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all the gearbox info is in the above pic. Where else could it be?
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CraigJ
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| posted on 16/5/07 at 07:04 PM |
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Its the bottom one in the final drive section zx1000 B
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CraigJ
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| posted on 16/5/07 at 07:12 PM |
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Primary Reduction Ratio 1.637 (95/58)
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CraigJ
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| posted on 16/5/07 at 07:19 PM |
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How do you work these out would be nice to know lol.
think a 42-43 might be what i go for not sure a bigger sprocket will fit in the available space.
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Minicooper
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| posted on 17/5/07 at 10:14 AM |
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Hello Craig,
How close do you intend to run the sprockets, I think on the ZCars Hayabusa minis the gap is only just above two inches, is it as tight as that or
even tighter?
The ZX10 motors are big old lumps compared to the more modern 1000cc superbike engines which must 3 or 4 inches less deep
Cheers
David
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