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]

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?

Only problem you might have, is the front sprocket wearing out quickly, smaller they are faster they wear.

Al.

I think i can get a 14 if not i'll just make one at work. Fingers crossed that it works.

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]

eh? sorry but i dont understand?

Feel like an idiot.

quote:

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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]

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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]

Belt drive it is then

quote:

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Originally posted by ReMan
Belt drive it is then

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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

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]

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

quote:

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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]

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ive left the haynes manual at work. i'll bring it home tomorrow and post up the gear ratios.

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)

Whats its like with the 14:40? acceleration/top speed on one engine?

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.

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]

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]

all the gearbox info is in the above pic. Where else could it be?

Its the bottom one in the final drive section zx1000 B

Primary Reduction Ratio 1.637 (95/58)

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.

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

There will be about 2inches gap with a 14:42 sprocket setup. space is taken up mainly by the exhaust down pipes.

quote:

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Originally posted by CraigJ
There will be about 2inches gap with a 14:42 sprocket setup. space is taken up mainly by the exhaust down pipes.

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It should hopefully turn out ok now. will know in about 2 weeks.

would you really need to go down as far as a 39 for the back? could you not maybe try 15/42

Also speak to Talon engineering for bespoke sprockets. They supply all mine for my race bike and have a very quick turn around.

im going for a 14-42 setup. im a laser profiler so i can do them myself lol.

quote:

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Originally posted by CraigJ
im going for a 14-42 setup. im a laser profiler so i can do them myself lol.

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