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#Post#: 5880--------------------------------------------------
This is doing my head in!
DIR By: Adrian
Date: March 10, 2022, 8:43 am
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Help!
I think my brain is addled.
On the T/C I have a 10 tooth pinion.
This drives a 60 tooth sprocket on a layshaft.
Also on the layshaft is a second sprocket which drives the diff
on the rear axle
The diff has a 45 tooth sprocket fixed to it.
How many teeth do I need on the second layshaft sprocket to end
up with an overall ratio of 6.5:1
#Post#: 5882--------------------------------------------------
Re: This is doing my head in!
DIR By: Andy_B
Date: March 10, 2022, 9:10 am
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Do you really want us to answer the first bit ;D ;D ;D
#Post#: 5884--------------------------------------------------
Re: This is doing my head in!
DIR By: jim
Date: March 10, 2022, 11:01 am
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I'm thinking You will need a layshaft sprocket slightly smaller
than the diff one.
#Post#: 5885--------------------------------------------------
Re: This is doing my head in!
DIR By: Jimr1999
Date: March 10, 2022, 11:02 am
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41 or 42
#Post#: 5886--------------------------------------------------
Re: This is doing my head in!
DIR By: Jimr1999
Date: March 10, 2022, 11:05 am
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... By my maths, which is not infallible, a sprocket of 41.538
teeth would be an impossibility
;D
#Post#: 5888--------------------------------------------------
Re: This is doing my head in!
DIR By: GeoffM
Date: March 10, 2022, 11:21 am
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Well In think you need a 65 tooth sprocket on the diff.
10 driving 60 gives 6:1
60 driving 65 makes final 6.5:1 maybe? cheers, Geoff
#Post#: 5889--------------------------------------------------
Re: This is doing my head in!
DIR By: Jimr1999
Date: March 10, 2022, 11:30 am
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... To explain my logic.
You have a 6:1 ratio from TAV to jack shaft, a ratio we see as
standard on the Stevenson formula.
You require a ratio of 6.5:1
your ratio is 0.923 of the ratio you have. (6/6.5)
0.923 of 45 is somewhere between 41 and 42 (41.53)
#Post#: 5891--------------------------------------------------
Re: This is doing my head in!
DIR By: Mark Under
Date: March 10, 2022, 2:00 pm
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Jims Correct,
I worked mine out in the following way which may help.
10 tooth sprocket on the TAV
60 tooth sprocket on the layshaft
41 tooth sprocket on the other end of the layshaft
45 tooth sprocket on the diff.
10x41= 410
60x45 = 2700
2700/410.53 = 6.585
I have a similar set up but a 40 tooth sprocket on the layshaft.
#Post#: 5916--------------------------------------------------
Re: This is doing my head in!
DIR By: Adrian
Date: March 12, 2022, 5:45 am
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Thanks for the responses. I know what I am going to do now in
sprocket terms.
I have sort of figured out what I'm going to make. It will be a
skid unit of sorts which carries the engine and the layshaft and
this will be welded to the chassis.
Anyway, sort of sorted it........
Thanks again.
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