need some gearing help

[trinik7597]

need some gearing help for 100 ft drag :thumbsup: have a 13 tooth 2 disc reaper clutch with stall set at about 3500 rpm and a 66 tooth split rear sprocket with jackshaft in between trying to figure out how to set it up to jump out of the hole and pull the whole way hitting max at the line . any input or opinion on this would be greatly appreciated :shrug:

 

[trinik7597]

thanks a lot guys :laugh::laugh: how about this 13 tooth clutch 66 rear sprocket jack shaft in between how do i get my ratio to about 6.5 0r 7 to 1 :shrug::thumbsup:

 

[Havasu Dave]

thanks a lot guys :laugh::laugh: how about this 13 tooth clutch 66 rear sprocket jack shaft in between how do i get my ratio to about 6.5 0r 7 to 1 :shrug::thumbsup:

JS in: 17t JS out: 13t equals 6.6:1

JS in: 15t JS out: 12t equals 6.3:1

From the Pardue Bro's spreadsheet. :thumbsup:

 

[trinik7597]

JS in: 17t JS out: 13t equals 6.6:1

JS in: 15t JS out: 12t equals 6.3:1

From the Pardue Bro's spreadsheet. :thumbsup:

thank you very much Dave :thumbsup::thumbsup:

 

[Havasu Dave]

thank you very much Dave :thumbsup::thumbsup:

No problem. I downloaded InventorPardue's spreadsheet for jack shafts awhile back. Here is a link to some spreadsheets he worked up. Not sure if the .xls files are still there.

http://www.oldminibikes.com/forum/t...-speed-calculators-post921525.html#post921525

 

[vwfan79]

Here's the formula for figuring out jackshaft gear ratio (js in÷clutch)×(rear gear÷js out)

I would start around 7 and go from there being that it's only 100'. For the 1/8 I'll be started with 5.5:1 and going from there. Make sure your stall is set in your power band rpm range.

 

[trinik7597]

Here's the formula for figuring out jackshaft gear ratio (js in÷clutch)×(rear gear÷js out)

I would start around 7 and go from there being that it's only 100'. For the 1/8 I'll be started with 5.5:1 and going from there. Make sure your stall is set in your power band rpm range.

thanks nick :thumbsup: