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View Full Version : Jack shaft ratios?

vwbuggyhead
11-04-2009, 05:35 PM
Can someone tell me how to calculate the jack shaft sprocket sizes? got a baja motorsports frame with a 19" rear tire, 54 tooth rear sprocket, 10 tooth clutch on a 6.5 Tecumseh OHV. This is a bare frame project I am building. Building a crawler, not wanting a speed demon.
1992suburban
11-04-2009, 05:38 PM
take the ratios and multiply them..

10/40 and a 15/30 would be 8:1 ratio
1992suburban
11-04-2009, 05:39 PM
http://www.compgoparts.com/TechnicalResources/JackshaftRatioCalculator.asp
1992suburban
11-04-2009, 05:41 PM
That deserves a THANK YOU LOL
vwbuggyhead
11-04-2009, 06:07 PM
Thanks for the link. it gives me somthing to work with. As for go fast! Hows a 1974 VW bug with a Subaru Legacy engine grab ya!
1992suburban
11-04-2009, 06:28 PM
NOT SO MUCH

VW bugs are fine as is. all 54 hp LOL
vwbuggyhead
11-05-2009, 04:48 PM
Yea, i've had about a dozen over the years. 68 and up 1600cc are rated at 60hp. With stock carb they make great buggys. But I saw a conversion at Daytona bug fest last year and had to give it a try. still in the building stage at this point. hope to have it done by late spring...
1992suburban
11-05-2009, 08:33 PM
was lookin @ a 69 with an autostick.. but I past on it