jackshaft gear ratio question

#1
I have searched the forum with no luck so far. im running a predator 212 hemi head with boxstock bored carb mod 1 cam 18# springs and i bought a jackshaft but was wonder ing about the ratio i have a 12 tooth clutch and 54 rear sprocket the jack shaft is 13 and 15. One way i get a ratio close to 5.2 to 1 and the other way i get 3.1 to 1. Which would work best i want the speed but dont know if i would lose too much torque. Suggestions or advice appreciated greatly
 

capguncowboy

Well-Known Member
#2
at 3.5:1, you'll have a hard time pulling out, and you won't have a lot of acceleration for the first 15-20mph

Running it at 6:1 seems to be the sweet spot. It's a good balance between acceleration and top speed
 
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