So I'm looking over my gearing spreadsheet trying to decide if I should drop one tooth in the back. And I'm looking at the formulas....haven't done a complete study of it...but a few quick numbers through the calculator and it appeared to me that if a person wanted a close ratio gearbox...and real short cut could be reducing the primary drive ratio.
Remember...the spread of gear ratios in the box as it relates to engine rpm is multiplied by the primary gear ratio...in my case 3.7:1.....so...if a person could reduce the primary drive ratio to say 3.2:1 then the "spread" between each gear in the box would be that much less....effectively producing a close ratio box with a taller first gear. Final drive sprockets could be changed to adjust for the same top end speed.
Since all the box ratios are multiplied by the primary ratio...it seems to me that it would work. For instance 4th and 5th gear would still be the same number ratio different...but their relationship to engine rpm would a smaller step do to reducing the multiplier of the primary ratio.
Anyone else put some thought into this?
JohnnyB
Remember...the spread of gear ratios in the box as it relates to engine rpm is multiplied by the primary gear ratio...in my case 3.7:1.....so...if a person could reduce the primary drive ratio to say 3.2:1 then the "spread" between each gear in the box would be that much less....effectively producing a close ratio box with a taller first gear. Final drive sprockets could be changed to adjust for the same top end speed.
Since all the box ratios are multiplied by the primary ratio...it seems to me that it would work. For instance 4th and 5th gear would still be the same number ratio different...but their relationship to engine rpm would a smaller step do to reducing the multiplier of the primary ratio.
Anyone else put some thought into this?
JohnnyB