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General Minitrail Talk
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Compression question, yet another...
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<blockquote data-quote="69ST" data-source="post: 174310" data-attributes="member: 5"><p>Okay, now that I'm no longer using wood-burning interweb access...</p><p></p><p> Stock sprocket combos:</p><ul> <li data-xf-list-type="ul">15/38 = 2.533</li> <li data-xf-list-type="ul">15/35 = 2.333</li> <li data-xf-list-type="ul">14/44 = 3.14</li> <li data-xf-list-type="ul">15/45 - 3.00</li> </ul><p>Primary gearing:</p><ul> <li data-xf-list-type="ul">18/67 = 3.72</li> <li data-xf-list-type="ul">17/69 = 4.05</li> </ul><p>Top gear ratios:</p><ul> <li data-xf-list-type="ul">1.19</li> <li data-xf-list-type="ul">1.04</li> </ul><p>Cutting to the chase, stock gearing (crank-to-wheel) was 11.21 for the K0, 11.24 for K1-later...a difference of 0.3%. The 4-speed motors make the same torque, thus need the same crank-to-wheel gearing, within ~3%. The difference between 1.04 & 1.19 is ~14% and that's just for the top gear alone. A little basic math, once you know what your primary ratio is, will tell the story, with precision. I just don't see a 72cc tune being able to pull ~9.6:1 gearing effectively, under typical riding conditions.</p></blockquote><p></p>
[QUOTE="69ST, post: 174310, member: 5"] Okay, now that I'm no longer using wood-burning interweb access... Stock sprocket combos: [LIST] [*]15/38 = 2.533 [*]15/35 = 2.333 [*]14/44 = 3.14 [*]15/45 - 3.00 [/LIST] Primary gearing: [LIST] [*]18/67 = 3.72 [*]17/69 = 4.05 [/LIST] Top gear ratios: [LIST] [*]1.19 [*]1.04 [/LIST] Cutting to the chase, stock gearing (crank-to-wheel) was 11.21 for the K0, 11.24 for K1-later...a difference of 0.3%. The 4-speed motors make the same torque, thus need the same crank-to-wheel gearing, within ~3%. The difference between 1.04 & 1.19 is ~14% and that's just for the top gear alone. A little basic math, once you know what your primary ratio is, will tell the story, with precision. I just don't see a 72cc tune being able to pull ~9.6:1 gearing effectively, under typical riding conditions. [/QUOTE]
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Compression question, yet another...
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