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General Chat (Vincent Related)
5 Speed Gearbox
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<blockquote data-quote="Tom Gaynor" data-source="post: 749" data-attributes="member: 4034"><p><strong>Altered gearing</strong></p><p></p><p>That's a HUGE increase in gearing. I race the Manx with 19 and 20 tooth gearbox sprockets (Newby belt drive). 19 is for Cadwell and East Fortune, 20 is for Chimay and the Ulster (both with long 130 mph+ sections). Of course you must try it out first, but the problem with a four-speed box is that, say you were getting 25, 50, 75 and 100 at peak revs, with higher gearing there is an even BIGGER gap between ratios, so to "knock it back one" without locking the back wheel and knotting the valves, you would have to drop the speed from (say) 120 to 90. Generally the concensus on five and particularly six-speed boxes is that "they have a gear for every corner", and while no doubt Lea Gourlay would perform well with a three speed box in a manx, five and six-speed clusters have virtually taken over.</p><p>The only circuit I can think of that a four speed works well on is Knockhill (there are doubtless others) where series of corners can be taken at similar speed in the same gear, and going up and down the box is largely confined to straight line stuff.</p><p>As you can probably discern, I'm a complete convert. Everything about it is better: the ratios, the closeness of the ratios, the ease of changing - and the reliability thus far, fingers crossed........</p></blockquote><p></p>
[QUOTE="Tom Gaynor, post: 749, member: 4034"] [b]Altered gearing[/b] That's a HUGE increase in gearing. I race the Manx with 19 and 20 tooth gearbox sprockets (Newby belt drive). 19 is for Cadwell and East Fortune, 20 is for Chimay and the Ulster (both with long 130 mph+ sections). Of course you must try it out first, but the problem with a four-speed box is that, say you were getting 25, 50, 75 and 100 at peak revs, with higher gearing there is an even BIGGER gap between ratios, so to "knock it back one" without locking the back wheel and knotting the valves, you would have to drop the speed from (say) 120 to 90. Generally the concensus on five and particularly six-speed boxes is that "they have a gear for every corner", and while no doubt Lea Gourlay would perform well with a three speed box in a manx, five and six-speed clusters have virtually taken over. The only circuit I can think of that a four speed works well on is Knockhill (there are doubtless others) where series of corners can be taken at similar speed in the same gear, and going up and down the box is largely confined to straight line stuff. As you can probably discern, I'm a complete convert. Everything about it is better: the ratios, the closeness of the ratios, the ease of changing - and the reliability thus far, fingers crossed........ [/QUOTE]
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5 Speed Gearbox
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