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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Gearing on a Twin
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<blockquote data-quote="davidd" data-source="post: 87780" data-attributes="member: 1177"><p>[ATTACH=full]17738[/ATTACH] </p><p>If you are using Windows you can always do a screen capture and one way is to use their snipping tool. You put what you want in a box and it is saved as a .GIF in your picture file and the Forum likes GIF's. I had to cut the top of this because it would not all fit on my computer screen, but it is the Excel program I use. I made this one for David Tompkin's who was racing at Barber recently.</p><p></p><p>David shifted at 5,500, on advice to the dyno guy, but after the race he was hungry for more speed. I suggested that he has to shift at 6000 if he wants more speed. The chart shows how important red line is to racing. I shift at 7000. If you compare the speeds at 6000 and 7000 there is a huge difference in speed. I suggested this gearing for 6000 because I like to gear for just around 100 mph on the straight. I would have selected a lower gearing, that is, 103-4 at 7000 for my own use as the fastest the racer was clocked was 105 mph at Daytona with a radar gun. But, when you realize that the difference a 1000 rpm can give you, anywhere between 6 and 16 mph more , it is hard to give that up.</p><p></p><p>David is running an AMC box right now. He is swapping it out this winter for a BAR box. So, the ratios are Norton. The primary drive ratio is Newby.</p><p></p><p>I have a few different templates and can do a 6 speed also. If anyone wants the Excel document PM your email to me.</p><p></p><p>David</p></blockquote><p></p>
[QUOTE="davidd, post: 87780, member: 1177"] [ATTACH=full]17738[/ATTACH] If you are using Windows you can always do a screen capture and one way is to use their snipping tool. You put what you want in a box and it is saved as a .GIF in your picture file and the Forum likes GIF's. I had to cut the top of this because it would not all fit on my computer screen, but it is the Excel program I use. I made this one for David Tompkin's who was racing at Barber recently. David shifted at 5,500, on advice to the dyno guy, but after the race he was hungry for more speed. I suggested that he has to shift at 6000 if he wants more speed. The chart shows how important red line is to racing. I shift at 7000. If you compare the speeds at 6000 and 7000 there is a huge difference in speed. I suggested this gearing for 6000 because I like to gear for just around 100 mph on the straight. I would have selected a lower gearing, that is, 103-4 at 7000 for my own use as the fastest the racer was clocked was 105 mph at Daytona with a radar gun. But, when you realize that the difference a 1000 rpm can give you, anywhere between 6 and 16 mph more , it is hard to give that up. David is running an AMC box right now. He is swapping it out this winter for a BAR box. So, the ratios are Norton. The primary drive ratio is Newby. I have a few different templates and can do a 6 speed also. If anyone wants the Excel document PM your email to me. David [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Gearing on a Twin
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