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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
poor quality repop silencers
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<blockquote data-quote="macvette" data-source="post: 109868" data-attributes="member: 262"><p>This piece of advice intrigued me so I dug out the riders handbook because I remembered it quotes max safe speeds in the gears. For a Rapide with standard 46 rear sprocket at 100mph in top gear, it quotes 4600 rpm. Max safe speed in 3rd is quoted as 96 mph. 100mph in 3rd with standard 46t rear equates to approx 7500 rpm so "well into 3 figures in 3rd" seems excessive for a standard Rapide. I've not seen a hp/ torque curve for a Vincent but I'm pretty sure that at those revs, peak torque will have come and gone. Torque is what give acceleration so hanging on excessively to intermediate gears is counter productive.</p><p>Having changed to Spares co silencer and warmed her up, I gritted my teeth and hung onto 3rd a couple of times. It wasn't scientific but to me acceleration was falling off around 80 to 85 mph and I felt I was abusing the motor. I haven't done it since so now If I'm in a hurry, I change up to top at 70 when acceleration acceleration in top is strong. If pottering I change up at 60.</p></blockquote><p></p>
[QUOTE="macvette, post: 109868, member: 262"] This piece of advice intrigued me so I dug out the riders handbook because I remembered it quotes max safe speeds in the gears. For a Rapide with standard 46 rear sprocket at 100mph in top gear, it quotes 4600 rpm. Max safe speed in 3rd is quoted as 96 mph. 100mph in 3rd with standard 46t rear equates to approx 7500 rpm so "well into 3 figures in 3rd" seems excessive for a standard Rapide. I've not seen a hp/ torque curve for a Vincent but I'm pretty sure that at those revs, peak torque will have come and gone. Torque is what give acceleration so hanging on excessively to intermediate gears is counter productive. Having changed to Spares co silencer and warmed her up, I gritted my teeth and hung onto 3rd a couple of times. It wasn't scientific but to me acceleration was falling off around 80 to 85 mph and I felt I was abusing the motor. I haven't done it since so now If I'm in a hurry, I change up to top at 70 when acceleration acceleration in top is strong. If pottering I change up at 60. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
poor quality repop silencers
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