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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
New Gearbox: Help Needed
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<blockquote data-quote="Monkeypants" data-source="post: 105755" data-attributes="member: 2708"><p>John McDougall played with the cam plate on the standard box.</p><p>He copied the general shape of the Norton AMC camplate. The AMC box is well known for slick shifting</p><p>This camplate change made the 4 spd Vincent gearbox shift like a Norton.</p><p>So it would appear that it's not the heavy gears that slow the shifting, as is sometimes suggested.</p><p>He was considering producing small lots of the modified camplate, but never got around to it.</p><p>One thing the 4 speed Vincent box has that a 5 speed Quaife doesn't is a 1.19 ratio (3rd) , a single gear that pulls hard from 60mph to up to 100 mph without over revving. It's an excellent ratio for hills, two up. You can run along at 70 or even 80mph two up on an 8 percent grade and have the engine right in the sweet spot , not overly busy with revs but producing lots of grunt.</p><p>This is 3800 rpm at 70, 4300 at 80mph.</p><p></p><p>Glen</p></blockquote><p></p>
[QUOTE="Monkeypants, post: 105755, member: 2708"] John McDougall played with the cam plate on the standard box. He copied the general shape of the Norton AMC camplate. The AMC box is well known for slick shifting This camplate change made the 4 spd Vincent gearbox shift like a Norton. So it would appear that it's not the heavy gears that slow the shifting, as is sometimes suggested. He was considering producing small lots of the modified camplate, but never got around to it. One thing the 4 speed Vincent box has that a 5 speed Quaife doesn't is a 1.19 ratio (3rd) , a single gear that pulls hard from 60mph to up to 100 mph without over revving. It's an excellent ratio for hills, two up. You can run along at 70 or even 80mph two up on an 8 percent grade and have the engine right in the sweet spot , not overly busy with revs but producing lots of grunt. This is 3800 rpm at 70, 4300 at 80mph. Glen [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
New Gearbox: Help Needed
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