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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Valve Springs
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<blockquote data-quote="davidd" data-source="post: 113734" data-attributes="member: 1177"><p>I have been on hold with the project for several years. I have tried to get it going again, but I have not been able to find the time.</p><p></p><p>I am at the point that I have to have valves made. Unfortunately, there are enough small mods to the valve that it means making a new one. I am reasonably certain that G&S will knock them out, but I have to settle on a final valve design. This means prototyping a valve, which really needs to be done by me. That is the hold up.</p><p>[ATTACH=full]30705[/ATTACH]</p><p>Above is a stock valve and the spring height is not tall enough to reach the proper installed height.</p><p>[ATTACH=full]30706[/ATTACH]</p><p>For racing there is a huge difference in two springs, beehive on left and stock on right. </p><p></p><p>One of the changes is a different lock system to rid the system of the circlip, which has been a weak link in the system. </p><p></p><p>If you are just running on the street I would consider Mike Hawthorne's beehive conversion. </p><p>[ATTACH=full]30707[/ATTACH]</p><p>The photo shows a stock Vincent retainer and locks. It looks like Mike makes the retainer from steel. He mentions the other GS locks being available.</p><p></p><p>These springs are quite inexpensive because they make thousands of them for the Ford 32 valve 4.6 litre high performance engine. I paid $12 for mine. The titanium retainer is more at $15. Ultimately, the problem I have is that the stock valve has trouble with lifts approaching 0.500". The button on the valve shoulder hits the top of the valve guide. This means making a valve with a higher shoulder. Greg Brillus had to do this on his twin racer. The spring will definitely move 0.500", but the valve is not really designed to do 0.500".</p><p></p><p>David</p></blockquote><p></p>
[QUOTE="davidd, post: 113734, member: 1177"] I have been on hold with the project for several years. I have tried to get it going again, but I have not been able to find the time. I am at the point that I have to have valves made. Unfortunately, there are enough small mods to the valve that it means making a new one. I am reasonably certain that G&S will knock them out, but I have to settle on a final valve design. This means prototyping a valve, which really needs to be done by me. That is the hold up. [ATTACH type="full"]30705[/ATTACH] Above is a stock valve and the spring height is not tall enough to reach the proper installed height. [ATTACH type="full"]30706[/ATTACH] For racing there is a huge difference in two springs, beehive on left and stock on right. One of the changes is a different lock system to rid the system of the circlip, which has been a weak link in the system. If you are just running on the street I would consider Mike Hawthorne's beehive conversion. [ATTACH type="full"]30707[/ATTACH] The photo shows a stock Vincent retainer and locks. It looks like Mike makes the retainer from steel. He mentions the other GS locks being available. These springs are quite inexpensive because they make thousands of them for the Ford 32 valve 4.6 litre high performance engine. I paid $12 for mine. The titanium retainer is more at $15. Ultimately, the problem I have is that the stock valve has trouble with lifts approaching 0.500". The button on the valve shoulder hits the top of the valve guide. This means making a valve with a higher shoulder. Greg Brillus had to do this on his twin racer. The spring will definitely move 0.500", but the valve is not really designed to do 0.500". David [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Valve Springs
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