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General Chat (Vincent Related)
Valve Spring Reference
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<blockquote data-quote="davidd" data-source="post: 91152" data-attributes="member: 1177"><p>I think so. I shimmed my Gold Star springs for 110 lbs. opening pressure which should be well within that range. </p><p></p><p>When I selected a beehive spring replacement for the Gold Star springs on the racer I did not choose any of the springs listed by Bruce. I chose one that had 90 lbs. opening pressure. The tough part is selecting all the other pieces to work with the springs: retainer, locks, top valve guide and valve. It is relatively easy for a racer because the stock valve locks and valve would not necessarily be the first choice. If you have to custom make those two items, you might as well go to beehives. The reduction in mass of the beehive system is impressive. Much of the reduction is in the valve itself as I had to reduce the stem diameter to 5/16" to match the available retainer and locks. Also, to adjust the spring pressure properly (and the valve clearance) you have to move the shoulder on the valve higher.</p><p></p><p>I have been making valves to get a final valve design, but I have not been able to find a local machinist capable of doing the finished valves, which has stalled the project.</p><p></p><p>The benefit of using the beehives is primarily in the ability to use higher revs without valve float. Seeing that with the Gold Star springs the single can rev to 8500 without float to begin with, this would make running in that area a little more reliable. I thought being able to rev high for a short period would help in competition and at Bonneville. On a twin, unless you have a 9,000 rpm crank there is not much competitive benefit, but reliability may improve a bit at higher revs.</p><p></p><p>One of the side benefits of beehive spring is that the components are quite high quality and very inexpensive. The springs are about $12 and the titanium retainers are about $15. That helps when you have to pay for a custom valve.</p><p></p><p>David</p></blockquote><p></p>
[QUOTE="davidd, post: 91152, member: 1177"] I think so. I shimmed my Gold Star springs for 110 lbs. opening pressure which should be well within that range. When I selected a beehive spring replacement for the Gold Star springs on the racer I did not choose any of the springs listed by Bruce. I chose one that had 90 lbs. opening pressure. The tough part is selecting all the other pieces to work with the springs: retainer, locks, top valve guide and valve. It is relatively easy for a racer because the stock valve locks and valve would not necessarily be the first choice. If you have to custom make those two items, you might as well go to beehives. The reduction in mass of the beehive system is impressive. Much of the reduction is in the valve itself as I had to reduce the stem diameter to 5/16" to match the available retainer and locks. Also, to adjust the spring pressure properly (and the valve clearance) you have to move the shoulder on the valve higher. I have been making valves to get a final valve design, but I have not been able to find a local machinist capable of doing the finished valves, which has stalled the project. The benefit of using the beehives is primarily in the ability to use higher revs without valve float. Seeing that with the Gold Star springs the single can rev to 8500 without float to begin with, this would make running in that area a little more reliable. I thought being able to rev high for a short period would help in competition and at Bonneville. On a twin, unless you have a 9,000 rpm crank there is not much competitive benefit, but reliability may improve a bit at higher revs. One of the side benefits of beehive spring is that the components are quite high quality and very inexpensive. The springs are about $12 and the titanium retainers are about $15. That helps when you have to pay for a custom valve. David [/QUOTE]
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Valve Spring Reference
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