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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: 113773" data-attributes="member: 1177"><p>Renwick provided the cams for my engines and they had lift up in the .490" area. Max power at 6900 rpm. Power numbers for the single were 43 BHP. None of the lower lift cams provided this power. Max power for the Mk2 is about 37 BHP at 5900 rpm. </p><p></p><p>For landspeed I have reved to 8500 with no float, but there is no power up that high. It is also 5020 ft/min piston speed which is very high. </p><p></p><p>I don't know what to say about the .440 lift max. It could be true. I have found the Vincent to be very reliable, which could mean that the power is still too low. I have never encountered any inclination of the valves to float or detonation. </p><p></p><p>I have run stock valves with the high lift cams, but it does not work 100%. The last engine I built the button hit the intake valve guide even though all the components had worked before. Some clearance went away during the rebuild which was so small it could not be felt by hand. I took this to mean that I was right on the edge of usability. My hope was that if I moved the shoulder of the valve up a bit I could get back to setting up the system nearer to the middle, rather than the edge.</p><p></p><p>As for Mike, it is difficult to know about valve bounce without knowing the installed height and pounds generated on the seat. I do know these springs work on the Fords and there is a Gold Star in AHRMA that has been racing with these spring for years. I don't think the beehive springs will give more power. For me it was a path to getting a better valve design for racing (to help the clearance issue) and spring set-up that was light and simple.</p><p></p><p>As for the blow up, I suspect it was just like my blow up. The big end bearings crunched up and the stroke became considerably longer, the piston hammering the head until something gave. It is a 600 also.</p><p>[ATTACH=full]30720[/ATTACH]</p><p></p><p>David</p></blockquote><p></p>
[QUOTE="davidd, post: 113773, member: 1177"] Renwick provided the cams for my engines and they had lift up in the .490" area. Max power at 6900 rpm. Power numbers for the single were 43 BHP. None of the lower lift cams provided this power. Max power for the Mk2 is about 37 BHP at 5900 rpm. For landspeed I have reved to 8500 with no float, but there is no power up that high. It is also 5020 ft/min piston speed which is very high. I don't know what to say about the .440 lift max. It could be true. I have found the Vincent to be very reliable, which could mean that the power is still too low. I have never encountered any inclination of the valves to float or detonation. I have run stock valves with the high lift cams, but it does not work 100%. The last engine I built the button hit the intake valve guide even though all the components had worked before. Some clearance went away during the rebuild which was so small it could not be felt by hand. I took this to mean that I was right on the edge of usability. My hope was that if I moved the shoulder of the valve up a bit I could get back to setting up the system nearer to the middle, rather than the edge. As for Mike, it is difficult to know about valve bounce without knowing the installed height and pounds generated on the seat. I do know these springs work on the Fords and there is a Gold Star in AHRMA that has been racing with these spring for years. I don't think the beehive springs will give more power. For me it was a path to getting a better valve design for racing (to help the clearance issue) and spring set-up that was light and simple. As for the blow up, I suspect it was just like my blow up. The big end bearings crunched up and the stroke became considerably longer, the piston hammering the head until something gave. It is a 600 also. [ATTACH type="full"]30720[/ATTACH] David [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Valve Springs
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