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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Cam Wear
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<blockquote data-quote="Nigel Spaxman" data-source="post: 92920" data-attributes="member: 2907"><p>I made a tool to measure the seat pressure. Cyborg mentioned that Dan Smith had one. I figured I could make one faster than going and borrowing Dan's. I had an old rocker arm that someone had ground in the wrong place so I never want to use it and I had some old bronze rocker bushings that someone had made in Argentina. The tool uses a fish scale and the hole for the scale is four times further away from the valve than the rocker pin so the measure on the scale is 1/4th of the pressure on the spring. The spring opens at about 28 lbs on the scale which is around 112 lbs which is not bad. When the valve is near wide open it measures 44 lbs so that is 176 lbs. I guess this is only a little higher than it needs to be, according to Robert. Is this to much pressure? This is with some new springs, top collars and upper valve guides from Terry Prince. I think they are R&D springs. When I wore out the first cam lobe last year I was using standard valve springs top collars and upper valve guides, this was some stuff that came with my basket case. I don't know what pressure those had but the wear happened a lot more quickly and it was worse. I think it is likely that those springs were weaker than the ones I have now though. Those ones were larger in diameter.</p></blockquote><p></p>
[QUOTE="Nigel Spaxman, post: 92920, member: 2907"] I made a tool to measure the seat pressure. Cyborg mentioned that Dan Smith had one. I figured I could make one faster than going and borrowing Dan's. I had an old rocker arm that someone had ground in the wrong place so I never want to use it and I had some old bronze rocker bushings that someone had made in Argentina. The tool uses a fish scale and the hole for the scale is four times further away from the valve than the rocker pin so the measure on the scale is 1/4th of the pressure on the spring. The spring opens at about 28 lbs on the scale which is around 112 lbs which is not bad. When the valve is near wide open it measures 44 lbs so that is 176 lbs. I guess this is only a little higher than it needs to be, according to Robert. Is this to much pressure? This is with some new springs, top collars and upper valve guides from Terry Prince. I think they are R&D springs. When I wore out the first cam lobe last year I was using standard valve springs top collars and upper valve guides, this was some stuff that came with my basket case. I don't know what pressure those had but the wear happened a lot more quickly and it was worse. I think it is likely that those springs were weaker than the ones I have now though. Those ones were larger in diameter. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Cam Wear
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