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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
ET35 to valve guide clearance
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<blockquote data-quote="davidd" data-source="post: 126644" data-attributes="member: 1177"><p>0.010" seems too little to me, but I am not certain about the limits. I had one of my cams clear the guide during building (it had run on the cam for years) but when running after the rebuild, the collar hit the guide. I had not measured the clearance because it had been clearanced years ago and had worked fine. Something during the rebuild caused the clearance to tighten. It did damage the cam. The dynamic clearance needs to be larger than the static clearance.</p><p></p><p>To be safe, I need to make new valves with the shoulder on the valve slightly higher. Greg Brillus did this on his twin racer by raising the valve shoulder 0.080", I believe.</p><p></p><p>I am surprised that the clearance on the Norvin is so small, because the lift of the 105 intake valve lift is modest at 0.020" more than a Mk2 (still below 0.4"), while the ex valve lift is the same or lower than a Mk2. My cam has a 0.48" lift, so the clearance should be there for a much lower lift cam.</p><p></p><p>David</p></blockquote><p></p>
[QUOTE="davidd, post: 126644, member: 1177"] 0.010" seems too little to me, but I am not certain about the limits. I had one of my cams clear the guide during building (it had run on the cam for years) but when running after the rebuild, the collar hit the guide. I had not measured the clearance because it had been clearanced years ago and had worked fine. Something during the rebuild caused the clearance to tighten. It did damage the cam. The dynamic clearance needs to be larger than the static clearance. To be safe, I need to make new valves with the shoulder on the valve slightly higher. Greg Brillus did this on his twin racer by raising the valve shoulder 0.080", I believe. I am surprised that the clearance on the Norvin is so small, because the lift of the 105 intake valve lift is modest at 0.020" more than a Mk2 (still below 0.4"), while the ex valve lift is the same or lower than a Mk2. My cam has a 0.48" lift, so the clearance should be there for a much lower lift cam. David [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
ET35 to valve guide clearance
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