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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Camshaft design
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<blockquote data-quote="davidd" data-source="post: 88760" data-attributes="member: 1177"><p>Eddy,</p><p></p><p>Just convince yourself that the new cam machine will inhabit the cumulative space presently occupied by the scraps used to build this wonderful contraption!</p><p></p><p>I must admit I find this really useful. Here is a better shot of the workings:</p><p></p><p>[ATTACH=full]18047[/ATTACH]</p><p></p><p>It was the only good place to use an aluminum large idler boss. The turning handle is quite high because it was designed to do the long cam also. You can add or move spacers and bring the half time and idler gear up to a higher position. The local lobster pound provides the valve springs. The 11" disc makes for easy reading.</p><p></p><p>I originally wanted to read off the valve stems, which is most accurate. Unfortunately, it was very difficult to duplicate the internal geometry of the heads to get the best readings. Some day I will take readings off cams coming out of an engine, put them in the machine and adjust the components until I get the same readings. Until then, the push rod geometry is relatively easy to duplicate, so I take the readings off the adjusters. This is fine for determining what the cam is, the timing events and any defects there may be.</p><p></p><p>[ATTACH=full]18051[/ATTACH]</p><p></p><p>In this shot you can see some cam gear wheels that have been modified. Pat Manning turned the ID larger and pressed in an aluminum ring. This was sized for a "tap fit" of the cam into the gear wheel. This way you can do a bare shaft by tapping it into a wheel that will not damage anything.</p><p></p><p>If I am understanding Roger correctly, this is exactly what he needs. He could run his cams through and note their timing and condition. I think it would be a lovely thing for someone in an active UK section to do. I have checked cams for others through the mail, but it is nice to have one locally.</p><p></p><p>David</p></blockquote><p></p>
[QUOTE="davidd, post: 88760, member: 1177"] Eddy, Just convince yourself that the new cam machine will inhabit the cumulative space presently occupied by the scraps used to build this wonderful contraption! I must admit I find this really useful. Here is a better shot of the workings: [ATTACH=full]18047[/ATTACH] It was the only good place to use an aluminum large idler boss. The turning handle is quite high because it was designed to do the long cam also. You can add or move spacers and bring the half time and idler gear up to a higher position. The local lobster pound provides the valve springs. The 11" disc makes for easy reading. I originally wanted to read off the valve stems, which is most accurate. Unfortunately, it was very difficult to duplicate the internal geometry of the heads to get the best readings. Some day I will take readings off cams coming out of an engine, put them in the machine and adjust the components until I get the same readings. Until then, the push rod geometry is relatively easy to duplicate, so I take the readings off the adjusters. This is fine for determining what the cam is, the timing events and any defects there may be. [ATTACH=full]18051[/ATTACH] In this shot you can see some cam gear wheels that have been modified. Pat Manning turned the ID larger and pressed in an aluminum ring. This was sized for a "tap fit" of the cam into the gear wheel. This way you can do a bare shaft by tapping it into a wheel that will not damage anything. If I am understanding Roger correctly, this is exactly what he needs. He could run his cams through and note their timing and condition. I think it would be a lovely thing for someone in an active UK section to do. I have checked cams for others through the mail, but it is nice to have one locally. David [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Camshaft design
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