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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Standard Comet Special
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<blockquote data-quote="Oldhaven" data-source="post: 102313" data-attributes="member: 2879"><p>The TP camshaft is stamped with a 2. Somewhere I heard that his cam profiles have changed over the years , and as you can see below, it is very different from a similarly stamped Vincent 2. this is why I was wondering about the equal lift theory, since it seems like differently shaped and non symmetrical cams on the front and backside of their curves could be in different angular positions at that overlap. I find all this very confusing. I will try to check lift at TDC when I get there. I made a jig from the Vincent cam to press on the pinion, assuming that Terry's cam would use a similar angular geometry relative to the slot. The idea is to use the pin to locate the camshaft in the new pinion so I can use the pre-etched marks on the pinion for later assembly. The pin locates in the slot to get things started with the screw thread on the 1/2" spindle and is then backed out to allow completion of the press. (All those other holes were there for another purpose)</p><p> Thanks particularly for the advice about the cam bushes, and I will check for clearances (is .0015" to .002" OK for plain bronze?) after pressing the camshaft in, though now I wonder if I should swap them for a set of new porous bronze ET64's that I have. I don't think oilite should be reamed and I don't have a hone for that. More to worry about.</p><p></p><p>[ATTACH=full]25152[/ATTACH][ATTACH=full]25153[/ATTACH]</p></blockquote><p></p>
[QUOTE="Oldhaven, post: 102313, member: 2879"] The TP camshaft is stamped with a 2. Somewhere I heard that his cam profiles have changed over the years , and as you can see below, it is very different from a similarly stamped Vincent 2. this is why I was wondering about the equal lift theory, since it seems like differently shaped and non symmetrical cams on the front and backside of their curves could be in different angular positions at that overlap. I find all this very confusing. I will try to check lift at TDC when I get there. I made a jig from the Vincent cam to press on the pinion, assuming that Terry's cam would use a similar angular geometry relative to the slot. The idea is to use the pin to locate the camshaft in the new pinion so I can use the pre-etched marks on the pinion for later assembly. The pin locates in the slot to get things started with the screw thread on the 1/2" spindle and is then backed out to allow completion of the press. (All those other holes were there for another purpose) Thanks particularly for the advice about the cam bushes, and I will check for clearances (is .0015" to .002" OK for plain bronze?) after pressing the camshaft in, though now I wonder if I should swap them for a set of new porous bronze ET64's that I have. I don't think oilite should be reamed and I don't have a hone for that. More to worry about. [ATTACH=full]25152[/ATTACH][ATTACH=full]25153[/ATTACH] [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Standard Comet Special
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