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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Camshaft design
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<blockquote data-quote="Phil Davies" data-source="post: 91336" data-attributes="member: 2541"><p>Eglijim, to you (and Ian) I salute, as Ian (and you, it would appear) was (were) one of the very few tuners (and one of the microscopically small vincent tuners!) that could quantify what the outcome was of specifically changing something - proper tuning and he was a nice bloke as well!!.</p><p>Most of the rest (me included, back in the day) just 'felt' the outcome of a change.</p><p></p><p>As for me and cam forms, I am building what would have been my next development twin race engine if I had carried on historic racing (I stopped to go two stroke moderns) and that includes 'pusher' cam followers - so that I can use post 1948 development cam forms.</p><p>I am no skilled engineer (lots of people that know me will OK that statement!) but use lots of mechanical common sense (well sometimes). There is quite a range of modern workable materials that I can use to develop a follower radius and cam profile (possibly to generating a master that will do for me), its just a question of knowing what lift/rotation rate is acceptable (for the valve train) for each phase of the profile and a lot of time, but between them, old and modern BSA/Norton/AMC cams will no doubt assist me in that quest.</p><p>Having said all that did Eglijim and Ian secretly discover the holy grail in the 108s??</p><p></p><p>I mean, even PEI acknowledged that race cam form had moved on since his MK2s in 1948!</p></blockquote><p></p>
[QUOTE="Phil Davies, post: 91336, member: 2541"] Eglijim, to you (and Ian) I salute, as Ian (and you, it would appear) was (were) one of the very few tuners (and one of the microscopically small vincent tuners!) that could quantify what the outcome was of specifically changing something - proper tuning and he was a nice bloke as well!!. Most of the rest (me included, back in the day) just 'felt' the outcome of a change. As for me and cam forms, I am building what would have been my next development twin race engine if I had carried on historic racing (I stopped to go two stroke moderns) and that includes 'pusher' cam followers - so that I can use post 1948 development cam forms. I am no skilled engineer (lots of people that know me will OK that statement!) but use lots of mechanical common sense (well sometimes). There is quite a range of modern workable materials that I can use to develop a follower radius and cam profile (possibly to generating a master that will do for me), its just a question of knowing what lift/rotation rate is acceptable (for the valve train) for each phase of the profile and a lot of time, but between them, old and modern BSA/Norton/AMC cams will no doubt assist me in that quest. Having said all that did Eglijim and Ian secretly discover the holy grail in the 108s?? I mean, even PEI acknowledged that race cam form had moved on since his MK2s in 1948! [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Camshaft design
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