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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Camshaft design
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<blockquote data-quote="eglijim" data-source="post: 91357" data-attributes="member: 441"><p>Thank's for that . I had been involved with Ian since joining the recently disbanded Avon Valley MCC in Strathaven when I was 16 till the time of his final outing at Cadwell , Ian and Vicky were at "ours" that Easter weekend as I live 30 mins from the circuit. There was an aim in the cam designs to try to extend the usable power band an extra few hundred RPM from the existing peak at around 6300, we had "enough"torque. This was why the bore was increased eventually to 94mm while staying with the 90 stroke with all of the extra diameter used to generate a circumferential squish band machined into the cylinder head by 172 thou. We had tried ratio rockers but the dyno showed no significant gains for the extra strain on the valvegear. We were also lucky to have had very good advice from people who knew what worked previously , Ted Davis initially and then Leon Moss at LEDAR whose dyno we used frequently and a few other friends and specialists who all pooled their knowledge without hindrance. Luckily we both had a scientific background and a mechanical bent, Ian had a Phd in Applied Physics and I had been a metallurgist with British Steel. </p><p>When Ian was elected "club captain" of the AVMCC there was a fine in place of 1 shilling for any member who overtook the captain on a club run. Many tried but few managed when Ian was on his Rap and pressing on over the moors, paying was seen as a major prize by any member quick enough to go by. We scared a lot of sheep on the unfenced roads.</p></blockquote><p></p>
[QUOTE="eglijim, post: 91357, member: 441"] Thank's for that . I had been involved with Ian since joining the recently disbanded Avon Valley MCC in Strathaven when I was 16 till the time of his final outing at Cadwell , Ian and Vicky were at "ours" that Easter weekend as I live 30 mins from the circuit. There was an aim in the cam designs to try to extend the usable power band an extra few hundred RPM from the existing peak at around 6300, we had "enough"torque. This was why the bore was increased eventually to 94mm while staying with the 90 stroke with all of the extra diameter used to generate a circumferential squish band machined into the cylinder head by 172 thou. We had tried ratio rockers but the dyno showed no significant gains for the extra strain on the valvegear. We were also lucky to have had very good advice from people who knew what worked previously , Ted Davis initially and then Leon Moss at LEDAR whose dyno we used frequently and a few other friends and specialists who all pooled their knowledge without hindrance. Luckily we both had a scientific background and a mechanical bent, Ian had a Phd in Applied Physics and I had been a metallurgist with British Steel. When Ian was elected "club captain" of the AVMCC there was a fine in place of 1 shilling for any member who overtook the captain on a club run. Many tried but few managed when Ian was on his Rap and pressing on over the moors, paying was seen as a major prize by any member quick enough to go by. We scared a lot of sheep on the unfenced roads. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Camshaft design
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