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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Series ‘C’ Comet Camshafts
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<blockquote data-quote="davidd" data-source="post: 104338" data-attributes="member: 1177"><p>The Mk1 or Mk3 are perfectly easy to measure. You just can't use the mostly useless Vincent method. The Megacycle Mk1 times at 0.040"valve lift as:</p><p></p><p>IO 30</p><p>IC 44</p><p>EO 44</p><p>EC 30</p><p></p><p>I don't know the valve height at which Patrick measured to get his figures.</p><p></p><p>Below is a graph of a Megacycle Mk1 with measurements taken every 10 degrees.</p><p>[ATTACH=full]25855[/ATTACH]</p><p>Vincent found on the dyno that the engine tended to produce more power when equal lift was moved to 4 degrees. It may have little relevance today as most engines and the fuels they use vary quite a bit from what was used in the late 1940's. However, all the literature and diagrams show the four degrees.</p><p></p><p>David</p></blockquote><p></p>
[QUOTE="davidd, post: 104338, member: 1177"] The Mk1 or Mk3 are perfectly easy to measure. You just can't use the mostly useless Vincent method. The Megacycle Mk1 times at 0.040"valve lift as: IO 30 IC 44 EO 44 EC 30 I don't know the valve height at which Patrick measured to get his figures. Below is a graph of a Megacycle Mk1 with measurements taken every 10 degrees. [ATTACH type="full" alt="25855"]25855[/ATTACH] Vincent found on the dyno that the engine tended to produce more power when equal lift was moved to 4 degrees. It may have little relevance today as most engines and the fuels they use vary quite a bit from what was used in the late 1940's. However, all the literature and diagrams show the four degrees. David [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Series ‘C’ Comet Camshafts
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