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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Valve Timing
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<blockquote data-quote="davidd" data-source="post: 127159" data-attributes="member: 1177"><p>Nigel,</p><p></p><p>They are not the same cam. This is the problem with calling a cam "105". The Godet and Robinson cams are identical. The Prince cam is not. The Prince cam has its LSA at 105 while the other cams have LSAs at 109.5 degrees. The Prince cam also has a much higher lift.</p><p></p><p>The 105 cam is supposed to be timed with max lift at 105, but I found when it was correctly timed it had max lift at 108-111. So, the 105 does not refer to anything on the cam. With Terry's cam at least the 105 refers to something on the cam....the LSA.</p><p></p><p>Patrick gained 7 bhp on his Rapide with the 105 cam. We lost 4 bhp on the Comet using the same timing as Patrick. It was a lot of work to install the cam and run it on the dyno for such a big loss in power. </p><p></p><p>David</p></blockquote><p></p>
[QUOTE="davidd, post: 127159, member: 1177"] Nigel, They are not the same cam. This is the problem with calling a cam "105". The Godet and Robinson cams are identical. The Prince cam is not. The Prince cam has its LSA at 105 while the other cams have LSAs at 109.5 degrees. The Prince cam also has a much higher lift. The 105 cam is supposed to be timed with max lift at 105, but I found when it was correctly timed it had max lift at 108-111. So, the 105 does not refer to anything on the cam. With Terry's cam at least the 105 refers to something on the cam....the LSA. Patrick gained 7 bhp on his Rapide with the 105 cam. We lost 4 bhp on the Comet using the same timing as Patrick. It was a lot of work to install the cam and run it on the dyno for such a big loss in power. David [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Valve Timing
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