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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Twin Cam Timing Conundrum!
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<blockquote data-quote="passenger0_0" data-source="post: 90150" data-attributes="member: 208"><p>This is because there is a 2:1 reduction between the crankshaft and camshaft. Since you're measuring crankshaft angle you'll always get twice the angle change when change one tooth on the cam pinion.</p><p></p><p>Why don't you leave the cam phasing the same so that there is 5 degrees difference between front and rear and then split this difference by moving the keyway on the crank pinion so that one inlet open 2.5 degrees early and the other 2.5 degrees late from factory figures? Unless highly modified, most Vincent twin motors won't notice this small variation.</p></blockquote><p></p>
[QUOTE="passenger0_0, post: 90150, member: 208"] This is because there is a 2:1 reduction between the crankshaft and camshaft. Since you're measuring crankshaft angle you'll always get twice the angle change when change one tooth on the cam pinion. Why don't you leave the cam phasing the same so that there is 5 degrees difference between front and rear and then split this difference by moving the keyway on the crank pinion so that one inlet open 2.5 degrees early and the other 2.5 degrees late from factory figures? Unless highly modified, most Vincent twin motors won't notice this small variation. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Twin Cam Timing Conundrum!
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