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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
What's my Black Shadow balance factor?
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<blockquote data-quote="timetraveller" data-source="post: 94450" data-attributes="member: 456"><p>You can ignore the big end weights. What matters is the weight of the small ends and the weight of the two piston assemblies (complete). You are trying to balance some percentage of that total weight in such a way that the flywheels will not rotated when that percentage weight is applied at the small ends. So to take your figures; the two small ends weigh 374 gm. The two piston assemblies weigh 930 gm. Total 1304 gm. 46% of that is 600 gm. However, you cannot change the weight of the small ends so you subtract that weight, 374 gm from the 600 gm figure which gives 226 gm and that is the weight which you would have to add to the small ends in order to obtain a 46% balance factor. You were adding 220 gm. which I would consider near enough but if you want to work out exactly what balance factor you have then use 220 rather than 226 in the above calculation and work backwards. If this is not clear then you will have to do what I did about sixty years ago and read a book on engine tuning for motor cycles and in there you will find the whole thing explained better than I can in a brief item here. It is good to have an enquiring mind.<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p></blockquote><p></p>
[QUOTE="timetraveller, post: 94450, member: 456"] You can ignore the big end weights. What matters is the weight of the small ends and the weight of the two piston assemblies (complete). You are trying to balance some percentage of that total weight in such a way that the flywheels will not rotated when that percentage weight is applied at the small ends. So to take your figures; the two small ends weigh 374 gm. The two piston assemblies weigh 930 gm. Total 1304 gm. 46% of that is 600 gm. However, you cannot change the weight of the small ends so you subtract that weight, 374 gm from the 600 gm figure which gives 226 gm and that is the weight which you would have to add to the small ends in order to obtain a 46% balance factor. You were adding 220 gm. which I would consider near enough but if you want to work out exactly what balance factor you have then use 220 rather than 226 in the above calculation and work backwards. If this is not clear then you will have to do what I did about sixty years ago and read a book on engine tuning for motor cycles and in there you will find the whole thing explained better than I can in a brief item here. It is good to have an enquiring mind.:) [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
What's my Black Shadow balance factor?
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