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Tech. Advice: Series 'A' 500cc/1000cc Bikes
"A" twin balance factor
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<blockquote data-quote="Magnetoman" data-source="post: 88143" data-attributes="member: 2806"><p>Although I don't know the answer to your question, I would be surprised if the balance factor were the same. Quoting Phil Irving in 'Motorcycle Engineering' on why the balance factor is important (with examples specifically for a single), with emphasis added by me:</p><p><em></em></p><p><em>"Usually, a balance factor of 60-65 per cent, will be found to be correct, but it may vary widely; the factor for the MOV Velocette was as high as 85 per cent., while some engines have been down to 40 per cent... Because <strong>the eventual smoothness obtained depends so much upon the frame, a balance factor which suits one installation may not suit another</strong>... An instance of this was found in the original Vincent-H.R.D. singles. These engines ran very smoothly in the standard spring frame with a factor of 66 per cent., but the speed way versions, of which a very few were made, vibrated badly in a cobwebby dirt-track frame until the factor was reduced to 61 per cent., this not-very-large reduction making all the difference between a machine which was passably smooth and one which shook itself out of your hands."</em></p></blockquote><p></p>
[QUOTE="Magnetoman, post: 88143, member: 2806"] Although I don't know the answer to your question, I would be surprised if the balance factor were the same. Quoting Phil Irving in 'Motorcycle Engineering' on why the balance factor is important (with examples specifically for a single), with emphasis added by me: [I] "Usually, a balance factor of 60-65 per cent, will be found to be correct, but it may vary widely; the factor for the MOV Velocette was as high as 85 per cent., while some engines have been down to 40 per cent... Because [B]the eventual smoothness obtained depends so much upon the frame, a balance factor which suits one installation may not suit another[/B]... An instance of this was found in the original Vincent-H.R.D. singles. These engines ran very smoothly in the standard spring frame with a factor of 66 per cent., but the speed way versions, of which a very few were made, vibrated badly in a cobwebby dirt-track frame until the factor was reduced to 61 per cent., this not-very-large reduction making all the difference between a machine which was passably smooth and one which shook itself out of your hands."[/I] [/QUOTE]
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Tech. Advice: Series 'A' 500cc/1000cc Bikes
"A" twin balance factor
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