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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Rear Frame Member alignment and repairs to achieve alignment
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<blockquote data-quote="Monkeypants" data-source="post: 131304" data-attributes="member: 2708"><p>They are offset. I became aware of that fact when searching around for Egli frame drawings.</p><p>There is a very nicely drawn Egli swing arm drawing out there that is symmetrical. It will not work with a Vincent engine. For a standard type Egli which uses standard dimension head brackets, the swing arm needs to be built to the same offset as a standard Vincent RFM . A friend warned me about the symmetrical drawing, which was a good thing as I had it and was considering building from it before learning of the offset. He had spent a great deal of time building a beautiful swing arm to that drawing, only to chuck it in the scrap bin after discovering it would not work with the Vincent engine.</p><p></p><p>In the end I did something quite different (monoshock and 180 rear tire) and that required an even greater offset in both the head brackets and swing arm. None of the collection of Egli frame drawings that are readily available would suit my plans.</p><p>It was simple enough to make a full sized drawing based on what was needed.</p><p>Since then I've noticed that most motorcycles have some sort of offset in the swing arm.</p><p>It's like Bill says, the designers must design the swing arm last and just make the offset whatever it has to be in order to line everything up.</p><p>Come to think of it, that's what I did as well!</p><p></p><p>Glen</p></blockquote><p></p>
[QUOTE="Monkeypants, post: 131304, member: 2708"] They are offset. I became aware of that fact when searching around for Egli frame drawings. There is a very nicely drawn Egli swing arm drawing out there that is symmetrical. It will not work with a Vincent engine. For a standard type Egli which uses standard dimension head brackets, the swing arm needs to be built to the same offset as a standard Vincent RFM . A friend warned me about the symmetrical drawing, which was a good thing as I had it and was considering building from it before learning of the offset. He had spent a great deal of time building a beautiful swing arm to that drawing, only to chuck it in the scrap bin after discovering it would not work with the Vincent engine. In the end I did something quite different (monoshock and 180 rear tire) and that required an even greater offset in both the head brackets and swing arm. None of the collection of Egli frame drawings that are readily available would suit my plans. It was simple enough to make a full sized drawing based on what was needed. Since then I've noticed that most motorcycles have some sort of offset in the swing arm. It's like Bill says, the designers must design the swing arm last and just make the offset whatever it has to be in order to line everything up. Come to think of it, that's what I did as well! Glen [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Rear Frame Member alignment and repairs to achieve alignment
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