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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Pipe Flange
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<blockquote data-quote="delboy" data-source="post: 169874" data-attributes="member: 3596"><p>Of course, we all have a TIG welder......</p><p></p><p>My experience over the years with different manufactured pipes, and "original"/ repaired exhaust ports/different height barrels/etc, is that the flanging needs to be more of a compound angle rather than 90 degrees to the pipe, so that the flange meets the head near enough square. I've sometimes had to skim out the inside of rear head nuts to clear the pipe to screw in okay.</p><p>It's just another area that the works weren't exactly Thou's precise about. Take a look at the original acceptance jigs for exhaust pipes; how did they ever fit properly?</p><p>The instruction sheets say the pipes were 20 gauge thickness steel originally. Much easier to flange [although weaker] and, the thinner pipe may have allowed them to "settle" into place after a few heating and re-tightening cycles?</p><p>Having said that, over the years the majority of pipes made on the factory tooling that I have fitted have gone on with little fettling.</p><p>Strangely enough, the worst being Three-piece ones fitted to my own bike 30-odd years ago!</p><p>Carry on fettling.</p><p>delboy.</p></blockquote><p></p>
[QUOTE="delboy, post: 169874, member: 3596"] Of course, we all have a TIG welder...... My experience over the years with different manufactured pipes, and "original"/ repaired exhaust ports/different height barrels/etc, is that the flanging needs to be more of a compound angle rather than 90 degrees to the pipe, so that the flange meets the head near enough square. I've sometimes had to skim out the inside of rear head nuts to clear the pipe to screw in okay. It's just another area that the works weren't exactly Thou's precise about. Take a look at the original acceptance jigs for exhaust pipes; how did they ever fit properly? The instruction sheets say the pipes were 20 gauge thickness steel originally. Much easier to flange [although weaker] and, the thinner pipe may have allowed them to "settle" into place after a few heating and re-tightening cycles? Having said that, over the years the majority of pipes made on the factory tooling that I have fitted have gone on with little fettling. Strangely enough, the worst being Three-piece ones fitted to my own bike 30-odd years ago! Carry on fettling. delboy. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Pipe Flange
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