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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Silencer for Series C Comet
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<blockquote data-quote="Peter Stokes" data-source="post: 32634" data-attributes="member: 781"><p><span style="font-family: 'Arial'"><span style="font-size: 12px"><span style="color: #000000">This is not directly Vincent related, but is a bit more about Armours products. I got some stainless pipes and silencers from Armours a few years ago for my old 750 Ducati. The pipes fitted a treat, and are still on the bike. The silencers were astonishingly noisy, deafening. If there is any silencing material in them I would be very surprised. I kept them on for about a week and then couldn’t stand them any longer. They sit back in their box, and the old silencers are back on the bike.</span></span></span></p><p><span style="font-family: 'Arial'"><span style="font-size: 12px"><span style="color: #000000">This is where the behaviour of the old silencers is odd. There were two types of silencers for these bikes when they were new, the noisy Contis, which some folk like, and the quieter Lafranconis, which my bike has, and which I like. These are a labyrinth type where the exhaust gases take a longer path, backwards and forwards through pipes within pipes. I have a set of these on the bike, but they are getting on a bit, and have corroded inside. You should definitely not be able to see through these, but the end plates in the inner pipes have rusted and blown through, so now you can. They are now straight-through silencers and you would expect them to be very noisy, <em>but they are not</em>. They have remained like this for a few years without getting worse, but I’ll be stuffed for replacements when they rust through to the outside.</span></span></span></p><p><span style="font-family: 'Arial'"><span style="font-size: 12px"><span style="color: #000000"> So – I think that the behaviour of silencers is some dark art, not to be understood by me. </span></span></span></p><p><span style="font-family: 'Arial'"><span style="font-size: 12px"><span style="color: #000000">Quote from Vibrac – ‘... he has a cross pipe at right angles with a blind end...’</span></span></span></p><p><span style="font-family: 'Arial'"><span style="font-size: 12px"><span style="color: #000000">That is very interesting – so, on the twin, does the pipe of the cylinder which is not firing present a dead-end branch of the exhaust pipe, so quietening the exhaust on the twin compared to the Comet? I appreciate that it is a complex system, a dynamic system where the next exhaust pulse has some effect on the last one, and vice versa. Complicated! </span></span></span></p><p><span style="font-family: 'Arial'"><span style="font-size: 12px"><span style="color: #000000">Pete</span></span></span></p></blockquote><p></p>
[QUOTE="Peter Stokes, post: 32634, member: 781"] [FONT=Arial][SIZE=3][COLOR=#000000]This is not directly Vincent related, but is a bit more about Armours products. I got some stainless pipes and silencers from Armours a few years ago for my old 750 Ducati. The pipes fitted a treat, and are still on the bike. The silencers were astonishingly noisy, deafening. If there is any silencing material in them I would be very surprised. I kept them on for about a week and then couldn’t stand them any longer. They sit back in their box, and the old silencers are back on the bike.[/COLOR][/SIZE][/FONT] [FONT=Arial][SIZE=3][COLOR=#000000]This is where the behaviour of the old silencers is odd. There were two types of silencers for these bikes when they were new, the noisy Contis, which some folk like, and the quieter Lafranconis, which my bike has, and which I like. These are a labyrinth type where the exhaust gases take a longer path, backwards and forwards through pipes within pipes. I have a set of these on the bike, but they are getting on a bit, and have corroded inside. You should definitely not be able to see through these, but the end plates in the inner pipes have rusted and blown through, so now you can. They are now straight-through silencers and you would expect them to be very noisy, [I]but they are not[/I]. They have remained like this for a few years without getting worse, but I’ll be stuffed for replacements when they rust through to the outside.[/COLOR][/SIZE][/FONT] [FONT=Arial][SIZE=3][COLOR=#000000] So – I think that the behaviour of silencers is some dark art, not to be understood by me. [/COLOR][/SIZE][/FONT] [FONT=Arial][SIZE=3][COLOR=#000000]Quote from Vibrac – ‘... he has a cross pipe at right angles with a blind end...’[/COLOR][/SIZE][/FONT] [FONT=Arial][SIZE=3][COLOR=#000000]That is very interesting – so, on the twin, does the pipe of the cylinder which is not firing present a dead-end branch of the exhaust pipe, so quietening the exhaust on the twin compared to the Comet? I appreciate that it is a complex system, a dynamic system where the next exhaust pulse has some effect on the last one, and vice versa. Complicated! [/COLOR][/SIZE][/FONT] [FONT=Arial][SIZE=3][COLOR=#000000]Pete[/COLOR][/SIZE][/FONT] [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Silencer for Series C Comet
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