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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
poor quality repop silencers
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<blockquote data-quote="tatty500" data-source="post: 88302" data-attributes="member: 2532"><p>John,</p><p>Oh, how I remember my original spiral baffle back in the 1970's on the twin. The spiral, being made up of bits on the central tube, would have been nigh-on impossible to weld in many places to the outer casing. Bits of the spiral would break away and eventually cause severe power loss when they arrived at the tailpipe. Shutting the throttle would suck them back and power would be again restored (for a bit). Many bits became small enough to be ejected. Eventually the remains of the spiral sub-assembly started to float back and forth inside, but application of a ball-pein hammer to the shell stopped this for a while.</p><p></p><p>Similarly the Hillgate one on the tatty Comet which was unused when I commissioned it has chucked several bits out the back. This also suffered from the fact that the entry to the spiral was very small and tight whereas the original appears to have a more open, less tightly wound start turn.</p><p></p><p>That's the first time I've seen the insides of a new one and I suspect that the fitting of the spiral into the perforated inner casing has allowed the spiral to be welded at its outside diameter at many places to prolong life......without making a mess of the nice shiny outside. A Comet bark is loud after the silencer....can't imagine how percussive it is at the inlet end.</p><p></p><p>Tatty</p></blockquote><p></p>
[QUOTE="tatty500, post: 88302, member: 2532"] John, Oh, how I remember my original spiral baffle back in the 1970's on the twin. The spiral, being made up of bits on the central tube, would have been nigh-on impossible to weld in many places to the outer casing. Bits of the spiral would break away and eventually cause severe power loss when they arrived at the tailpipe. Shutting the throttle would suck them back and power would be again restored (for a bit). Many bits became small enough to be ejected. Eventually the remains of the spiral sub-assembly started to float back and forth inside, but application of a ball-pein hammer to the shell stopped this for a while. Similarly the Hillgate one on the tatty Comet which was unused when I commissioned it has chucked several bits out the back. This also suffered from the fact that the entry to the spiral was very small and tight whereas the original appears to have a more open, less tightly wound start turn. That's the first time I've seen the insides of a new one and I suspect that the fitting of the spiral into the perforated inner casing has allowed the spiral to be welded at its outside diameter at many places to prolong life......without making a mess of the nice shiny outside. A Comet bark is loud after the silencer....can't imagine how percussive it is at the inlet end. Tatty [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
poor quality repop silencers
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