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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
poor quality repop silencers
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<blockquote data-quote="John Emanuel" data-source="post: 88349" data-attributes="member: 1007"><p>[ATTACH=full]17867[/ATTACH] [ATTACH=full]17868[/ATTACH] [ATTACH=full]17869[/ATTACH] [ATTACH=full]17870[/ATTACH] [ATTACH=full]17871[/ATTACH] </p><p></p><p>Having found that the spares company spiral baffle silencer lost 4bhp and caused the engine to run very rich throughout the rev. range, I put the straight through absorption one back on the bike.</p><p></p><p>Sometime afterwards the bike failed the noise test at a Cadwell track day so I knew I had to do something.</p><p></p><p>Back in the early 1990’s Ron Kemp sent examples of various manufacturers of Vincent silencers for me to dyno test on my bike which then had a standard engine. The best was an extremely old, rusted through example, with a full diameter spiral baffle which we presumed must be an original Carbjector. It was as quiet as the hopelessly restrictive Campbell, didn’t affect the carburation and lost less than 2bhp compared with the straight through. At the time, I found a patent application by the Carbjector company from the early 1920’s which showed a spiral baffle the full diameter of the outer case, so I concluded that they really did make it that way.</p><p></p><p>In 2011 I made my take on the Carbjector silencer. It is a 3 ½”diameter, compared with the usual 3” or 3 ¼”and longer than usual to get as much volume as possible. There are three rows of holes at 60 degrees to weld the baffle to the outer case which is a length of 3 ½” by 16swg commercial tube. Armours sold me the end caps and the inlet and tail pipes came from the spares company silencer shown in the first photo. The spiral baffle I welded up from segments of just less than one turn which were made by a specialist firm, (it seems to be impossible to form a continuous spiral).</p><p></p><p>It passed the noise test at the next Cadwell track day at 98db and loses less than 1bhp compared with the straight through.</p></blockquote><p></p>
[QUOTE="John Emanuel, post: 88349, member: 1007"] [ATTACH=full]17867[/ATTACH] [ATTACH=full]17868[/ATTACH] [ATTACH=full]17869[/ATTACH] [ATTACH=full]17870[/ATTACH] [ATTACH=full]17871[/ATTACH] Having found that the spares company spiral baffle silencer lost 4bhp and caused the engine to run very rich throughout the rev. range, I put the straight through absorption one back on the bike. Sometime afterwards the bike failed the noise test at a Cadwell track day so I knew I had to do something. Back in the early 1990’s Ron Kemp sent examples of various manufacturers of Vincent silencers for me to dyno test on my bike which then had a standard engine. The best was an extremely old, rusted through example, with a full diameter spiral baffle which we presumed must be an original Carbjector. It was as quiet as the hopelessly restrictive Campbell, didn’t affect the carburation and lost less than 2bhp compared with the straight through. At the time, I found a patent application by the Carbjector company from the early 1920’s which showed a spiral baffle the full diameter of the outer case, so I concluded that they really did make it that way. In 2011 I made my take on the Carbjector silencer. It is a 3 ½”diameter, compared with the usual 3” or 3 ¼”and longer than usual to get as much volume as possible. There are three rows of holes at 60 degrees to weld the baffle to the outer case which is a length of 3 ½” by 16swg commercial tube. Armours sold me the end caps and the inlet and tail pipes came from the spares company silencer shown in the first photo. The spiral baffle I welded up from segments of just less than one turn which were made by a specialist firm, (it seems to be impossible to form a continuous spiral). It passed the noise test at the next Cadwell track day at 98db and loses less than 1bhp compared with the straight through. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
poor quality repop silencers
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