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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Vincent Silencer
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<blockquote data-quote="John Emanuel" data-source="post: 18216" data-attributes="member: 1007"><p>Back in the early 1990s Ron Kemp let me have a number of sample silencers which he had obtained from various suppliers to be tested on my twin on the dyno. The straight through silencer gave 46bhp but was the noisiest. The others with varying degrees of restriction gave less, the worst giving 38bhp and upsetting the carburation causing a flat spot low down. It seems that, as it is not possible to have a large volume in the silencer, it is a trade off between noise and performance. However, Ron also sent a very old and rusty silencer which I am sure was an original Carbjector. This only reduced the performance slightly, was quiet and we all agreed was the best compromise.</p><p>I didn't cut it up to see how it was made ( it wasn't mine!...and at that time I had no thoughts of making one). but I did what I could to look inside by spraying white ink from either end. The baffle was a proper spiral the full 3 1/8th inches of the inside diameter of the centre part of the silencer and the pitch was such that the cross sectional area of the passage through the baffle was roughly equal to the cross sectional area of the exhaust pipe. I wish it was still around... it would be most interesting to cut it up to see how it was made.</p></blockquote><p></p>
[QUOTE="John Emanuel, post: 18216, member: 1007"] Back in the early 1990s Ron Kemp let me have a number of sample silencers which he had obtained from various suppliers to be tested on my twin on the dyno. The straight through silencer gave 46bhp but was the noisiest. The others with varying degrees of restriction gave less, the worst giving 38bhp and upsetting the carburation causing a flat spot low down. It seems that, as it is not possible to have a large volume in the silencer, it is a trade off between noise and performance. However, Ron also sent a very old and rusty silencer which I am sure was an original Carbjector. This only reduced the performance slightly, was quiet and we all agreed was the best compromise. I didn't cut it up to see how it was made ( it wasn't mine!...and at that time I had no thoughts of making one). but I did what I could to look inside by spraying white ink from either end. The baffle was a proper spiral the full 3 1/8th inches of the inside diameter of the centre part of the silencer and the pitch was such that the cross sectional area of the passage through the baffle was roughly equal to the cross sectional area of the exhaust pipe. I wish it was still around... it would be most interesting to cut it up to see how it was made. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Vincent Silencer
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