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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Silencer for Series C Comet
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<blockquote data-quote="John Emanuel" data-source="post: 32657" data-attributes="member: 1007"><p>Hi Matty,</p><p>You said that you didn't think that quietness was a consideration when I set out to make a silencer. It was! Four years ago I went to the Classic Bike track day at Cadwell and failed the noise test. That concentrated the mind!! Anyway, I've never liked niosy bikes.</p><p>I came accross a sectioned drawing of the Shadow from the Motor Cycle magazine in 1949 which showed a sectioned Carbjector silencer. The spiral baffle was the full diameter of the fat part. This is what I aimed to copy. I cheated, in that I wanted to get as much volume as possible whilst still keeping a silencer which looked fairly standard. It's a little longer than most and 3 1/2 in diameter where most are 3 1/4in. (The early VOSC one was only 3in and hopelessly restrictive). Armours sold me the end caps and I found a firm who made segments for the spiral baffle. The resulting silencer passed the following year's track day noise test with 10db to spare and the power output is only a couple of bhp. down at the top end compaired with a straight through silencer.</p><p>Unfortunately, when it was fitted to Mark Goodson's 600cc Comet it was not much quieter than the new absorbsion silencer which he was running.</p><p></p><p>Best wishes </p><p>John</p></blockquote><p></p>
[QUOTE="John Emanuel, post: 32657, member: 1007"] Hi Matty, You said that you didn't think that quietness was a consideration when I set out to make a silencer. It was! Four years ago I went to the Classic Bike track day at Cadwell and failed the noise test. That concentrated the mind!! Anyway, I've never liked niosy bikes. I came accross a sectioned drawing of the Shadow from the Motor Cycle magazine in 1949 which showed a sectioned Carbjector silencer. The spiral baffle was the full diameter of the fat part. This is what I aimed to copy. I cheated, in that I wanted to get as much volume as possible whilst still keeping a silencer which looked fairly standard. It's a little longer than most and 3 1/2 in diameter where most are 3 1/4in. (The early VOSC one was only 3in and hopelessly restrictive). Armours sold me the end caps and I found a firm who made segments for the spiral baffle. The resulting silencer passed the following year's track day noise test with 10db to spare and the power output is only a couple of bhp. down at the top end compaired with a straight through silencer. Unfortunately, when it was fitted to Mark Goodson's 600cc Comet it was not much quieter than the new absorbsion silencer which he was running. Best wishes John [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Silencer for Series C Comet
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