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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Comet silencer
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<blockquote data-quote="vibrac" data-source="post: 100881" data-attributes="member: 60"><p>My last attempt on the Flash to get down to 105 Db for P6 parades at BHR meetings and still look age related I used a 2inch perforated pipe inside a 3inch alloy tube with 1/4" walls. Packing the 1/4 annulus with fibre packing and the ends were turned from solid ally again with 1/4" walls, the idea being that thin walls transmit sounds. I got about 104 Db and it passed. </p><p>Nowadays I dont bother with BHR as we cant race the Vincent Comet there so I am dammed if I will bother to parade with them. and I have found that at the events like Kop Hill and Bicester they actually enjoy the noise of a straight through 2" and why not?</p></blockquote><p></p>
[QUOTE="vibrac, post: 100881, member: 60"] My last attempt on the Flash to get down to 105 Db for P6 parades at BHR meetings and still look age related I used a 2inch perforated pipe inside a 3inch alloy tube with 1/4" walls. Packing the 1/4 annulus with fibre packing and the ends were turned from solid ally again with 1/4" walls, the idea being that thin walls transmit sounds. I got about 104 Db and it passed. Nowadays I dont bother with BHR as we cant race the Vincent Comet there so I am dammed if I will bother to parade with them. and I have found that at the events like Kop Hill and Bicester they actually enjoy the noise of a straight through 2" and why not? [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Comet silencer
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