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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
poor quality repop silencers
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<blockquote data-quote="vibrac" data-source="post: 109015" data-attributes="member: 60"><p>I have a decibel meter since for racing and parading you have to be under 105Db at most circuits. (annoyingly the one just up the road is 85Db -drive by! I dont think a Firefly would pass that.</p><p>Anyway on the Flash its difficult to get a small silencer that looks unobtrusive on a two inch pipe and racing cams working on the basis that thin walls in houses let noise through, I got some 3" internal alloy tube with 1/4" wall and turned two end caps also with 1/4" walls and 2" inlets outlets and fitted a two inch perforated tube (car exhaust component part) flared at inlet to take the main pipe. This runs through the body with the 1/2" annular space filled with packing. result? heavy, but all bolted up it gives 105-6 Db and is small enough not to interfere with the paddock stand. In more enlightened surroundings (like the flywheel festival) I have an simple open pipe extension</p></blockquote><p></p>
[QUOTE="vibrac, post: 109015, member: 60"] I have a decibel meter since for racing and parading you have to be under 105Db at most circuits. (annoyingly the one just up the road is 85Db -drive by! I dont think a Firefly would pass that. Anyway on the Flash its difficult to get a small silencer that looks unobtrusive on a two inch pipe and racing cams working on the basis that thin walls in houses let noise through, I got some 3" internal alloy tube with 1/4" wall and turned two end caps also with 1/4" walls and 2" inlets outlets and fitted a two inch perforated tube (car exhaust component part) flared at inlet to take the main pipe. This runs through the body with the 1/2" annular space filled with packing. result? heavy, but all bolted up it gives 105-6 Db and is small enough not to interfere with the paddock stand. In more enlightened surroundings (like the flywheel festival) I have an simple open pipe extension [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
poor quality repop silencers
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