The Spares Company
Club Shop/Regalia
Parent Website
Contact Officials
Machine Registrar
Club Secretary
Membership Secretaries
MPH Editor and Forum Administrator.
Section Newsletters
Technical Databases
Photos
Home
What's new
Latest activity
Forums
New posts
What's new
New posts
Latest activity
Information
Bike Modifications
Machine Data Services
Manufacturers Manuals
Spare Parts Listings
Technical Diagrams
Whitakerpedia (Vincent Wiki)
The Club
MPH Material Archive
Flogger's Corner
Obituaries
VOC Sections
Local Sections
Local Section Newsletters
Miscellaneous
Club Assets
Club History
Club Rules
Machine Data Services
Meeting Documents
Miscellaneous
Essential Reading
Magazine/Newspaper Articles/Letters
Adverts and Sales Brochures
The Mighty Garage Videos
Bikes For Sale (Spares Company)
Log in
Register
What's new
New posts
Menu
Log in
Register
Install the app
Install
Home
Forums
Forums: Public Access
Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Norvin - Exhaust System
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Reply to thread
Message
<blockquote data-quote="Black Flash" data-source="post: 122628" data-attributes="member: 433"><p>My goldie silencer came from armours too. It was an off the shelf item at the time I bought it. At this time I did not know they will make one up with different design if you ask them to.</p><p>I inspected it with a torch light. </p><p>It has no wadding at all in it. It has a perforated tube going through it. The tube is cut in half in the middle of the silencer and the two ends welded together with an offset of half the inner diameter. So roughly a quarter of the exhaust fumes can go straight through, the rest dissipates through the perforations into the empty can and reenters again further to the end of the silencer again and out through the tailpipe. </p><p>I stuffed it with wire wool, put Harley decibel eaters in the back pipe, tried VW bug endpipes, all sorts of things and finally gave up. I couldn't find a way to tame the noise to an acceptable level without choking the engine. </p><p>Finally built a silencer myself with an integrated Helmholtz resonator. The engine noise with the bike stationary measured at 4000 rpm dropped from 110+dB to 84dB. Still the engine is louder when under load. But I can ride it two hours without the need of earplugs.</p></blockquote><p></p>
[QUOTE="Black Flash, post: 122628, member: 433"] My goldie silencer came from armours too. It was an off the shelf item at the time I bought it. At this time I did not know they will make one up with different design if you ask them to. I inspected it with a torch light. It has no wadding at all in it. It has a perforated tube going through it. The tube is cut in half in the middle of the silencer and the two ends welded together with an offset of half the inner diameter. So roughly a quarter of the exhaust fumes can go straight through, the rest dissipates through the perforations into the empty can and reenters again further to the end of the silencer again and out through the tailpipe. I stuffed it with wire wool, put Harley decibel eaters in the back pipe, tried VW bug endpipes, all sorts of things and finally gave up. I couldn't find a way to tame the noise to an acceptable level without choking the engine. Finally built a silencer myself with an integrated Helmholtz resonator. The engine noise with the bike stationary measured at 4000 rpm dropped from 110+dB to 84dB. Still the engine is louder when under load. But I can ride it two hours without the need of earplugs. [/QUOTE]
Insert quotes…
Verification
The Series 'A' Rapide was known as the '********' Nightmare?
Post reply
Home
Forums
Forums: Public Access
Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Norvin - Exhaust System
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.
Accept
Learn more…
Top