BritBike Forum logo
BritBike SponsorBritBike SponsorBritBike SponsorBritBike SponsorBritBike Sponsor SteadfastCyclesBritBike SponsorBritBike SponsorBritBike SponsorBritBike SponsorHepolite PistonsBritBike Sponsor
Upgrade to: Gold Membership | Premium Membership | Vendor Membership | Site Sponsor Membership
Member Spotlight
MikeG
MikeG
New Hampshier USA
Posts: 3,048
Joined: August 2001
ShoutChat Box
Comment Guidelines: Do post respectful and insightful comments. Don't flame, hate, spam.
Search eBay for motorcycle parts in following countries
Australia, Canada, France, Holland, Italy, United Kingdom, USA
Random Gallery photo
a word from..
Manuals on DVD (Shipping included)
Previous Thread
Next Thread
Print Thread
Rate Thread
Finding a baffle small enough
#771389 04/18/19 3:25 pm
Joined: Apr 2019
Posts: 15
Fraz Offline OP
Britbike forum member
OP Offline
Britbike forum member
Joined: Apr 2019
Posts: 15
I've got a BSA Thunderbolt hardtail with straight through pipes and I'm really struggling to find any baffles small enough here in the UK. The pipe is 30mm (1 3/16") wide does anyone have any ideas?
Thanks

Support Your #1 BritBike Forum!

Check out British motorcycles for sale: British Motorcycles on e-Bay UK, British motorcycles on e-Bay North America
Re: Finding a baffle small enough
Fraz #771408 04/18/19 5:34 pm
Joined: Dec 2004
Posts: 10,579
Likes: 19
Britbike forum member
Offline
Britbike forum member
Joined: Dec 2004
Posts: 10,579
Likes: 19
I had to stick the smallest one I could find on a lathe, could not get one to fit without modifying.

Re: Finding a baffle small enough
Fraz #771430 04/18/19 9:07 pm
Joined: Apr 2019
Posts: 15
Fraz Offline OP
Britbike forum member
OP Offline
Britbike forum member
Joined: Apr 2019
Posts: 15
Thanks kommando, smallest I can find is 35mm. How did you go about making it smaller?

Re: Finding a baffle small enough
Fraz #771465 04/19/19 6:31 am
Joined: May 2013
Posts: 6,648
Likes: 17
Britbike forum member
Offline
Britbike forum member
Joined: May 2013
Posts: 6,648
Likes: 17
Why are you running a 30mm pipe, the engine will end up getting choked up.


beerchug

(Display name changed for cyber security reasons)

Re: Finding a baffle small enough
Fraz #771470 04/19/19 9:58 am
Joined: Dec 2004
Posts: 10,579
Likes: 19
Britbike forum member
Offline
Britbike forum member
Joined: Dec 2004
Posts: 10,579
Likes: 19
Quote
How did you go about making it smaller?


Turned it down on the lathe, it was a lot smaller than 35mm, nearer 31mm. Found it on eBay but that was 8 years ago.

Re: Finding a baffle small enough
Allan G #771601 04/20/19 9:38 am
Joined: Apr 2019
Posts: 15
Fraz Offline OP
Britbike forum member
OP Offline
Britbike forum member
Joined: Apr 2019
Posts: 15
The guy I'd purchased the bike from had some pipes custom made for it. Eventually when I have the funds I will get some more made but at the moment I will have to run these

Re: Finding a baffle small enough
kommando #771602 04/20/19 9:39 am
Joined: Apr 2019
Posts: 15
Fraz Offline OP
Britbike forum member
OP Offline
Britbike forum member
Joined: Apr 2019
Posts: 15
Originally Posted by kommando
Quote
How did you go about making it smaller?


Turned it down on the lathe, it was a lot smaller than 35mm, nearer 31mm. Found it on ebay but that was 8 years ago.


Thanks, I've yet to see some that small but will keep an eye out

Re: Finding a baffle small enough
Fraz #771969 04/25/19 7:35 pm
Joined: Aug 2015
Posts: 1,555
Likes: 8
Britbike forum member
Online Content
Britbike forum member
Joined: Aug 2015
Posts: 1,555
Likes: 8
To silence, the exhaust gasses need to expand and dissipate the sound waves.
The 2 main types of silencer use either a perforated tube inside a box, usually surrounded by some form of wadding or a series of chambers connected by tubes.
Just putting a baffle in the end of a header pipe may reduce the noise slightly but will hurt performance very badly


BSA B31 500 "Stargazer"
Greeves 200 "Blue Meanie"
Greeves 350
Greeves 360
Suzuki GSX1100 EFE "Sorcerers Apprentice"
GM500 sprint/LSR bike "Deofol"
Jawa 500 "Llareggub"
Aprilia RSV Mille "Lo Stregone"
'35 & '36 OK Supreme
Kawasaki ZZR1400 "Kuro no senshi"

Moderated by  GrandPaul 

Link Copied to Clipboard
Home | Sponsors | Newsletter | Regalia | Calendar | Bike Project | BritBike Museum | Spiders Cartoons | DVD- Manuals & Parts books
Upgrade to: Gold Membership | Premium Membership | Vendor Membership | Site Sponsor Membership
Powered by UBB.threads™ PHP Forum Software 7.7.4