Self Build Silencer

[Johnnybizzle]

Hi all,

Had my roadster on the road for bout a year with the noisiest cbr1000 engine ever. managed to get it through IVA with a pack of wire wool up the exhaust to read 97db without its stupidly noisey with plenty of pops and bangs great for a bit after an hour or so gets abit tiresome, an i wont beable to get on any trackdays or hill climb as it is.

Going to build a new silencer 600mm long and bigger diameter, daft question but will it need packing, dont really want to cut the one i have into pieces to find out whats inside?

Regards Jon

[baz-r]

there is a trick to droping db's for iva or trackdays by using a stepped down bit of pipe in the exhaust with the thin end pointing to the engine so there is a gap between the outer pipe and the step down pipe.
somtimes called db killers

also im pritty sure a motorbike track endro guy told me if you over pack your noise goes up as its to do with damping waves of pressure

[vmax1974]

Or for track days you could clamp a bean tin with a load of holes in it on the end of the exhaust that shuts them up a bit

[Johnnybizzle]

Thanks guys for the advice,

the silencer i have is a basic Robin Hood silencer at low revs sounds like an Impreza , 6-11k revs may aswell not be there.

My 600 bandit race can is filled with what looks like wire wool, would this work as good as some wadding off ebay?

[ozzy1]

Try these guys theyre pretty good

http://www.cbsonline.co.uk/category/Exhaust_System,b.html

[AshG]

ACOUSTAFIL is the best stuff i have found. have a chat with paul gooderham he made my silencer and it is a serious piece of art and very quiet compared to my old one.

http://www.paulgooderham.co.uk/

tell him ashg sent you his way and im sure he will sort you out something to your requirements for less money than most places.