exhaust silencing

[sowts]

how do i go about reducing the dbs out of my exhaust

need to do this in a hurry (only got 8 days before i go away )

and need to do this as cheap as possible  

took the end off my can (dont know what make it is)and the packing dont look to bad from what i can see poking out the end

can i ram this down with a stick or such like and  stuff a load more in or does it have to rapped around nice and neat

just tested it 93dbs at idle (with my new nosie meter from maplins could this be faulty)

and 108 at 2/3s rev range

needs to be 95dbs

help !!!!!!!!

[carpetstu]

Sowts I have some packing somewhere. if you want to try some I can see about finding it!

[sowts]

cheers stu

but do i just ram it in or do i need to get the old stuff out then ram it in or do i do some thing else

[Guest]

if its full of packing and you stuff it full to the gunnels and tighter you will make your exhaust noisier .

you need to have a nice blanket of wadding wrapped around the perforated tube not too tightly thus letting gasses escape into the wadding rather than straight threw and out the end .

what size is your silencer?

and on what engine ?

[carpetstu]

cheers stu

but do i just ram it in or do i need to get the old stuff out then ram it in or do i do some thing else

Couldn't swear to it but as far as I know the more you put in the quieter it should be.

[sowts]

600mm long

500mm girth

3in pipe in (and on looking inside earlyer 3in pipe through the middle) 3in out  

on a 1800 zetec with jenvy throttle boddies

[Big R]

It does seem a bit short to meet current noise limits and a 3" pipe is enormous for a 1800 zetec and you only have ~1.5" wadding wrapped around it .... the wadding needs to be packed correctly - just pushing more in could make things worse....

[carpetstu]

Good job I didn't claim to be an expert on the subject then ay? PMSL    

[Guest]

600mm long

500mm girth

3in pipe in (and on looking inside earlyer 3in pipe through the middle) 3in out  

on a 1800 zetec with jenvy throttle boddies

3 inch in and out will be your issue , you sure thats what it is as thats huge and going to sound loud even if packed right ....

If i remeber correctly 250bhp to 280 bhp has a 2.75 inch collector 2.5 inch exit , a 3 inch collector is designed for 300bhp plus

up to 250 your on a 2.5 inch collector with a 2 and a quater outlet.

[sowts]

how about i restrict the size into the can would this make a difference

(i was thinking of reducing after the 4 in to 1 existing part westfield standard fitment)

[Guest]

how about i restrict the size into the can would this make a difference

(i was thinking of reducing after the 4 in to 1 existing part westfield standard fitment)

it would , and actually you can buy an insert that goes inline that will reduce noise and reduce inlet .

insert into the inlet end

JETU937630 JETEX 3" DECIBEL INSERT 300mm LONG £19.57

from burton power www.burtonpower.com

[sowts]

will be in the shed in the morning with tig welder and grinder making one of these

also just been talking with a a mate of mine and he said to make some thing that bikes use called a spark arrester and tac that in to the end of the exhaust any thoughts