Can I use loft insulation in my exhaust?

[KentishS2]

Can I use any loft insulation or only a certain type for silencing in my exhaust?

Is it sufficient to test it using just a match for a combustability test?

[Andy Eccles]

I don't know, but exhaust packing material is cheap anyway...

www.aa16.co.uk/a16exhaustparts.htm

[KITT]

You're supposed to use proper exhaust material called Basalt silencer wadding. You can get it here:

www.merlinmotorsport.co.uk/catalogue/exhausts.htm

However, I know of a Tiger owner who attends trackdays and uses loft insulation to quieten his noise down. Hasn't caught fire yet, although his wife is wondering why their heating bill has gone up this year

[stooz]

ive been told its the same thing, but I havent tried it.

[KentishS2]

I'll get the blow torch out tonight and let you all know tomorrow.

I'll remove it from the loft first ....just in case

[uldis]

I tried it, and it lasts only for a few hours.
Then it all melts into small glass pebbles.

See, that glass thermal rating is not very high, it melts...

You have to go for the proper stuff, I'm afraid.

[rsvmilly]

Glass fibre quilt will melt but if you use Rockwool it shouldn't*

* Just don't hold me responsible!

[19560]

rsvmilly said:

Glass fibre quilt will melt but if you use Rockwool it shouldn't* * Just don't hold me responsible!

Sounds correct... www.rockwool.com/sw5129.asp
You can even get a video
"Rockwool stone wool withstands more than 1000°C
The major difference between stone wool and other types of insulation materials is that Rockwool stone wool withstands temperatures of more than 1000°C. Glass wool insulation will melt at a lower temperature (600°C). Most foamed plastics will decompose, burn and/or disappear at temperatures below 300°C. Rockwool insulated constructions will thus have a higher fire resistance than constructions insulated with any of the other materials. This can provide vital extra time for people to escape the fire, and for fire fighters to extinguish the fire - before the building becomes completely engulfed in flames and collapses.


To order a video with a fire resistance demonstration of Rockwool stone wool and glass wool, click here."

[Alicatt]

only for a short while, the fibres are shorter in the loft insulation and it will blow out the end of the exhaust. I tried it with a Yamaha IT465 and it would only last a few hours at most.

[busta]

Brillo pads work although you would need an awful lot to stuff a silencer. I used a couple in a straight through 2" exhaust just to take the raspiness out of the exhaust note.

Bernie

[Trooper2]

busta said:

Brillo pads work although you would need an awful lot to stuff a silencer. I used a couple in a straight through 2" exhaust just to take the raspiness out of the exhaust note. Bernie

Make sure you don't use the ones with soap on them or you might drive down the road blowing bubbles!

Trooper2.

[19560]

Trooper2 said:

busta said: Brillo pads work Make sure you don't use the ones with soap on them or you might drive down the road blowing bubbles!

Only if you're running a steam engine.

[V6GTO]

I used Rockwool for years when I used to race Motocross.

Martin.

[grandadboats]

19560 said:

Trooper2 said: busta said: Brillo pads work Make sure you don't use the ones with soap on them or you might drive down the road blowing bubbles! Only if you're running a steam engine.

Or your head gaskets blown!

[Trooper2]

19560 said:

Trooper2 said: busta said: Brillo pads work Make sure you don't use the ones with soap on them or you might drive down the road blowing bubbles! Only if you're running a steam engine.

Or it's humid.

[KentishS2]

Does anyone know where I can buy the proper exhaust wadding in not too huge a quantity with a quick delivery?

[bertie]

KITT said:

You can get it here: www.merlinmotorsport.co.uk/catalogue/exhausts.htm

Is this too much then?

[Vixpy1]

Does anyone know a good supplier for rockwooll?

[cosmoschick]

KentishS2 said:

I'll get the blow torch out tonight and let you all know tomorrow.

I take it your original idea wasn't a huge success...

KentishS2 said:

Does anyone know where I can buy the proper exhaust wadding in not too huge a quantity with a quick delivery?

[remal]

KentishS2 said:

Can I use any loft insulation or only a certain type for silencing in my exhaust? Is it sufficient to test it using just a match for a combustability test?

One Tiger Owner I know uses Loft insulation in his repack exhaust on his Tiger Cat and has no problems with sound tests on trackdays. usually quieter than my Merlin Motorsport exhaust packing I use.

Regards