DIY muffler

**imdying** · 8th May 2007, 12:17

Yeah, this is a pretty small can, and thus pretty high internal pressure... not sure I want to risk carbon fibre (or use as much as would be required).

**vifferman** · 8th May 2007, 12:39

Originally Posted by imdying

Yeah, this is a pretty small can, and thus pretty high internal pressure... not sure I want to risk carbon fibre (or use as much as would be required).

You could just skin it with Cf, and have something more robust inside, like an aluminium or s/steel tube.

**jonbuoy** · 8th May 2007, 12:57

My old VTR pipes were stainless caps with alloy wrap - never saw any corrosion though its never been on a salted road. I think you can buy muffler packing from supercheap, or an exhaust shop - they might have some of that universal baffle pipe as well? I'm thinking of making an ally pipe myself, Ulrich have some extrusions and pipes. I've found it pretty hard to bend even 3mm ally plate in big sheets so far - it might not be so bad of you had a wooden mold to form it around. Allys not cheap either.

**imdying** · 8th May 2007, 12:59

Originally Posted by jonbuoy

I think you can buy muffler packing from supercheap,

it might not be so bad of you had a wooden mold to form it around. Allys not cheap either.

Cheers for that. Easiest way to bend the sheet is with a roller

**classic zed** · 8th May 2007, 13:29

Originally Posted by imdying

It's a vacuum pump. That it pumps air is neither here nor there, the end result is a vacuum. A bicycle tyre pump doesn't pump bicycle tyres...

No but it pumps air into them

**imdying** · 8th May 2007, 13:36

Into, out of, and?

**classic zed** · 8th May 2007, 13:55

Originally Posted by imdying

Into, out of, and?

Into the tube

Out of The air pump

And therefore creating positive air pressure withing the inner tube

**imdying** · 8th May 2007, 14:08

So what you're saying is that it should be called an 'exhaust sucker'?

**Thenaughtebucket** · 8th May 2007, 18:34

Its merely a pump that creates a vacuum, therefore its a vacuum pump?? No??
anyways silly arguement.

I really dont think you will need asmuch carbon fibre as you think, ive made sum light bodywork that is pretty much just one laye of 200gm, the fact that the can is kinda small and the fact that is supported at each will mean that just due to its geometry it will be strong.

unless ofcourse they use structural exhausts aswell as engines these days???

**imdying** · 8th May 2007, 19:20

Originally Posted by Thenaughtebucket

unless ofcourse they use structural exhausts aswell as engines these days???

Yikes! Don't get me started on that idea!

**worm** · 9th May 2007, 22:33

carbon fibre will hold up fine. The issue with the exhaust pulse will be the movents between the end caps and the carbon sleeve.
I made a carbon exhaust sleeve for my R6 recently, heat was fine. I just used a Nuplex ployester resin. (but would recomend using a high temp vynalester). The resin will need post curing when product is finished. but just taking the bike for a light ride will do this.
U could use 2 layers of carbon double bias. and 1 layer of twill. As double bias is cheaper.
good luck.

**sAsLEX** · 10th May 2007, 02:20

Originally Posted by classic zed

Into the tube

Out of The air pump

And therefore creating positive air pressure withing the inner tube

http://en.wikipedia.org/wiki/Vacuum_pump

**degrom** · 28th September 2007, 14:24

Originally Posted by imdying

Yikes! Don't get me started on that idea!

On the topic of exhausts... How do they round the tips on exhaust pipes?

http://www.neptunemufflers.co.nz/textureb.jpg

(Not even sure what you call it when you do that to a tube? Or what tool you use to do it? (Have tried Google with no luck...))